The Experts below are selected from a list of 768 Experts worldwide ranked by ideXlab platform

Li Piani T. - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic behaviour of adobe bricks in compression: The role of fibres and water content at various loading rates
    'Elsevier BV', 2020
    Co-Authors: Li Piani T., Weerheijm J., Peroni M., Koene L., Krabbenborg D., Solomos G., Sluys, Lambertus J.
    Abstract:

    This paper presents the results of an experimental research aimed at assessing the material performance of adobe bricks in compression for a wide range of induced strain rates, from statics to high velocity impact. Adobe connotes a traditional masonry whose bricks are made of sundried soil mixtures possibly reinforced with natural fibres and joined together using Mud Mortar. The inclusion of fibre and the presence of water in the mixture have a dominant effect on the mechanical performance of adobe bricks and masonry. Their influence on the dynamic behaviour of this material is quantified and interpreted in this study at high strain rates also with data produced through Hopkinson bar testing. Appropriate dynamic increase factors and constitutive equations for adobe materials in dynamics are also investigated. The paper presents the experimental campaign, shows the main results and offers qualitative and quantitative interpretations for the principal damage patterns observed.Applied MechanicsMaterials- Mechanics- Management & Desig

  • Experimental-numerical material characterization of adobe masonry: Tests and simulations on various types of earthen bricks and Mortar in statics and dynamics
    2019
    Co-Authors: Li Piani T.
    Abstract:

    Research in this thesis is aimed at comprehensively characterizing the mechanical performance of adobe components. Adobe is a traditional masonry made of sundried bricks and Mortar. Bricks are made of soil mixed with fibres and joined together by Mud Mortar. Adobe is largely spread in areas of the world prone to seismic risk or involved in military conflicts. Its low environmental impact attracts scientific attention also for sustainable applications in current building industry. Unfortunately, the material and structural properties of adobe are still hardly assessed, as a result of centuries of progressive abandonment of this building technology in western countries after introduction of modern building materials in the market. In this doctoral research, a combined experimental and numerical approach was followed. It has been aimed at fulfilling experimental data and knowledge gaps in the study of the main properties of this material. Experimental tests have been performed on bricks and Mortar characterized by different mineralogical compositions, fibre percentages and moisture content. Mechanical tests consisted of bending and compression tests. Tests in compression have been performed at different rates of deformation from statics to high velocity impact. Data derived from tests have constituted a solid dataset aimed at interpreting and modelling the mechanical performance of adobe. Experimental trends resulted in physical theories concerning the main features of the quasi brittle response of adobe. In particular, the role of fibres and water content in the mixture on the mechanical response of adobe bricks and Mortar has been addressed in this study in the static and dynamic regimes of the spectrum of strain rate induced loadings. The main mechanical parameters in compression and tension for adobe have been statistically determined from the static and dynamic tests. Mechanical properties and physical theories have been framed in several models that interpret the response of adobe for different applications. Constitutive models have been derived to address the uniaxial response in compression at different strain rates of adobes of different mineralogical composition and water contents. A finite element damage model has been developed to simulate the main failure modes specifically observed in earthen bricks at different loading conditions and rates, including high velocity impacts. The numerical study has been devoted at ensuring objectivity of analysis to the results of simulations performed using different mesh refinements of the geometrical model of the tested brick. Furthermore, engineering ballistic models that address the response of adobe walls to small caliber penetrations have been developed in this doctoral research. This thesis contains the description of the performed experiments, the analysis of data, the theoretical interpretations and the models developed for the material characterization of adobe masonry.Applied Mechanic

  • Experimental-numerical material characterization of adobe masonry: Tests and simulations on various types of earthen bricks and Mortar in statics and dynamics
    2019
    Co-Authors: Li Piani T.
    Abstract:

    Research in this thesis is aimed at comprehensively characterizing the mechanical performance of adobe components. Adobe is a traditional masonry made of sundried bricks and Mortar. Bricks are made of soil mixed with fibres and joined together by Mud Mortar. Adobe is largely spread in areas of the world prone to seismic risk or involved in military conflicts. Its low environmental impact attracts scientific attention also for sustainable applications in current building industry. Unfortunately, the material and structural properties of adobe are still hardly assessed, as a result of centuries of progressive abandonment of this building technology in western countries after introduction of modern building materials in the market. In this doctoral research, a combined experimental and numerical approach was followed. It has been aimed at fulfilling experimental data and knowledge gaps in the study of the main properties of this material. Experimental tests have been performed on bricks and Mortar characterized by different mineralogical compositions, fibre percentages and moisture content. Mechanical tests consisted of bending and compression tests. Tests in compression have been performed at different rates of deformation from statics to high velocity impact. Data derived from tests have constituted a solid dataset aimed at interpreting and modelling the mechanical performance of adobe. Experimental trends resulted in physical theories concerning the main features of the quasi brittle response of adobe. In particular, the role of fibres and water content in the mixture on the mechanical response of adobe bricks and Mortar has been addressed in this study in the static and dynamic regimes of the spectrum of strain rate induced loadings. The main mechanical parameters in compression and tension for adobe have been statistically determined from the static and dynamic tests. Mechanical properties and physical theories have been framed in several models that interpret the response of adobe for different applications. Constitutive models have been derived to address the uniaxial response in compression at different strain rates of adobes of different mineralogical composition and water contents. A finite element damage model has been developed to simulate the main failure modes specifically observed in earthen bricks at different loading conditions and rates, including high velocity impacts. The numerical study has been devoted at ensuring objectivity of analysis to the results of simulations performed using different mesh refinements of the geometrical model of the tested brick. Furthermore, engineering ballistic models that address the response of adobe walls to small caliber penetrations have been developed in this doctoral research. This thesis contains the description of the performed experiments, the analysis of data, the theoretical interpretations and the models developed for the material characterization of adobe masonry

  • Dynamic characterization of adobe in compression: the influence of fibre fraction in soil mixtures
    'International Association for Fracture Mechanics of Concrete and Concrete Structures', 2019
    Co-Authors: Li Piani T., Weerheijm J., Peroni M., Koene L., Solomos G., Sluys, Lambertus J., Pijaudier-cabot G., Grassl P., La Borderie C.
    Abstract:

    Adobe is one of the most ancient forms of masonry. Adobe bricks are sundried mixtures of clay, silt, sand and natural fibres locally available joined together using Mud Mortar. Adobe structures are largely spread in areas of the world prone to earthquakes or involved in military conflicts. Unfortunately, almost no literature concerns the dynamic assessment of soil-based masonry components. From earlier research, it was derived that the mechanical behaviour of adobe in statics fits in the class of quasi brittle materials. Its resemblance with cementitious materials concerns the main failure modes and the constitutive models in compression. This study deals with the experimental characterization of adobe components response in dynamics. It is aimed to study and quantify the rate sensitivity of adobe material from bricks at a wide range of strain rates, from statics up to impact conditions. In particular, the influence of fiber reinforcement in the mixture on the mechanical behaviour of the material has been addressed. Adobe bricks are commonly mixed using organic content locally available in the field, from straw to chopped wood. Fibres are added to prevent shrinkage cracks during the air drying process. In modern materials such as concrete, inclusion of artificial fibres is originally meant to enhance the mechanical performance of the material, benefiting from the selective properties of reinforcement and binder. An experimental campaign was carried out in a collaboration between Delft University of Technology, Dutch Ministry of Defence, TNO and the Joint Research Centre (JRC) of the European Commission. Two types of bricks were tested. They both had the same soil composition in terms of mineralogical family and soil elements proportions but only one was mixed using straw and wood. Cylindrical samples were subjected to compression tests at different rates of loadings in compression: low ( _ 1 = 3 10􀀀4 s􀀀1), intermediate ( _ 2 = 3 s􀀀1) and high ( _ 3 = 120 s􀀀1). High strain rate tests were performed using the split Hopkinson bar of the Elsa-HopLab (JRC). For each test, high resolution videos registered the failure process and force-displacement plots were recorded. Elaboration of results revealed clear trends in the dynamic material behaviour. Adobe, as concrete, is sensitive to the loading rate. The rate effects on the main properties of the material in strength and deformation are also analytically and numerically quantified. Rate sensitivity and failure mode are significantly influenced by the inclusion of fibers in the mixture. These effects are quantified, interpreted and compared with modern SFRC. This paper presents the experimental campaign and the obtained results. Moreover, physical interpretations for the observed trends are discussed. Finally, new formulations for the assessment of the dynamic increase factor of the compressive strength of adobe are proposed

