The Experts below are selected from a list of 1848 Experts worldwide ranked by ideXlab platform
Amin Eisazadeh - One of the best experts on this subject based on the ideXlab platform.
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Physicochemical behavior of tropical Laterite Soil stabilized with non-traditional additive
Acta Geotechnica, 2016Co-Authors: Nima Latifi, Aminaton Marto, Amin EisazadehAbstract:Non-traditional Soil stabilizers are widely used for treating weak materials. These additives are cost- and time-effective alternatives to more traditional materials such as lime and cement. It has been well established that the treatment of natural Soil with chemical additives will gradually affect the size, shape, and arrangement of Soil particles. Furthermore, the degree of improvement is dependent on the quantity and the pattern of new products formed on and around the Soil particles. In this paper, unconfined compressive strength (UCS) test was performed as an index of Soil improvement on mix designs treated with calcium-based powder stabilizer (SH-85). The time-dependent changes in shear strength parameter and compressibility behavior of treated Soil were also studied using standard direct shear and one-dimensional consolidation tests. In order to better understand the shape and surface area of treated particles, FESEM, N_2-BET, and particle size distribution analysis were performed on Soil-stabilizer matrix. From engineering standpoint, the UCS results showed that the degree of improvement for SH-85-stabilized Laterite Soil was roughly five times stronger than the untreated Soil at the early stages of curing (7-day period). Also, a significant increase in the compressibility resistance of treated samples with curing time was observed. Based on the results, less porous and denser Soil fabric was seen on the surface of clay particles. FESEM images of the treated mix designs showed the formation of white lumps in the Soil fabric with the cementitious gel filling the pores in the Soil structure.
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analysis of strength development in non traditional liquid additive stabilized Laterite Soil from macro and micro structural considerations
Environmental Earth Sciences, 2015Co-Authors: Nima Latifi, Aminaton Marto, Amin EisazadehAbstract:The stabilization of Soils with additives is a chemically modified method that can be used to improve Soils with weak engineering properties. It has been well established that the size, shape, and arrangement of Soil particles will affect the treatment process of natural Soil with stabilizers. Also, the degree of enhancement is dependent on the morphology of the new formed products that bond the Soil particles together. In this paper, unconfined compressive strength (UCS) test was performed as an index of Soil improvement on liquid-stabilized (TX-85) mix designs. The time-dependent change in shear properties and compressibility behavior of treated Soil was also studied using standard direct shear and consolidation tests. To better understand the structure and surface morphology of treated particles, FESEM, N2-BET and particle size distribution analysis were performed on Soil-stabilizer matrix. From engineering point of view, the UCS results indicated that the degree of improvement for TX-85-stabilized Laterite Soil was approximately four times greater than the natural Soil in a 7-day curing time period. Also, increased compressibility resistance of treated samples with curing time was evident. Based on the results, it was found that the stabilization process modifies the porous network of Laterite Soil. In addition, new white layers of reaction products were formed on the surface of clay particles.
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Effect of Non-Traditional Additives on Engineering and Microstructural Characteristics of Laterite Soil
Arabian Journal for Science and Engineering, 2014Co-Authors: Aminaton Marto, Nima Latifi, Amin EisazadehAbstract:The stabilization of Soils with additives is a chemical method that can be used to improve Soils with lowengineering properties. The stabilizing mechanisms of TX-85 and SH-85 additives are not fully understood, and their proprietary chemical composition makes it very difficult to evaluate the stabilizing mechanisms and predict their performance. The objective of this study was to investigate the macro- and microstructural properties related to tropical Laterite Soil mixed with the specified non-traditional Soil additives. The tests carried out, i.e., compaction and unconfined compression strength, were used to assess the engineering and shear properties of the stabilized Laterite Soil, and the physicochemical changes were monitored via field-emission scanning electron microscopy (FESEM) and thermal gravity analysis. Based on the results, it was found that both additives can decrease the dry density and increase the Laterite Soil strength approximately fourfold in comparison with the natural Soil. FESEM results showed that the porosity of untreated Soil was filled by the new cementitious products. Also, it was found that the treatment of Laterite had a marginal impact on the thermal characteristics of the Soil.
