The Experts below are selected from a list of 2205 Experts worldwide ranked by ideXlab platform

Jie Han - One of the best experts on this subject based on the ideXlab platform.

  • spring based trapdoor tests investigating soil arching stability in Embankment Fill under localized surface loading
    Journal of Geotechnical and Geoenvironmental Engineering, 2021
    Co-Authors: Mahdi Alnaddaf, Jie Han
    Abstract:

    AbstractPile-supported (PS) Embankments have been used increasingly to support highways and railways on soft subsoils. In addition to the self-weight of the Embankment, this Embankment system is of...

  • Scaled model tests on influence factors of full geosynthetic-reinforced pile-supported Embankments
    Geosynthetics International, 2016
    Co-Authors: Shitong Song, Jie Han
    Abstract:

    A geosynthetic-reinforced pile-supported (GRPS) Embankment that consists of Embankment Fill, geosynthetic, piles, and foundation soils is a complex soil–structure system. Its key load transfer mechanisms include soil arching and tensioned membrane effects and subsoil resistance. Type of Embankment Fill (cohesive or cohesionless) and type of pile (end-bearing or floating) are expected to affect these load transfer mechanisms; however, their influence has not been well investigated. Six scaled model tests were conducted in this study to investigate the influence of the Embankment Fill properties, the clear spacing of pile caps, and the pile type on soil arching and tensioned membrane effects. This study used cohesive and cohesionless Embankment Fills and end-bearing and floating piles. The test results show that the cohesive Embankment Fill strengthened the soil-arching effect, increased the pile efficacy, and reduced the settlements of the subsoil between pile caps and the Embankment crest under the same l...

  • dem analysis of stresses and deformations of geogrid reinforced Embankments over piles
    International Journal of Geomechanics, 2012
    Co-Authors: Jie Han, Anil Bhandari, Fei Wang
    Abstract:

    AbstractThe geosynthetic-reinforced pile-supported Embankment is one of the favorable ground improvement techniques used in the construction of earth structures over a compressible soil when limited construction time is available and limited deformation is permissible. Various methods are available for the design of the geosynthetic-reinforced platform based on various load transfer mechanisms from the Embankment to the piles and the compressible soil. The existence of the geosynthetic layer makes the mechanisms more complex. This study focuses on the behavior of geogrid-reinforced Embankments over piles compared with the behavior of unreinforced Embankments. The numerical simulations of the unreinforced and reinforced pile-supported Embankments were conducted using the discrete element method (DEM). The Embankment Fill was simulated using unbonded graded aggregates of diameters ranging from 9.2 to 20.8 mm and the geogrid was simulated using bonded particles. This study investigated the changes of vertica...

  • two dimensional deep seated slope stability analysis of Embankments over stone column improved soft clay
    Engineering Geology, 2011
    Co-Authors: Sari W Abusharar, Jie Han
    Abstract:

    A two-dimensional (2D) finite difference method was adopted in this study to estimate the factor of safety (FS) against deep-seated failure of Embankments over stone column-improved soft clay based on individual column and equivalent area models. In the equivalent area model, the equivalent parameters (unit weight, cohesion, and friction angle) for the improved area were estimated based on the area average of the parameters from stone columns and soft clay. The factors influencing the FS against deep-seated failure of Embankments over stone column-improved soft clay were investigated including the spacing, size, and friction angle of stone columns, cohesion of soft clay, friction angle and height of Embankment Fill, and existence of ground water. Based on the numerical results, a reduction factor was proposed to account for the difference in the FS when the individual column model is converted to the equivalent area model. The effects of the influence factors on the reduction factor were also investigated. The comparative study shows that the FS values obtained by the equivalent area model are higher than those by the individual column model. The results of these analyses are summarized into a series of design charts, which can be used in engineering practice. A reduction factor for FS of 0.90 is appropriate to convert the calculated FS by the equivalent area model to that by the individual column model based on the current study. Furthermore, the existence of the water table results in lower FS values than the cases without considering a water table because the groundwater reduces the shear strength of the improved foundation.