  • Dynamic characterization of adobe in compression: the influence of fibre fraction in soil mixtures
    'International Association for Fracture Mechanics of Concrete and Concrete Structures', 2019
    Co-Authors: Li Piani T., Weerheijm J., Peroni M., Koene L., Solomos G., Sluys, Lambertus J.
    Abstract:

    Adobe is one of the most ancient forms of masonry. Adobe bricks are sundried mixtures of clay, silt, sand and natural fibres locally available joined together using Mud Mortar. Adobe structures are largely spread in areas of the world prone to earthquakes or involved in military conflicts. Unfortunately, almost no literature concerns the dynamic assessment of soil-based masonry components. From earlier research, it was derived that the mechanical behaviour of adobe in statics fits in the class of quasi brittle materials. Its resemblance with cementitious materials concerns the main failure modes and the constitutive models in compression. This study deals with the experimental characterization of adobe components response in dynamics. It is aimed to study and quantify the rate sensitivity of adobe material from bricks at a wide range of strain rates, from statics up to impact conditions. In particular, the influence of fiber reinforcement in the mixture on the mechanical behaviour of the material has been addressed. Adobe bricks are commonly mixed using organic content locally available in the field, from straw to chopped wood. Fibres are added to prevent shrinkage cracks during the air drying process. In modern materials such as concrete, inclusion of artificial fibres is originally meant to enhance the mechanical performance of the material, benefiting from the selective properties of reinforcement and binder. An experimental campaign was carried out in a collaboration between Delft University of Technology, Dutch Ministry of Defence, TNO and the Joint Research Centre (JRC) of the European Commission. Two types of bricks were tested. They both had the same soil composition in terms of mineralogical family and soil elements proportions but only one was mixed using straw and wood. Cylindrical samples were subjected to compression tests at different rates of loadings in compression: low ( _ 1 = 3 10􀀀4 s􀀀1), intermediate ( _ 2 = 3 s􀀀1) and high ( _ 3 = 120 s􀀀1). High strain rate tests were performed using the split Hopkinson bar of the Elsa-HopLab (JRC). For each test, high resolution videos registered the failure process and force-displacement plots were recorded. Elaboration of results revealed clear trends in the dynamic material behaviour. Adobe, as concrete, is sensitive to the loading rate. The rate effects on the main properties of the material in strength and deformation are also analytically and numerically quantified. Rate sensitivity and failure mode are significantly influenced by the inclusion of fibers in the mixture. These effects are quantified, interpreted and compared with modern SFRC. This paper presents the experimental campaign and the obtained results. Moreover, physical interpretations for the observed trends are discussed. Finally, new formulations for the assessment of the dynamic increase factor of the compressive strength of adobe are proposed.Applied MechanicsMaterials- Mechanics- Management & Desig

C M Raghucharan - One of the best experts on this subject based on the ideXlab platform.

  • Seismic Hazard and Risk Assessment in Central Indo-Gangetic Plains, India
    2020
    Co-Authors: C M Raghucharan
    Abstract:

    The exact location and time of an earthquake cannot be predicted with the present scientific knowledge, which has diverted the scientific community to move towards disaster mitigation to overcome its after-effects. Effective disaster mitigation involves predicting the seismic hazard/risk for a most probable earthquake that can occur at a given location so that the infrastructure can be built/repaired to sustain the earthquakes with bare minimal damage. Seismic hazard at a location can be computed from the recorded ground motions. However, ground motion records in India are scarce, and not available for every region, and certainly not for all magnitude and distance ranges. Employing ground motions from other regions may lead to inaccurate prediction. Hence, the viable alternative is to simulate ground motions in the broadband frequency range from the validated seismological model. Seismic hazard computed in previous studies has the following limitations. IS 1893:2016 reports seismic hazard values for only four zones covering the entire India. The National Disaster Management Authority (NDMA) developed a probabilistic seismic hazard contour map for India from the Ground Motion Prediction Equation (GMPE) using synthetic ground motions only. Similar small scale studies that were taken up in the present study region either computed hazard in terms of PGA or at city levels. Also, there is a possibility of potential earthquake of magnitude more than 8.0 in the seismic gap between the rupture zones of 1905 Kangra and 2015 Gorkha earthquakes. Hence, in this study, the seismic hazard for the entire Central IndoGangetic Plains (CIGP) is computed at district level, employing recorded and synthetic ground motions validated from the 2015 Nepal earthquake records. Furthermore, two new GMPEs were derived from the recorded and combined dataset (recorded as well as synthetics) to predict PGA and PSA at 25 periods between 0.01 and 4 s for the Himalayas and the IGP regions, employing Artificial Neural Network (ANN) methodology. Also, seismic risk in terms of probability of damage to buildings, economic losses, and casualties is not available for CIGP so far. Hence, vii utilizing the derived GMPEs and seismic hazard, the seismic risk is computed for the first time at 54 districts of Uttar Pradesh state covering the central part of IndoGangetic plains (CIGP). The response spectrum prediction of the validated seismological model is close to that of the recording, when compared to widely used existing GMPEs of IGP in literature. Hence, the model is used to generate the synthetic ground motion at data gap regions of CIGP. The two GMPEs derived in this study have a better fit with recorded data at eight stations and reported the least standard deviation of the error, V(H), than the existing GMPEs in Himalayas and IGP. Further, with the GMPEs derived in this study, the seismic hazard in terms of 10% and 2% probability of exceedance in 50 years, is computed at 54 districts of the study region. These hazard results obtained are comparable to the results of previous works available in the literature. Seismic risk assessment in CIGP acknowledges several key findings. Allahabad district, even though demarcated as Zone II in IS 1893: 2016, has expected economic losses around 16 billion dollars and the highest number of homeless and uninhabitable dwellings. Model Building Classes (MBCs) MMB (Mud Mortar Bricks with temporary roof) and BSR (Bricks with Stone Roof), comprising of 16.5 and 9.5% of total buildings, have collapse probability of 0.6 and 0.45 respectively These building types need immediate retrofitting or reconstruction for effective disaster mitigation. Also, 36% and 11% of buildings in CIGP might collapse for MCE and DBE earthquakes, respectively. Further, for a scenario magnitude range of Mw 7.5 to 8.5, the expected economic losses vary from 60 to 150 billion dollars, and the human casualties vary between 0.8 and 2.8 lakhs, respectively. The poor quality and low seismic resilience of buildings in CIGP region is the principal reason for the substantial economic losses and casualties. Finally, it was found that the most influential parameter is the magnitude, followed by source location and GMPE

  • Seismic damage and loss estimation for central Indo-Gangetic Plains, India
    'Springer Science and Business Media LLC', 2018
    Co-Authors: C M Raghucharan, Somala S N
    Abstract:

    The Indo-Gangetic Plains which lies between the Himalayan mountain ranges and peninsular India is considered to be the region of great concern due to its thick sediments and proximity to the seismically most active zone of India, the Himalayan collision zone. No earthquake loss estimation studies have been taken up previously in central Indo-Gangetic Plains (CIGP) so far. The goal of this paper is to compute the social and economic loss in CIGP region which will raise the awareness of the general public, policymakers and structural engineers about seismic risk in CIGP so that necessary mitigation measures will be taken up in advance. Further, the relative contribution of six input parameters to the overall uncertainty is ascertained from sensitivity analysis. Earthquake loss estimation reveals that Allahabad district, even though demarcated as zone II in IS 1893:2002, has expected economic losses around 9–13 billion dollars and the highest number of homeless and uninhabitable dwellings. Also, model building class (MBC) MMB (Mud Mortar bricks with temporary roof), comprising of 16.48% of total households in CIGP region, has high collapse rate when compared to other MBCs, due to the fact that those buildings have temporary roof made of wood, bamboo, polythene, plastic, thatch, Mud and others. Further, for a scenario magnitude range of Mw 7.5–8.5, the expected human casualties vary between 0.14 and 1.7 lakhs, and the economic losses vary from 18 to 140 billion dollars, respectively. These results may not be unrealistic, as the region happens to be in the seismic bypass of 1905 Kangra and 1934 Bihar–Nepal earthquakes, with an anticipated catastrophic earthquake of Mw > 8.0. The poor quality and low seismic resilience of buildings in CIGP region are the principal reasons for the corresponding huge casualties and economic losses. Finally, from the sensitivity analysis, we found that the most sensitive parameter is magnitude followed by GMPE and source location, respectively

Sluys, Lambertus J. - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic behaviour of adobe bricks in compression: The role of fibres and water content at various loading rates
    'Elsevier BV', 2020
    Co-Authors: Li Piani T., Weerheijm J., Peroni M., Koene L., Krabbenborg D., Solomos G., Sluys, Lambertus J.
    Abstract:

    This paper presents the results of an experimental research aimed at assessing the material performance of adobe bricks in compression for a wide range of induced strain rates, from statics to high velocity impact. Adobe connotes a traditional masonry whose bricks are made of sundried soil mixtures possibly reinforced with natural fibres and joined together using Mud Mortar. The inclusion of fibre and the presence of water in the mixture have a dominant effect on the mechanical performance of adobe bricks and masonry. Their influence on the dynamic behaviour of this material is quantified and interpreted in this study at high strain rates also with data produced through Hopkinson bar testing. Appropriate dynamic increase factors and constitutive equations for adobe materials in dynamics are also investigated. The paper presents the experimental campaign, shows the main results and offers qualitative and quantitative interpretations for the principal damage patterns observed.Applied MechanicsMaterials- Mechanics- Management & Desig

  • Dynamic characterization of adobe in compression: the influence of fibre fraction in soil mixtures
    'International Association for Fracture Mechanics of Concrete and Concrete Structures', 2019
    Co-Authors: Li Piani T., Weerheijm J., Peroni M., Koene L., Solomos G., Sluys, Lambertus J., Pijaudier-cabot G., Grassl P., La Borderie C.
    Abstract:

    Adobe is one of the most ancient forms of masonry. Adobe bricks are sundried mixtures of clay, silt, sand and natural fibres locally available joined together using Mud Mortar. Adobe structures are largely spread in areas of the world prone to earthquakes or involved in military conflicts. Unfortunately, almost no literature concerns the dynamic assessment of soil-based masonry components. From earlier research, it was derived that the mechanical behaviour of adobe in statics fits in the class of quasi brittle materials. Its resemblance with cementitious materials concerns the main failure modes and the constitutive models in compression. This study deals with the experimental characterization of adobe components response in dynamics. It is aimed to study and quantify the rate sensitivity of adobe material from bricks at a wide range of strain rates, from statics up to impact conditions. In particular, the influence of fiber reinforcement in the mixture on the mechanical behaviour of the material has been addressed. Adobe bricks are commonly mixed using organic content locally available in the field, from straw to chopped wood. Fibres are added to prevent shrinkage cracks during the air drying process. In modern materials such as concrete, inclusion of artificial fibres is originally meant to enhance the mechanical performance of the material, benefiting from the selective properties of reinforcement and binder. An experimental campaign was carried out in a collaboration between Delft University of Technology, Dutch Ministry of Defence, TNO and the Joint Research Centre (JRC) of the European Commission. Two types of bricks were tested. They both had the same soil composition in terms of mineralogical family and soil elements proportions but only one was mixed using straw and wood. Cylindrical samples were subjected to compression tests at different rates of loadings in compression: low ( _ 1 = 3 10􀀀4 s􀀀1), intermediate ( _ 2 = 3 s􀀀1) and high ( _ 3 = 120 s􀀀1). High strain rate tests were performed using the split Hopkinson bar of the Elsa-HopLab (JRC). For each test, high resolution videos registered the failure process and force-displacement plots were recorded. Elaboration of results revealed clear trends in the dynamic material behaviour. Adobe, as concrete, is sensitive to the loading rate. The rate effects on the main properties of the material in strength and deformation are also analytically and numerically quantified. Rate sensitivity and failure mode are significantly influenced by the inclusion of fibers in the mixture. These effects are quantified, interpreted and compared with modern SFRC. This paper presents the experimental campaign and the obtained results. Moreover, physical interpretations for the observed trends are discussed. Finally, new formulations for the assessment of the dynamic increase factor of the compressive strength of adobe are proposed

  • Dynamic characterization of adobe in compression: the influence of fibre fraction in soil mixtures
    'International Association for Fracture Mechanics of Concrete and Concrete Structures', 2019
    Co-Authors: Li Piani T., Weerheijm J., Peroni M., Koene L., Solomos G., Sluys, Lambertus J.
    Abstract:

    Adobe is one of the most ancient forms of masonry. Adobe bricks are sundried mixtures of clay, silt, sand and natural fibres locally available joined together using Mud Mortar. Adobe structures are largely spread in areas of the world prone to earthquakes or involved in military conflicts. Unfortunately, almost no literature concerns the dynamic assessment of soil-based masonry components. From earlier research, it was derived that the mechanical behaviour of adobe in statics fits in the class of quasi brittle materials. Its resemblance with cementitious materials concerns the main failure modes and the constitutive models in compression. This study deals with the experimental characterization of adobe components response in dynamics. It is aimed to study and quantify the rate sensitivity of adobe material from bricks at a wide range of strain rates, from statics up to impact conditions. In particular, the influence of fiber reinforcement in the mixture on the mechanical behaviour of the material has been addressed. Adobe bricks are commonly mixed using organic content locally available in the field, from straw to chopped wood. Fibres are added to prevent shrinkage cracks during the air drying process. In modern materials such as concrete, inclusion of artificial fibres is originally meant to enhance the mechanical performance of the material, benefiting from the selective properties of reinforcement and binder. An experimental campaign was carried out in a collaboration between Delft University of Technology, Dutch Ministry of Defence, TNO and the Joint Research Centre (JRC) of the European Commission. Two types of bricks were tested. They both had the same soil composition in terms of mineralogical family and soil elements proportions but only one was mixed using straw and wood. Cylindrical samples were subjected to compression tests at different rates of loadings in compression: low ( _ 1 = 3 10􀀀4 s􀀀1), intermediate ( _ 2 = 3 s􀀀1) and high ( _ 3 = 120 s􀀀1). High strain rate tests were performed using the split Hopkinson bar of the Elsa-HopLab (JRC). For each test, high resolution videos registered the failure process and force-displacement plots were recorded. Elaboration of results revealed clear trends in the dynamic material behaviour. Adobe, as concrete, is sensitive to the loading rate. The rate effects on the main properties of the material in strength and deformation are also analytically and numerically quantified. Rate sensitivity and failure mode are significantly influenced by the inclusion of fibers in the mixture. These effects are quantified, interpreted and compared with modern SFRC. This paper presents the experimental campaign and the obtained results. Moreover, physical interpretations for the observed trends are discussed. Finally, new formulations for the assessment of the dynamic increase factor of the compressive strength of adobe are proposed.Applied MechanicsMaterials- Mechanics- Management & Desig

  • The Ballistic Resistance of Adobe Masonry: An analytical model for impacts on Mud bricks and Mortar
    2017
    Co-Authors: Li Piani T., Weerheijm J., Koene L., Sluys, Lambertus J.
    Abstract:

    A significant number of published papers in the field of penetration mechanics devotes attention to the study of targets made of metal and ceramic materials for protective equipment. In recent times, the progression in harshness of urban warfare is leading western governments to investing in research focused on the ballistic response of building materials. Adobe, a traditional form of masonry made of unburnt soil bricks and Mud Mortar, is spread in areas of the world often involved into military conflicts. Knowledge on the material properties of the components and on the overall dynamic response of these structures is still scarce. Therefore, a ballistic campaign aimed at studying the penetration processes in Adobe was performed by TNO: residual velocity or penetration depth were measured for different small calibre projectiles impacting at different velocity Adobe walls with different composition and strength.The resulting information was collected and organized into a database. It was used as statistical basis to develop an analytical predictive model capable of correctly addressing the terminal ballistic depth, namely penetration length, in case of small calibre impacts on Adobe targets. The proposed phenomenological model, that belongs to a class of models based on Newton’s 2nd law, parametrizes the sources of energy dissipation during penetration through a linear dependent bearing resisting force model. The properties of the targets were experimentally determined during an additional experimental characterization campaign performed on Adobe components in 2016 in the Netherlands.The paper presents the experimental data, the analytical model developed and the calibration of parameters, providing the relation between the experimental and the predicted penetration lengths.Applied Mechanic

Hardjito Djwantoro - One of the best experts on this subject based on the ideXlab platform.

  • Rheology of High Volume Sidoarjo Mud Mortar
    'Trans Tech Publications Ltd.', 2014
    Co-Authors: Widodo, Teguh Hermawan, Chandra Lucky, Hardjito Djwantoro
    Abstract:

    Previous studies on Sidoarjo volcanic Mud have been largely focusing on its use as lowvolume cement replacement pozzolanic material and not as a high-volume cement replacement material. This study is intended to study the behaviour of fresh Mortar incorporating Sidoarjo volcanic Mud as cement replacement in high-volume i.e. 50, 55 and 60 and compares the results with the ones of high-volume fly ash Mortar. Calcination and grinding were applied as pretreatment for the Mud to make it more reactive. Grinding time was varied into three different grinding time periods from two to eight hours, to vary the particle sizes of the calcined Mud. The results show that the finer the particle size of the Sidoarjo volcanic Mud, the bigger the flow of the fresh Mortar. The flow of fresh Mortar containing the Sidoarjo Mud is lower compared to those of the ones with fly ash