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strength behavior and microstructural characteristics of tropical Laterite Soil treated with sodium silicate based liquid stabilizer
Environmental Earth Sciences, 2014Co-Authors: Nima Latifi, Amin Eisazadeh, Aminaton MartoAbstract:Although the effects of nontraditional stabilizers on the geotechnical properties of tropical Soils has been the issue of investigation in recent years, the micro-structural characteristics of nontraditional Soil additives and in particular selected additive (TX-85) have not been fully studied. Nontraditional Soil stabilization additives are widely used for stabilizing marginal materials. These additives are low-cost alternatives to traditional construction materials and have different compositions. They also differ from one another while interacting with Soil. In line with that, it was the objective of this research to investigate the strength properties and physicochemical mechanisms related to tropical Laterite Soil mixed with the liquid stabilizer TX-85. Macro-structure study, i.e., compaction, and unconfined compression strength test were used to assess the engineering and shear properties of the stabilized Laterite Soil. In addition, the possible mechanisms that contributed to the stabilization process were discussed using various spectroscopic and microscopic techniques such as X-ray diffractometry (XRD), energy-dispersive X-ray spectrometry, scanning electron microscopy, and Fourier transform infrared spectroscopy. From engineering point of view, the results indicated that the strength of TX-85 stabilized Laterite Soil improved significantly. The degree of improvement was approximately four times stronger than natural Soil after a 7-day curing period. The XRD showed no crystalline products (gel form). Moreover, weathering effects were obvious in TX-85 treated samples in most of clay minerals’ peak intensities. These effects were reduced especially for kaolinite mineral inside the Soil with curing time.
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structural characteristics of Laterite Soil treated by sh 85 and tx 85 non traditional stabilizers
The electronic journal of geotechnical engineering, 2013Co-Authors: Nima Latifi, Aminaton Marto, Amin EisazadehAbstract:Soil stabilization is the process of improving the physical and engineering properties of a Soil to obtain some predetermined targets. Nowadays, among the different methods of Soil improvement, using chemical additives for Soil stabilization in order to increase Soil strength parameters and loading capacity getting more attention. The chemical stabilization technology is a chemically modified method that can stabilize or reinforce those Soils with weak engineering properties. Various types of chemical additives (in liquid and powder form) are actively marketed by a number of companies. The stabilizing mechanisms of these products are not fully understood, and their proprietary chemical composition makes it very difficult to evaluate the stabilizing mechanisms and predict their performance. This research was carried out in an attempt to identify the time-dependent reactions between Laterite Soil and two type of nontraditional additives (TX-85, SH-85) by macroand micro structure study. The employed tests were unconfined compression strength (UCS), Atterberg limits, pH, and scanning electron microscopy (SEM). Based on the results it was found that the both of additives can increase the Laterite Soil strength, as the increment for SH-85 and TX85 is around 5 and 4 times more than untreated Soil respectively, which is gained in first 7 days of curing. Also the results of SEM showed that the porosity of untreated Soil filled by the new component, so the treatment with SH-85 and TX-85 contributed to denser Soil fabric.
Nima Latifi - One of the best experts on this subject based on the ideXlab platform.