  • experimental study and numerical simulation on concrete box culverts in trenches
    Journal of Performance of Constructed Facilities, 2010
    Co-Authors: Baoguo Chen, Junjie Zheng, Jie Han
    Abstract:

    Concrete culverts in trenches have been widely used in expressways. Problems frequently take place because of improperly estimated vertical earth pressures on culverts. Different codes have been used in China to estimate the design load on culverts. In this study, a full-scale experiment and FEM simulation were conducted to evaluate the variation of vertical earth pressures and soil arching in backFill and to examine the accuracy of the methods recommended by different design codes including the prevailing Chinese General Code for Design of Highway Bridges and Culverts based on the linear earth pressure theory. The measured vertical earth pressures from the experiment were compared with those from the current theoretical methods. The variations of foundation pressure and settlement were also analyzed. The FEM simulation investigated the key influencing factors on the vertical earth pressures including the height of the Embankment Fill, the width of the trench, the slope angle of the trench, the dimensions of the culvert, the properties of the backFill, and the elastic modulus of the foundation soil. This research reveals that soil arch formed when the backFill on the culvert reached a certain height, but it was unstable. The coefficient of the vertical earth pressure on the top of the culvert was significantly different from that recommended by the Chinese General Code for Design of Highway Bridges and Culverts.

Tuncer B. Edil - One of the best experts on this subject based on the ideXlab platform.

  • creep response of compacted waste foundry sands for use as roadway Embankment Fill
    Journal of Geotechnical and Geoenvironmental Engineering, 2018
    Co-Authors: Jie Yin, Ali Soleimanbeigi, William J Likos, Tuncer B. Edil
    Abstract:

    AbstractCompressibility of five different samples of waste foundry sand (WFS) was evaluated through one-dimensional and triaxial compression tests to assess permanent strains under vertical and dev...

  • geotechnical and leaching properties of municipal solid waste incineration fly ash for use as Embankment Fill material
    Transportation Research Record, 2016
    Co-Authors: Yibo Zhang, Ali Soleimanbeigi, William J Likos, Tuncer B. Edil
    Abstract:

    The beneficial use of municipal solid waste incineration (MSWI) fly ash promotes sustainability in highway construction. This study investigated the geotechnical and chemical leaching characteristics of fresh and aged MSWI fly ash samples for use of the material in highway construction applications. The results show that the geotechnical properties of MSWI fly ash resemble those of silty sands with poor drainage capacity. Compared with fresh ash (<10 days since placement), aged ash (3 to 6 months) has a higher California bearing ratio, higher unconfined compressive strength, and greater freeze–thaw durability. The concentrations of cadmium, chromium, selenium, silver, and sulfate from water leach tests are below the limits stipulated in Wisconsin NR 538. The concentrations of heavy metals in leachate from Synthetic Precipitation Leaching Procedure tests are below the U.S. Environmental Protection Agency’s standard maximum contaminant level, with the exception of arsenic. Cumulative mass release from colum...

  • engineering properties of recycled materials for use as Embankment Fill
    Geo-Congress 2014American Society of Civil Engineers, 2014
    Co-Authors: Ali Soleimanbeigi, Tuncer B. Edil, Craig H Benson
    Abstract:

    Use of recycled materials promotes sustainability in geotechnical construction. Compaction characteristics, hydraulic conductivity, shear strength and compressibility of bottom ash (BA), foundry slag (FS), recycled asphalt pavement (RAP), and recycled asphalt shingles (RAS) that are produced in large quantities were characterized. Results showed that BA, FS, and RAS have lower maximum dry unit weight than compacted sand and the dry unit weights are not sensitive to compaction moisture content. Shear strength of the tested recycled materials are adequate to provide stability for typical highway Embankments. The measured hydraulic conductivities provide sufficient drainage capacity for Embankment Fills. Results of one- dimensional compression tests showed that BA and FS have comparable compressibility to that of compacted sand up to vertical effective stress (ߪ ௩ ' ) of 200 kPa after which BA and FS exhibited higher compressibility than sand due to crushing of individual particles. Compressibility of RAS is significantly higher than that of sand which makes the material unsuitable as Embankment Fill. RAP consistently has higher compressibility than sand; however, settlement of typical highway Embankments constructed with RAP is still below the typical allowable limit. BA, FS, and RAP have appropriate engineering properties for use as structural Fill in typical highway Embankments. RAS should be mixed with at least 50% of granular additive to reduce compressibility to an acceptable limit. Construction of Embankments with RAS mixture or RAP is recommended during warm seasons to induce thermal preloading and reduce compressibility.