  • On The Development of High Volume Volcanic Mud and Concrete
    2013
    Co-Authors: Hardjito Djwantoro, Chandra Lucky, Widodo, Teguh Hermawan
    Abstract:

    A Mud volcano has been emerging since May 2006, in Sidoarjo, Indonesia, as a result of faulty in oil drilling. Since then, the Mud has submerged more than 700 hectares of productive land, housing and industrial areas and infrastructures. To date, the eruption still continues, and there is no sign that it will end in the near future. The contents of Mud are predominantly SiO2, Al2O3 and Fe2O3 in crystalline form, with the total amount more than 80. This paper reports an attempt to utilize the volcanic Mud in high volume volcanic Mud Mortar and concrete. After pre-treatment in the form of calcinations and grinding, the volcanic Mud was found to be reactive. Treated volcanic Mud in the amount up to 60 of the total cementitious material was utilized to produce Mortar and concrete. The main variables were the fineness of the treated Mud and the amount of the Mud. It was found that the particle size of the treated Mud plays an important role on the properties of Mortar and concrete, whereby the finer provides the better properties. With 60 usage of volcanic Mud of the total mass of cementitious material, the strength activity index (SAI) of the Mortar at the age of 7, 14, 28 and 56 days were found to be more than 80. This study reveals the potential of volcanic Mud from Sidoarjo, East Java, Indonesia, to be used as pozzolanic material in high volume volcanic Mud Mortar and concrete

Widodo, Teguh Hermawan - One of the best experts on this subject based on the ideXlab platform.

  • Rheology of High Volume Sidoarjo Mud Mortar
    'Trans Tech Publications Ltd.', 2014
    Co-Authors: Widodo, Teguh Hermawan, Chandra Lucky, Hardjito Djwantoro
    Abstract:

    Previous studies on Sidoarjo volcanic Mud have been largely focusing on its use as lowvolume cement replacement pozzolanic material and not as a high-volume cement replacement material. This study is intended to study the behaviour of fresh Mortar incorporating Sidoarjo volcanic Mud as cement replacement in high-volume i.e. 50, 55 and 60 and compares the results with the ones of high-volume fly ash Mortar. Calcination and grinding were applied as pretreatment for the Mud to make it more reactive. Grinding time was varied into three different grinding time periods from two to eight hours, to vary the particle sizes of the calcined Mud. The results show that the finer the particle size of the Sidoarjo volcanic Mud, the bigger the flow of the fresh Mortar. The flow of fresh Mortar containing the Sidoarjo Mud is lower compared to those of the ones with fly ash

  • On The Development of High Volume Volcanic Mud and Concrete
    2013
    Co-Authors: Hardjito Djwantoro, Chandra Lucky, Widodo, Teguh Hermawan
    Abstract:

    A Mud volcano has been emerging since May 2006, in Sidoarjo, Indonesia, as a result of faulty in oil drilling. Since then, the Mud has submerged more than 700 hectares of productive land, housing and industrial areas and infrastructures. To date, the eruption still continues, and there is no sign that it will end in the near future. The contents of Mud are predominantly SiO2, Al2O3 and Fe2O3 in crystalline form, with the total amount more than 80. This paper reports an attempt to utilize the volcanic Mud in high volume volcanic Mud Mortar and concrete. After pre-treatment in the form of calcinations and grinding, the volcanic Mud was found to be reactive. Treated volcanic Mud in the amount up to 60 of the total cementitious material was utilized to produce Mortar and concrete. The main variables were the fineness of the treated Mud and the amount of the Mud. It was found that the particle size of the treated Mud plays an important role on the properties of Mortar and concrete, whereby the finer provides the better properties. With 60 usage of volcanic Mud of the total mass of cementitious material, the strength activity index (SAI) of the Mortar at the age of 7, 14, 28 and 56 days were found to be more than 80. This study reveals the potential of volcanic Mud from Sidoarjo, East Java, Indonesia, to be used as pozzolanic material in high volume volcanic Mud Mortar and concrete