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Physicochemical behavior of tropical Laterite Soil stabilized with non-traditional additive
Acta Geotechnica, 2016Co-Authors: Nima Latifi, Aminaton Marto, Amin EisazadehAbstract:Non-traditional Soil stabilizers are widely used for treating weak materials. These additives are cost- and time-effective alternatives to more traditional materials such as lime and cement. It has been well established that the treatment of natural Soil with chemical additives will gradually affect the size, shape, and arrangement of Soil particles. Furthermore, the degree of improvement is dependent on the quantity and the pattern of new products formed on and around the Soil particles. In this paper, unconfined compressive strength (UCS) test was performed as an index of Soil improvement on mix designs treated with calcium-based powder stabilizer (SH-85). The time-dependent changes in shear strength parameter and compressibility behavior of treated Soil were also studied using standard direct shear and one-dimensional consolidation tests. In order to better understand the shape and surface area of treated particles, FESEM, N_2-BET, and particle size distribution analysis were performed on Soil-stabilizer matrix. From engineering standpoint, the UCS results showed that the degree of improvement for SH-85-stabilized Laterite Soil was roughly five times stronger than the untreated Soil at the early stages of curing (7-day period). Also, a significant increase in the compressibility resistance of treated samples with curing time was observed. Based on the results, less porous and denser Soil fabric was seen on the surface of clay particles. FESEM images of the treated mix designs showed the formation of white lumps in the Soil fabric with the cementitious gel filling the pores in the Soil structure.
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analysis of strength development in non traditional liquid additive stabilized Laterite Soil from macro and micro structural considerations
Environmental Earth Sciences, 2015Co-Authors: Nima Latifi, Aminaton Marto, Amin EisazadehAbstract:The stabilization of Soils with additives is a chemically modified method that can be used to improve Soils with weak engineering properties. It has been well established that the size, shape, and arrangement of Soil particles will affect the treatment process of natural Soil with stabilizers. Also, the degree of enhancement is dependent on the morphology of the new formed products that bond the Soil particles together. In this paper, unconfined compressive strength (UCS) test was performed as an index of Soil improvement on liquid-stabilized (TX-85) mix designs. The time-dependent change in shear properties and compressibility behavior of treated Soil was also studied using standard direct shear and consolidation tests. To better understand the structure and surface morphology of treated particles, FESEM, N2-BET and particle size distribution analysis were performed on Soil-stabilizer matrix. From engineering point of view, the UCS results indicated that the degree of improvement for TX-85-stabilized Laterite Soil was approximately four times greater than the natural Soil in a 7-day curing time period. Also, increased compressibility resistance of treated samples with curing time was evident. Based on the results, it was found that the stabilization process modifies the porous network of Laterite Soil. In addition, new white layers of reaction products were formed on the surface of clay particles.
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Effect of Non-Traditional Additives on Engineering and Microstructural Characteristics of Laterite Soil
Arabian Journal for Science and Engineering, 2014Co-Authors: Aminaton Marto, Nima Latifi, Amin EisazadehAbstract:The stabilization of Soils with additives is a chemical method that can be used to improve Soils with lowengineering properties. The stabilizing mechanisms of TX-85 and SH-85 additives are not fully understood, and their proprietary chemical composition makes it very difficult to evaluate the stabilizing mechanisms and predict their performance. The objective of this study was to investigate the macro- and microstructural properties related to tropical Laterite Soil mixed with the specified non-traditional Soil additives. The tests carried out, i.e., compaction and unconfined compression strength, were used to assess the engineering and shear properties of the stabilized Laterite Soil, and the physicochemical changes were monitored via field-emission scanning electron microscopy (FESEM) and thermal gravity analysis. Based on the results, it was found that both additives can decrease the dry density and increase the Laterite Soil strength approximately fourfold in comparison with the natural Soil. FESEM results showed that the porosity of untreated Soil was filled by the new cementitious products. Also, it was found that the treatment of Laterite had a marginal impact on the thermal characteristics of the Soil.