  • Numerical Analysis of Catenary Load Transfer Platform for Geopier-Supported Embankment
    Advances in Measurement and Modeling of Soil Behavior, 2007
    Co-Authors: Che Hassandi Abdullah, Tuncer B. Edil
    Abstract:

    Column-supported Embankments provide a rapid means of construction in areas where subsurface consists of fine-grained soft soils. A load transfer platform (LTP) is usually provided at the base of the Embankment to even out differential settlement and minimize overall deformation of the Embankments. The mechanism of load transfer in geosynthetic-reinforced LTPs (GRLTP) supported on columns is, in general, poorly understood. Especially, the case of soil arching within the Embankment Fill from which the proportion of the Embankment load that is transferred to the columns and to the subsoil is determined. A well instrumented full- scale test Embankment incorporating a catenary GRLTP and supported by rammed aggregate piers (geopiers) was built in Malaysia. The results of the numerical analysis and its relation to field data are presented along with implications for arching ratio. Overall, the relatively simple elastic-perfectly plastic Mohr-Coulomb constitutive model was able to capture the essential Embankment/load transfer platform behavior based on conventional data regarding material properties and subsurface conditions. The arching ratio assumed in the design of catenary load transfer platform based on the British design method is significantly higher than that indicated by the field-calibrated numerical analysis and the field measurements.

Anand J Puppala - One of the best experts on this subject based on the ideXlab platform.

  • design and construction of lightweight eps geofoam embedded geomaterial Embankment system for control of settlements
    Geotextiles and Geomembranes, 2019
    Co-Authors: Anand J Puppala, Pinit Ruttanaporamakul, Surya Sarat Chandra Congress
    Abstract:

    Abstract This paper presents a research study on a bridge site located along US highway 67 over SH 174 in Cleburne, Texas, where bridge approach slabs have experienced more than 0.4 m (17 in.) of settlement within a span of 16 years after construction. Many treatment methods attempted to mitigate this problem had proven to be ineffective. As part of novel rehabilitation works, the top of existing Fill soil on the Embankment was replaced with lightweight expanded polystyrene (EPS) geofoam blocks to alleviate the approach slab settlements. This paper describes initial design and construction details of the rehabilitation works performed on the Embankment system along with a focus on the early performance details. Field monitoring studies were conducted for almost three years to study the bump/settlements under the EPS geofoam Embankment system. Short term measured settlement data was analyzed with hyperbolic model to predict the long term settlements. Numerical finite element studies attempted in this study showed that settlements could be reasonably predicted by modeling these geofoam Embankments. Based on the monitoring and modeling studies, the effectiveness of utilizing EPS geofoam as an Embankment Fill material was addressed to mitigate the differential settlements under a bridge approach slab.

  • settlement mitigation of a distressed Embankment in texas by utilization of lightweight eps geofoam material
    Transportation Research Board 95th Annual MeetingTransportation Research Board, 2016
    Co-Authors: Pinit Ruttanaporamakul, Anand J Puppala, Tejo V Bheemasetti, Aravind Pedarla, Richard Williammee
    Abstract:

    Approach slab settlement occurring at the start of a bridge super structure is one of the most common problems in many states across USA, resulting in rider discomfort and unsafe riding conditions. Federal and State transportation agencies continue to spend millions of dollars annually to repair the ‘bump’ problem. Major factors contributing to these settlements are the long term compressibility of backFill materials as well as the erosion of backFill material. This paper documents a distress occurred at the approach slabs on each end of the US 67 bridge over SH 174 in Johnson County, Cleburne, Texas. This approach slab had experienced more than 16 in. (406 mm) of settlement in 16 years since its initial construction. Current study highlighted the factors causing distress in the Embankment and evaluated the remedial technique adopted at this site. Native Fill material at the top of the Embankment was replaced with lightweight expanded polystyrene (EPS) geofoam blocks. This technique considerably reduced the magnitude of overburden stresses transferred to the underlying layers as well as the erosion of Embankment Fill soil. This remediation also mitigated further settlements of the Embankment Fill and foundation soils. Field monitoring studies using inclinometers and pressure plates have been conducted at regular time intervals for a period of three years to study the long term performance of EPS geofoam under live traffic. The long-term settlements of the rehabilitated Embankment were predicted by using the field measured data with the hyperbolic method. These studies were validated using measured field settlement data. Based on the current study, the effectiveness of adopting EPS geofoam as the Embankment Fill material near a bridge approach slab is evaluated.

  • numerical modeling of a highway Embankment using geofoam material as partial Fill replacement
    2014 Congress on Geo-Characterization and Modeling for Sustainability Geo-Congress 2014, 2014
    Co-Authors: Raju Acharya, Tejo V Bheemasetti, Pinit Ruttanaporamakul, Bhaskar C S Chittoori, Anand J Puppala
    Abstract:

    Geofoam material has been used as a partial replacement for conventional Fill material in a highway Embankment in Texas, USA, to mitigate bridge-approach slab settlements. The Embankment under current focus was constructed more than a decade ago and has experienced nearly 405 mm (16 in.) of settlement since its construction. Several treatment methods were attempted in mitigating the settlement, which were proven to be ineffective. One of the primary causes of the settlement was attributed to Embankment and its self-weight. To reduce the weight, part of the Embankment Fill was replaced with a lightweight EPS geofoam material. This site was extensively instrumented with horizontal inclinometers at different locations for monitoring the settlements after rehabilitation. Settlements occurring in the field have been monitored periodically. To understand the settlement patterns occurring in the field and also to identify the long-term performance of this section, numerical and analytical hyperbolic modeling were attempted. Both these models are used to predict the approximate long-term settlements. Prediction results indicate that the settlements predicted by the hyperbolic model are higher when compared with the same predicted by numerical model.

  • long term performance of expanded clay and shale as an Embankment Fill
    Transportation Research Board 93rd Annual MeetingTransportation Research Board, 2014
    Co-Authors: Anand J Puppala, Sireesh Saride, Bhaskar C S Chittoori, Raja Yenigalla, Ekarut Archeewa
    Abstract:

    This paper presents the results of a field and numerical study performed to study the long term performance of a bridge Embankment designed with lightweight aggregates, Expanded Clay and Shale (ECS) aggregate, to mitigate the settlements on a soft soil. The ECS aggregates were used as a backFill material to construct the southbound lanes of a bridge Embankment constructed at south extension of SH-360, Arlington, Texas. The test sections were instrumented with inclinometers to mark the lateral movements of the novel Embankment material. The instrumentation was monitored for more than six years to date. An extensive series of laboratory tests were conducted, a prior, to obtain the engineering behavior of ECS and the select Fill, which was used as a control Fill on the northbound lanes of the Embankment. The properties of both the materials were used in the finite element modeling to simulate the Embankment sections to verify the long term performance. The field instrumentation data was used to validate the modeling analysis. The modeling was extended to other Embankment configurations by varying the heights and slopes of the Embankment, thicknesses of the subgrade soil and also the compression indices of the subgrade soil after validating the ECS test section with the measured data for the development of design charts.

  • settlement mitigation using light weight Fill Embankment systems
    Sound Geotechnical Research to Practice: Honoring Robert D. Holtz II, 2013
    Co-Authors: Anand J Puppala, Bhaskar C S Chittoori, Raja Yenigalla, Ekarut Archeewa
    Abstract:

    Settlement and heave related movements of bridge approach slabs relative to bridge decks create a bump in the roadway causing inconvenience to the travelling public and at times so large as to make travelling unsafe. Hence, it is important to adopt suitable remedial methods to mitigate the approach settlements in order to ensure safe traveling conditions and also reduce repair/maintenance costs. This paper presents the use of a lightweight Fill material, Expanded Clay Shale (ECS) material as an Embankment Fill. Laboratory studies on Fill material, field instrumentation and monitoring, and numerical analyses are performed and these results are discussed here. Test results show that the ECS Embankment system experienced lesser settlements than the conventional Embankment Fills. Numerical modeling also provided settlement predictions that are closely matched with the field measurements. In conclusion, design charts are introduced for the construction of light weight Fill Embankments using Expanded Clay and Shale material. INTRODUCTION AND BACKGROUND Bridge approach settlement and the formation of the bump near a bridge are extensively reported (Puppala et al., 2010). This problem usually emanates from soil settlement related problems arising from both Embankment Fill and subgrade foundation materials. Maintenance of these bridge approach slab settlements cost millions of dollars to repair annually and this mainly absorbs all the maintenance resources (Briaud et al., 1997). The primary sources of the problem can be broadly divided into four categories: 1) Material properties of foundation and Embankment, 2) Design criteria for bridge

Junjie Zheng - One of the best experts on this subject based on the ideXlab platform.

  • soil arch analysis of piled Embankment by a modified 3d model and field experiments
    DEStech Transactions on Engineering and Technology Research, 2017
    Co-Authors: Ke Cheng, Yu Miao, Junjie Zheng
    Abstract:

    Piled Embankments have been widely used in road engineering. A unique mechanical behavior which is called soil arching effect in piled Embankments is a key factor in load distribution. In this study, a modified 3D finite element model is presented to analyze the soil arching effect in piled Embankments. The interaction among the pile, subsoil and Embankment Fill is simulated by springs with various stiffness values. A field test is conducted to get the actual engineering data. Based on the results comparison, several contrast numerical analyses are performed by changing the pile spacing. The critical maximum and minimum heights of the soil arch can be clearly obtained via the numerical model and the critical height of soil arching of the numerical model is consistent with that of Hewlett’s theory. The numerical model is not only easily implemented but time-saving, which is a new method for researchers to analyze soil arching effect in piled Embankments.

  • visualization of the formation and features of soil arching within a piled Embankment by discrete element method simulation
    Journal of Zhejiang University Science, 2016
    Co-Authors: Hanjiang Lai, Junjie Zheng, Rongjun Zhang, Mingjuan Cui
    Abstract:

    Piled Embankments are widely used in highway and railway engineering due to their economy and efficiency in overcoming several issues encountered in constructing Embankments over weak soils. Soil arching, caused by the pile-subsoil relative displacement (Δs), plays an important role in reducing the Embankment load falling on weak soil, however, the fundamental characteristics (e.g., formation and features) of soil arching remain poorly understood. In this study, a series of discrete element method (DEM) modellings are performed to study the formation and features of soil arching with the variation of Δs in piled Embankments with or without geosynthetic reinforcement. Firstly, calibration for the modelling parameters is carried out by comparing the DEM results with the experimental data obtained from the existing literature. Secondly, the analysis of the macroand micro-behaviours is performed in detail. Finally, a parametric study is conducted in an effort to identify the influences of three key factors on soil arching: the friction coefficient of the Embankment Fill (f), the Embankment height (h), and the pile clear spacing (s−a). Numerical results indicate that Δs is a key factor governing the formation and features of soil arching in Embankments. To be specific, soil arching gradually evolves from two inclined shear planes at a small Δs to a hemispherical arch at a relatively large Δs. Then, with a continuous increase in Δs, the soil arching height gradually increases and finally approaches a constant value of 0.8(s−a) (i.e., the maximum soil arching height). For a given case, the higher the soil arching height, the greater the degree of soil arching effect. The parametric study shows that the friction coefficient of the Embankment Fill has a negligible influence on the formation and features of soil arching. However, Embankment height is a key factor governing the formation and features of soil arching. In addition, pile clear spacing has a significant effect on the formation of soil arching, but not on its features.