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strength behavior and microstructural characteristics of tropical Laterite Soil treated with sodium silicate based liquid stabilizer
Environmental Earth Sciences, 2014Co-Authors: Nima Latifi, Amin Eisazadeh, Aminaton MartoAbstract:Although the effects of nontraditional stabilizers on the geotechnical properties of tropical Soils has been the issue of investigation in recent years, the micro-structural characteristics of nontraditional Soil additives and in particular selected additive (TX-85) have not been fully studied. Nontraditional Soil stabilization additives are widely used for stabilizing marginal materials. These additives are low-cost alternatives to traditional construction materials and have different compositions. They also differ from one another while interacting with Soil. In line with that, it was the objective of this research to investigate the strength properties and physicochemical mechanisms related to tropical Laterite Soil mixed with the liquid stabilizer TX-85. Macro-structure study, i.e., compaction, and unconfined compression strength test were used to assess the engineering and shear properties of the stabilized Laterite Soil. In addition, the possible mechanisms that contributed to the stabilization process were discussed using various spectroscopic and microscopic techniques such as X-ray diffractometry (XRD), energy-dispersive X-ray spectrometry, scanning electron microscopy, and Fourier transform infrared spectroscopy. From engineering point of view, the results indicated that the strength of TX-85 stabilized Laterite Soil improved significantly. The degree of improvement was approximately four times stronger than natural Soil after a 7-day curing period. The XRD showed no crystalline products (gel form). Moreover, weathering effects were obvious in TX-85 treated samples in most of clay minerals’ peak intensities. These effects were reduced especially for kaolinite mineral inside the Soil with curing time.
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structural characteristics of Laterite Soil treated by sh 85 and tx 85 non traditional stabilizers
The electronic journal of geotechnical engineering, 2013Co-Authors: Nima Latifi, Aminaton Marto, Amin EisazadehAbstract:Soil stabilization is the process of improving the physical and engineering properties of a Soil to obtain some predetermined targets. Nowadays, among the different methods of Soil improvement, using chemical additives for Soil stabilization in order to increase Soil strength parameters and loading capacity getting more attention. The chemical stabilization technology is a chemically modified method that can stabilize or reinforce those Soils with weak engineering properties. Various types of chemical additives (in liquid and powder form) are actively marketed by a number of companies. The stabilizing mechanisms of these products are not fully understood, and their proprietary chemical composition makes it very difficult to evaluate the stabilizing mechanisms and predict their performance. This research was carried out in an attempt to identify the time-dependent reactions between Laterite Soil and two type of nontraditional additives (TX-85, SH-85) by macroand micro structure study. The employed tests were unconfined compression strength (UCS), Atterberg limits, pH, and scanning electron microscopy (SEM). Based on the results it was found that the both of additives can increase the Laterite Soil strength, as the increment for SH-85 and TX85 is around 5 and 4 times more than untreated Soil respectively, which is gained in first 7 days of curing. Also the results of SEM showed that the porosity of untreated Soil filled by the new component, so the treatment with SH-85 and TX-85 contributed to denser Soil fabric.
Aminaton Marto - One of the best experts on this subject based on the ideXlab platform.
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Physicochemical behavior of tropical Laterite Soil stabilized with non-traditional additive
Acta Geotechnica, 2016Co-Authors: Nima Latifi, Aminaton Marto, Amin EisazadehAbstract:Non-traditional Soil stabilizers are widely used for treating weak materials. These additives are cost- and time-effective alternatives to more traditional materials such as lime and cement. It has been well established that the treatment of natural Soil with chemical additives will gradually affect the size, shape, and arrangement of Soil particles. Furthermore, the degree of improvement is dependent on the quantity and the pattern of new products formed on and around the Soil particles. In this paper, unconfined compressive strength (UCS) test was performed as an index of Soil improvement on mix designs treated with calcium-based powder stabilizer (SH-85). The time-dependent changes in shear strength parameter and compressibility behavior of treated Soil were also studied using standard direct shear and one-dimensional consolidation tests. In order to better understand the shape and surface area of treated particles, FESEM, N_2-BET, and particle size distribution analysis were performed on Soil-stabilizer matrix. From engineering standpoint, the UCS results showed that the degree of improvement for SH-85-stabilized Laterite Soil was roughly five times stronger than the untreated Soil at the early stages of curing (7-day period). Also, a significant increase in the compressibility resistance of treated samples with curing time was observed. Based on the results, less porous and denser Soil fabric was seen on the surface of clay particles. FESEM images of the treated mix designs showed the formation of white lumps in the Soil fabric with the cementitious gel filling the pores in the Soil structure.