  • dem analysis of soil arching within geogrid reinforced and unreinforced pile supported Embankments
    Computers and Geotechnics, 2014
    Co-Authors: Hanjiang Lai, Junjie Zheng, Rongjun Zhang, Jun Zhang, Lan Cui
    Abstract:

    Abstract Geogrid-reinforced and pile-supported (GRPS) Embankments have been widely used in road engineering due to their economy and effectiveness. The soil arching effect is a key factor in the load transfer mechanism of GRPS technique. In this study, a series of numerical simulations are conducted with the particle flow code PFC2D to study the evolution of soil arching with increasing surcharge. First, an Improved Multi-layer Compaction Method (IMCM) is proposed and applied to establish the Discrete Element Method (DEM) models with more reasonable initial stress states. Validation is then conducted by comparing the DEM results with experimental data. Second, detailed macro-behaviour (e.g., efficacy) and micro-behaviour (e.g., contact forces and fabric anisotropy) analyses are performed. Finally, parametric study is performed to identify the effects of two key factors, i.e., the stiffness of subsoil and the grain composition of Embankment Fill. Simulation results indicate that the strong force network (SN) serves as a load-carrying force chain, which is the main component of soil arching; while the weak force network (WN) acts as a support system. When a pile-supported Embankment is high enough, the soil arching will experience three stages as the surcharge increases. In the first stage, the soil arching develops and its effect is strengthened gradually. In the second stage, the soil arching is fully mobilized and experiences a “forming-failure-reforming” process as the surcharge increases. While in the third stage, the Embankment is unable to form a new stable soil arching and the efficacy decreases gradually. However, for the GRPS Embankment, due to the reinforcement of geogrid, the third stage will not occur throughout the entire surcharge range of interest in this study. On the basis of the macro- and micro-results, the conclusion can be drawn that the presence of geogrid does not alter the failure mode of soil arching under the surcharge, though it is able to evidently improve the efficacy of load transfer and enhance the stability of soil arching.

  • experimental study and numerical simulation on concrete box culverts in trenches
    Journal of Performance of Constructed Facilities, 2010
    Co-Authors: Baoguo Chen, Junjie Zheng
    Abstract:

    Concrete culverts in trenches have been widely used in expressways. Problems frequently take place because of improperly estimated vertical earth pressures on culverts. Different codes have been used in China to estimate the design load on culverts. In this study, a full-scale experiment and FEM simulation were conducted to evaluate the variation of vertical earth pressures and soil arching in backFill and to examine the accuracy of the methods recommended by different design codes including the prevailing Chinese General Code for Design of Highway Bridges and Culverts based on the linear earth pressure theory. The measured vertical earth pressures from the experiment were compared with those from the current theoretical methods. The variations of foundation pressure and settlement were also analyzed. The FEM simulation investigated the key influencing factors on the vertical earth pressures including the height of the Embankment Fill, the width of the trench, the slope angle of the trench, the dimensions of the culvert, the properties of the backFill, and the elastic modulus of the foundation soil. This research reveals that soil arch formed when the backFill on the culvert reached a certain height, but it was unstable. The coefficient of the vertical earth pressure on the top of the culvert was significantly different from that recommended by the Chinese General Code for Design of Highway Bridges and Culverts.

  • experimental study and numerical simulation on concrete box culverts in trenches
    Journal of Performance of Constructed Facilities, 2010
    Co-Authors: Baoguo Chen, Junjie Zheng, Jie Han
    Abstract:

    Concrete culverts in trenches have been widely used in expressways. Problems frequently take place because of improperly estimated vertical earth pressures on culverts. Different codes have been used in China to estimate the design load on culverts. In this study, a full-scale experiment and FEM simulation were conducted to evaluate the variation of vertical earth pressures and soil arching in backFill and to examine the accuracy of the methods recommended by different design codes including the prevailing Chinese General Code for Design of Highway Bridges and Culverts based on the linear earth pressure theory. The measured vertical earth pressures from the experiment were compared with those from the current theoretical methods. The variations of foundation pressure and settlement were also analyzed. The FEM simulation investigated the key influencing factors on the vertical earth pressures including the height of the Embankment Fill, the width of the trench, the slope angle of the trench, the dimensions of the culvert, the properties of the backFill, and the elastic modulus of the foundation soil. This research reveals that soil arch formed when the backFill on the culvert reached a certain height, but it was unstable. The coefficient of the vertical earth pressure on the top of the culvert was significantly different from that recommended by the Chinese General Code for Design of Highway Bridges and Culverts.

Ali Soleimanbeigi - One of the best experts on this subject based on the ideXlab platform.

  • creep response of compacted waste foundry sands for use as roadway Embankment Fill
    Journal of Geotechnical and Geoenvironmental Engineering, 2018
    Co-Authors: Jie Yin, Ali Soleimanbeigi, William J Likos, Tuncer B. Edil
    Abstract:

    AbstractCompressibility of five different samples of waste foundry sand (WFS) was evaluated through one-dimensional and triaxial compression tests to assess permanent strains under vertical and dev...

  • geotechnical and leaching properties of municipal solid waste incineration fly ash for use as Embankment Fill material
    Transportation Research Record, 2016
    Co-Authors: Yibo Zhang, Ali Soleimanbeigi, William J Likos, Tuncer B. Edil
    Abstract:

    The beneficial use of municipal solid waste incineration (MSWI) fly ash promotes sustainability in highway construction. This study investigated the geotechnical and chemical leaching characteristics of fresh and aged MSWI fly ash samples for use of the material in highway construction applications. The results show that the geotechnical properties of MSWI fly ash resemble those of silty sands with poor drainage capacity. Compared with fresh ash (<10 days since placement), aged ash (3 to 6 months) has a higher California bearing ratio, higher unconfined compressive strength, and greater freeze–thaw durability. The concentrations of cadmium, chromium, selenium, silver, and sulfate from water leach tests are below the limits stipulated in Wisconsin NR 538. The concentrations of heavy metals in leachate from Synthetic Precipitation Leaching Procedure tests are below the U.S. Environmental Protection Agency’s standard maximum contaminant level, with the exception of arsenic. Cumulative mass release from colum...

  • Compressibility of Recycled Materials for Use As Highway Embankment Fill
    Journal of Geotechnical and Geoenvironmental Engineering, 2015
    Co-Authors: Ali Soleimanbeigi
    Abstract:

    AbstractCompressibility of recycled materials including bottom ash (BA), foundry slag (FSG), foundry sand (FSD), recycled asphalt pavement (RAP), recycled pavement material (RPM), recycled concrete aggregate (RCA), and recycled asphalt shingle (RAS) mixed with glacial outwash sand (GOS) was evaluated using one-dimensional (1D) compression tests. Results showed that except RCA, compressibility of all the compacted recycled materials is higher than that of the compacted GOS. Different compression mechanisms were attributed to each recycled material depending on the type, composition, and morphological characteristics of the particles. Bituminous recycled materials including RAP, RPM, and RAS-GOS mixtures exhibited relatively higher compressibility compared with nonbituminous recycled materials. At a constant vertical effective stress (σv′), compression of the recycled materials increased over time with strain rates that are higher for bituminous recycled materials compared to nonbituminous recycled material...

  • engineering properties of recycled materials for use as Embankment Fill
    Geo-Congress 2014American Society of Civil Engineers, 2014
    Co-Authors: Ali Soleimanbeigi, Tuncer B. Edil, Craig H Benson
    Abstract:

    Use of recycled materials promotes sustainability in geotechnical construction. Compaction characteristics, hydraulic conductivity, shear strength and compressibility of bottom ash (BA), foundry slag (FS), recycled asphalt pavement (RAP), and recycled asphalt shingles (RAS) that are produced in large quantities were characterized. Results showed that BA, FS, and RAS have lower maximum dry unit weight than compacted sand and the dry unit weights are not sensitive to compaction moisture content. Shear strength of the tested recycled materials are adequate to provide stability for typical highway Embankments. The measured hydraulic conductivities provide sufficient drainage capacity for Embankment Fills. Results of one- dimensional compression tests showed that BA and FS have comparable compressibility to that of compacted sand up to vertical effective stress (ߪ ௩ ' ) of 200 kPa after which BA and FS exhibited higher compressibility than sand due to crushing of individual particles. Compressibility of RAS is significantly higher than that of sand which makes the material unsuitable as Embankment Fill. RAP consistently has higher compressibility than sand; however, settlement of typical highway Embankments constructed with RAP is still below the typical allowable limit. BA, FS, and RAP have appropriate engineering properties for use as structural Fill in typical highway Embankments. RAS should be mixed with at least 50% of granular additive to reduce compressibility to an acceptable limit. Construction of Embankments with RAS mixture or RAP is recommended during warm seasons to induce thermal preloading and reduce compressibility.