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analysis of strength development in non traditional liquid additive stabilized Laterite Soil from macro and micro structural considerations
Environmental Earth Sciences, 2015Co-Authors: Nima Latifi, Aminaton Marto, Amin EisazadehAbstract:The stabilization of Soils with additives is a chemically modified method that can be used to improve Soils with weak engineering properties. It has been well established that the size, shape, and arrangement of Soil particles will affect the treatment process of natural Soil with stabilizers. Also, the degree of enhancement is dependent on the morphology of the new formed products that bond the Soil particles together. In this paper, unconfined compressive strength (UCS) test was performed as an index of Soil improvement on liquid-stabilized (TX-85) mix designs. The time-dependent change in shear properties and compressibility behavior of treated Soil was also studied using standard direct shear and consolidation tests. To better understand the structure and surface morphology of treated particles, FESEM, N2-BET and particle size distribution analysis were performed on Soil-stabilizer matrix. From engineering point of view, the UCS results indicated that the degree of improvement for TX-85-stabilized Laterite Soil was approximately four times greater than the natural Soil in a 7-day curing time period. Also, increased compressibility resistance of treated samples with curing time was evident. Based on the results, it was found that the stabilization process modifies the porous network of Laterite Soil. In addition, new white layers of reaction products were formed on the surface of clay particles.
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Effect of Non-Traditional Additives on Engineering and Microstructural Characteristics of Laterite Soil
Arabian Journal for Science and Engineering, 2014Co-Authors: Aminaton Marto, Nima Latifi, Amin EisazadehAbstract:The stabilization of Soils with additives is a chemical method that can be used to improve Soils with lowengineering properties. The stabilizing mechanisms of TX-85 and SH-85 additives are not fully understood, and their proprietary chemical composition makes it very difficult to evaluate the stabilizing mechanisms and predict their performance. The objective of this study was to investigate the macro- and microstructural properties related to tropical Laterite Soil mixed with the specified non-traditional Soil additives. The tests carried out, i.e., compaction and unconfined compression strength, were used to assess the engineering and shear properties of the stabilized Laterite Soil, and the physicochemical changes were monitored via field-emission scanning electron microscopy (FESEM) and thermal gravity analysis. Based on the results, it was found that both additives can decrease the dry density and increase the Laterite Soil strength approximately fourfold in comparison with the natural Soil. FESEM results showed that the porosity of untreated Soil was filled by the new cementitious products. Also, it was found that the treatment of Laterite had a marginal impact on the thermal characteristics of the Soil.
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strength behavior and microstructural characteristics of tropical Laterite Soil treated with sodium silicate based liquid stabilizer
Environmental Earth Sciences, 2014Co-Authors: Nima Latifi, Amin Eisazadeh, Aminaton MartoAbstract:Although the effects of nontraditional stabilizers on the geotechnical properties of tropical Soils has been the issue of investigation in recent years, the micro-structural characteristics of nontraditional Soil additives and in particular selected additive (TX-85) have not been fully studied. Nontraditional Soil stabilization additives are widely used for stabilizing marginal materials. These additives are low-cost alternatives to traditional construction materials and have different compositions. They also differ from one another while interacting with Soil. In line with that, it was the objective of this research to investigate the strength properties and physicochemical mechanisms related to tropical Laterite Soil mixed with the liquid stabilizer TX-85. Macro-structure study, i.e., compaction, and unconfined compression strength test were used to assess the engineering and shear properties of the stabilized Laterite Soil. In addition, the possible mechanisms that contributed to the stabilization process were discussed using various spectroscopic and microscopic techniques such as X-ray diffractometry (XRD), energy-dispersive X-ray spectrometry, scanning electron microscopy, and Fourier transform infrared spectroscopy. From engineering point of view, the results indicated that the strength of TX-85 stabilized Laterite Soil improved significantly. The degree of improvement was approximately four times stronger than natural Soil after a 7-day curing period. The XRD showed no crystalline products (gel form). Moreover, weathering effects were obvious in TX-85 treated samples in most of clay minerals’ peak intensities. These effects were reduced especially for kaolinite mineral inside the Soil with curing time.
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structural characteristics of Laterite Soil treated by sh 85 and tx 85 non traditional stabilizers
The electronic journal of geotechnical engineering, 2013Co-Authors: Nima Latifi, Aminaton Marto, Amin EisazadehAbstract:Soil stabilization is the process of improving the physical and engineering properties of a Soil to obtain some predetermined targets. Nowadays, among the different methods of Soil improvement, using chemical additives for Soil stabilization in order to increase Soil strength parameters and loading capacity getting more attention. The chemical stabilization technology is a chemically modified method that can stabilize or reinforce those Soils with weak engineering properties. Various types of chemical additives (in liquid and powder form) are actively marketed by a number of companies. The stabilizing mechanisms of these products are not fully understood, and their proprietary chemical composition makes it very difficult to evaluate the stabilizing mechanisms and predict their performance. This research was carried out in an attempt to identify the time-dependent reactions between Laterite Soil and two type of nontraditional additives (TX-85, SH-85) by macroand micro structure study. The employed tests were unconfined compression strength (UCS), Atterberg limits, pH, and scanning electron microscopy (SEM). Based on the results it was found that the both of additives can increase the Laterite Soil strength, as the increment for SH-85 and TX85 is around 5 and 4 times more than untreated Soil respectively, which is gained in first 7 days of curing. Also the results of SEM showed that the porosity of untreated Soil filled by the new component, so the treatment with SH-85 and TX-85 contributed to denser Soil fabric.
Kamarudin Ahmad - One of the best experts on this subject based on the ideXlab platform.
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Computer Modeling Approach of Leachate Flow in Compacted Laterite Soil Liner
MATEC Web of Conferences, 2018Co-Authors: Yamusa Bello Yamusa, Kamarudin Ahmad, Noraliani Alias, Radzuan Sa’ari, Loke Kok FoongAbstract:The use of hydraulic barriers in sanitary landfills has become an impeccable means of protecting the groundwater system from leachate. A question to be asked is, can these barriers continue to impede the migration of leachate over a long period? This paper investigates the phenomenon of leachate migration in compacted Laterite Soil used as liner in sanitary landfills. An experiment was carried out using Laterite Soil compacted at optimum moisture content using Standard Proctor energy. Leachate was poured on the compacted Soil in an acrylic column and its migration was monitored using Digital Image Technique (DIT). The DIT capture photographic images at successive intervals of time which were fed through an image processing code to convert them to hue-saturation-intensity (HSI) format with the help of Surfer and Matlab computer softwares. Subsequently, PetraSim computer software was applied to predict the velocity behavior. The predicted velocity value shows that the Laterite Soil is compatible with the leachate and can be used as Soil liner. The outcome of this study would enable designers to use non-destructive method to monitor and predict leachate migration in compacted Soil liners to simulates leachate migration in waste containment applications.
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Laterite Soil Shear Strength Characteristics from the Use of the Standard Proctor and Compression Machine
Arid Zone Journal of Engineering Technology and Environment, 2018Co-Authors: Kamarudin Ahmad, Yamusa Bello Yamusa, M. H. Bin RoslyAbstract:This research investigates the influence of compaction methods on the shear strength characteristics of Laterite Soil. Comparison was made between static and dynamic methods of compaction in order to ascertain their similarity and a better optional method. The use of compression machine is a probabilistic method under uncertainties that is anticipated to produce similar results compared to the Standard Proctor compaction method due to machine wear and tear. Therefore, this research compares the shear strength of Laterite Soil compacted using Standard Proctor and that of compression machine. Basic indices and mechanical properties of Laterite Soil such as specific gravity, Atterberg limits, particle size distribution, compaction and shear strength properties were determined. The effects of moisture content, compactive methods and the rate of stress-strain on the unconfined shear strength were also studied. The maximum deviator stress for the Laterite Soil compacted at 26.4 % moisture content using standard proctor and compression machine compaction are 459.35 kPa and 219.5 kPa respectively. The results obtained from this study show that the Laterite Soil samples compacted using the Standard Proctor yielded higher unconfined compressive strength compared to those compacted using compression machine. Therefore, to obtain shear strength of Soils for field applications, the use of static compaction technique in laboratory requires careful investigation because it might not produce the required representative results.
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Sustainable Design of Compacted Laterite Soil Liner
GCEC 2017, 2018Co-Authors: Yamusa Bello Yamusa, Kamarudin Ahmad, Norhan Abd RahmanAbstract:Laterite Soil, as one of the major groups of tropical residual Soils, was investigated in application for engineered sanitary landfill liner. The Laterite Soil was used as a stand-alone material without any additives and subjected to different gradation to check its geotechnical potentiality as a sustainable material for liner. Specimens were prepared at different moulding water contents, i.e. optimum moisture content (OMC), dry of OMC and wet of OMC. Tests were carried out on natural Soil 30, 40 and 50% fine content by dry weight of Soil sample. The results showed that Laterite Soils should contain at least a minimum of 50% fine gradation to be used as liner. The outcome of this research is expected to serve as a sustainable guide to geotechnical/geo-environmental engineers in using Laterite Soil as a material in the construction of hydraulic barriers used for engineered sanitary landfill system in tropical countries of the world.
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Effects of fines content on hydraulic conductivity and morphology of Laterite Soil as hydraulic barrier
E3S Web of Conferences, 2018Co-Authors: Yamusa Bello Yamusa, Kamarudin Ahmad, Norhan Abd Rahman, Nor Zurairahetty Mohd. Yunus, Radzuan Sa’ariAbstract:Laterite Soil was investigated to find out the effects of fines content and to identify the micro-structural and molecular characteristics to evaluate its potentiality as a compacted Soil landfill liner material. Tests were carried out on natural Soil and reconstituted Soil by dry weight of Soil samples to determine the physical and engineering properties of the Soil. All tests were carried out on the samples by adopting the British Standard 1377:1990. The possible mechanisms that contributed to the clay mineralogy were analyzed using spectroscopic and microscopic techniques such as field emission scanning electron microscopy (FESEM), energy-dispersive X-ray (EDX) and X-ray diffractometry (XRD). The Laterite Soil was found to contain kaolinite as the major clay minerals. A minimum of 50% fines content of Laterite Soil met the required result for hydraulic barriers in waste containment facilities.
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HYDRAULIC CONDUCTIVITY AND VOLUMETRIC SHRINKAGE PROPERTIES REVIEW ON GRADATION EFFECT OF COMPACTED Laterite Soil LINER
2017Co-Authors: Yamusa Bello Yamusa, Kamarudin Ahmad, Norhan Abd RahmanAbstract:This paper reviews the effects of gradation on hydraulic conductivity and volumetric shrinkage properties of compacted Laterite Soil liner. The distribution of different grain sizes affects the engineering properties of Soil such as compressibility, swelling and shrinkage, shear strength, and hydraulic conductivity. It is observed that there are dissimilarities of values in Laterite Soils from various researches around tropical countries of the world in terms of hydraulic conductivity and volumetric shrinkage. Hydraulic conductivity varies from 4.36×10-3 m/s to 4.7×10-11 m/s and volumetric shrinkage of ≤ 4%relative to fine contents ranging from 1.3% to 69% and coarse contents ranging from 31% to 98.7%.Generally, there is no clear trend established for effects of gradation on hydraulic conductivity and volumetric shrinkage properties of compacted Laterite Soil liners. This is because Laterite Soils with less than 50% fines content might not be used as liner or hydraulic barriers because their hydraulic conductivities are less than the minimum requirement of 1 × 10-9 m/s. At times researchers usually left out volumetric shrinkage in their study, but field studies have shown that desiccation can induce severe cracking of unprotected Soil barriers. When fine grained Soils lose moisture they tend to shrink, which result to cracking that can adversely affect the engineering properties and performance of the Soils. The adversative influence includes reduced strength of the cracked Soils and increased hydraulic conductivity. It is expected that with logical understanding of the effects of gradation on hydraulic conductivity and volumetric shrinkage properties of compacted Laterite Soil it will serve as a guide in the design of hydraulic barriers for engineered sanitary landfills in tropical countries around the world.
Surapol Padungthon - One of the best experts on this subject based on the ideXlab platform.
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Role of Colocasia esculenta L. schott in arsenic removal by a pilot-scale constructed wetland filled with Laterite Soil
Elsevier, 2019Co-Authors: Vanlop Thathong, Netnapid Tantamsapya, Chatpet Yossapol, Chih-hsiang Liao, Wanpen Wirojanagud, Surapol PadungthonAbstract:The role of plant Colocasia esculenta L. schott (C. esculenta) in arsenic removal was investigated in a pilot-scale constructed wetland (PCW), which was filled with Laterite Soil (19.90–28.25% iron by weight). This PCW consists of 2 sets of flow systems in parallel, with C. esculenta planted at a density of 20 plants/m2 in one system and the other without any plants. The synthetic water containing arsenic concentration of 0.50 mg/l, with its pH controlled at 7.0 and influent flow at 1.5 m3/day. With C. esculenta, the arsenic in water decreased from 0.485 mg/l to 0.054 mg/l (89% removal), whereas, without C. esculenta, the arsenic decreased from 0.485 mg/l to 0.233 mg/l (52% removal). As for the fate of the influent arsenic, the C. esculenta was responsible for 65% of arsenic accumulation. Note that the arsenic was found mostly within the root zone depth (20–40 cm). It appears that such a high capacity of arsenic removal was enhanced both by the plants through rhizostabilization and by the iron-adsorbed process within the Laterite Soil bed. In addition, the arsenic removal was observed to increase along with the time from 30 to 90 days, and it reached to a maximum removal around 90 days, and then decreased after 122 days. Thus, the arsenic removal efficiency including mechanisms founded can then be applied in designing of constructed wetland for arsenic treatment from gold mine drainage with similar site/Soil characteristic. Keyword: Environmental scienc
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Role of Colocasia esculenta L. schott in arsenic removal by a pilot-scale constructed wetland filled with Laterite Soil
Heliyon, 2019Co-Authors: Vanlop Thathong, Netnapid Tantamsapya, Chatpet Yossapol, Chih-hsiang Liao, Wanpen Wirojanagud, Surapol PadungthonAbstract:Abstract The role of plant Colocasia esculenta L. schott (C. esculenta) in arsenic removal was investigated in a pilot-scale constructed wetland (PCW), which was filled with Laterite Soil (19.90–28.25% iron by weight). This PCW consists of 2 sets of flow systems in parallel, with C. esculenta planted at a density of 20 plants/m2 in one system and the other without any plants. The synthetic water containing arsenic concentration of 0.50 mg/l, with its pH controlled at 7.0 and influent flow at 1.5 m3/day. With C. esculenta, the arsenic in water decreased from 0.485 mg/l to 0.054 mg/l (89% removal), whereas, without C. esculenta, the arsenic decreased from 0.485 mg/l to 0.233 mg/l (52% removal). As for the fate of the influent arsenic, the C. esculenta was responsible for 65% of arsenic accumulation. Note that the arsenic was found mostly within the root zone depth (20–40 cm). It appears that such a high capacity of arsenic removal was enhanced both by the plants through rhizostabilization and by the iron-adsorbed process within the Laterite Soil bed. In addition, the arsenic removal was observed to increase along with the time from 30 to 90 days, and it reached to a maximum removal around 90 days, and then decreased after 122 days. Thus, the arsenic removal efficiency including mechanisms founded can then be applied in designing of constructed wetland for arsenic treatment from gold mine drainage with similar site/Soil characteristic.
