Article
Engineering, Geological
Lei Wang, Jian Chu, Shifan Wu
Summary: This study investigated the failure and stress-strain behavior of biocemented sand under plane strain conditions. The increase in calcium carbonate content led to increased brittleness and dilation of the biocemented sand. The friction angle and effective cohesion also increased with the increasing calcium carbonate content.
Article
Construction & Building Technology
Milad Abolfazli, Rodolfo Ivan John Reyes, Dion Choong, Milad Bazli, Ali Rajabipour, Hamid Pourasiabi, Mehrdad Arashpour
Summary: The paper provides an overview of the current research on bond performance between FRP tubes and SWSSC and investigates the bond strength of SWSSC-filled FRP tubes after exposure to different temperatures using push-out tests. It was observed that exposure to elevated temperatures increased the bond strength of all the tubes. The study concluded that the bond strength of all the samples was predominantly influenced by the surface roughness of the inner tube rather than the fibre type.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Geological
Ali Lashkari, Vahid Jamali
Summary: This study investigated the influence of overall particle shape, mean particle size, initial relative density, and effective normal stress on the soil-geosynthetic interaction through direct shear interface tests. Results showed that higher peak friction angles were mobilized with increases in initial relative density and angularity of sand particles, as well as a decrease in effective normal stress. Additionally, the slip at the interface was found to increase with the initial relative density of sand and regularity of particles, and decrease with increasing mean particle size and effective normal stress.
Article
Engineering, Geological
Deyun Liu, Sergio D. N. Lourenco
Summary: This study investigated the stress-dilatancy behavior of a sand coated with a polymer (polydimethylsiloxane) through triaxial compression tests. The results showed that the coated sands exhibit a state-dependent behavior similar to that of natural sands. Additionally, relationships between the initial state parameter, strength, dilatancy, and strength of the coated sands were established, providing a basis for future studies on coated granular materials.
Article
Engineering, Civil
Anh-Tuan Vu
Summary: The experimental study investigated the strength behavior of a coral gravelly sand from Vietnam under monotonic and cyclic loading. Shear strength parameters of the sand, including internal friction angle and apparent cohesion, were found to vary with relative density, cyclic load, amplitude of cyclic load, and loading rate. The shear strength increased with relative density and after cyclic loading, while the amplitude of cyclic load also influenced the shear strength. Loading rate had a minimal effect on the shear strength of the coral gravelly sand.
GEOMECHANICS AND ENGINEERING
(2021)
Article
Construction & Building Technology
Milad Shakiba, Seyed Mohammad Hosseini, Milad Bazli, Seyed Mohammad Reza Mortazavi, Mohammad Ali Ghobeishavi
Summary: In this experimental study, innovative anchorage systems made from glass fibre cloth and epoxy resin were used to enhance the bond behaviour between GFRP bars and concrete. The results showed that the anchor systems significantly increased the ultimate tensile load of GFRP bars in high-strength concrete.
MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Environmental
Akram Karimian, Mahmoud Hassanlourad
Summary: Microbially induced calcium carbonate precipitation (MICP) technique is an eco-friendly method for soil improvement, which enhances soil strength through cementation of sand particles. It has the potential to create stable bio-stabilized soil columns and produces homogeneous bio-cemented soil samples. In addition, there is no significant difference in the amount of calcium carbonate precipitation between sand and silty sand.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Construction & Building Technology
Diana Maria Paynor Balani, Mamoru Kikumoto, Ying Cui
Summary: This study investigated the effect of incorporating low-density polyethylene (LDPE) on sand behavior through consolidated-drained triaxial tests. The results showed that the addition of 1.5% to 2.0% LDPE content increased the peak strength of the sand by approximately 40%, but further increases in LDPE content led to a decrease in peak strength. Therefore, an LDPE content of 1.5% to 2.0% was identified as the optimal percentage for enhancing sand strength. The shear stiffness of the LDPE-mixed sand also decreased by 25-35% compared to unreinforced samples.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Environmental
Umme Salma Rima, Nicholas Beier
Summary: This paper evaluated the effects of natural dewatering processes such as multiple freeze-thaw cycles and evaporative drying on surface crust formation for a deep oil sands tailings deposit. Changes in temperature gradient, initial solids content, initial water chemistry, or treatment process can influence the freeze-thaw dewatering process. Overall, the results suggested that a combination of freeze-thaw and evaporative drying processes can contribute to surface crust formation.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Geological
Juan Du, Gang Zheng, Bingyang Liu, Ning-Jun Jiang, Jun Hu
Summary: This study demonstrates that the strength of cement-stabilized OMDS is lower than that of cement-stabilized non-organic sand, but with increasing confining pressure and curing time, the maximum and residue deviator stress, axial strain at failure, and elastic modulus also increase.
Article
Construction & Building Technology
Maximilian Schleiting, Kevin Klier, Niels Wiemer, Alexander Wetzel, Jan-Christoph Zarges, Hans-Peter Heim, Bernhard Middendorf
Summary: The use of micro fibres as reinforcement in Ultra-High Performance Concrete (UHPC) enhances its mechanical properties. To achieve an optimal bonding between fibre and cementitious matrix, a coating of fibres with a thermoplastic elastomer is proposed in this study. The pullout tests and flexural strength tests reveal that the coating improves the adhesive bond between fibre and UHPC matrix, but the results differ when inclined fibres are tested.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Marine
Lu Liu, Xiaofei Yao, Zhanpeng Ji, Hongmei Gao, Zhihua Wang, Zhifu Shen
Summary: Calcareous sand from the South China Sea shows higher liquefaction resistance compared to silica sand, with notable effects from changes in cyclic stress ratio and relative density. Differences in pore pressure generation characteristics and deformation responses between calcareous and silica sands were also observed.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Geological
Zhiyong Liu, Jianfeng Xue, Jianzhong Ye
Summary: The study showed that the stress history of soils affects the strain accumulation under cyclic loading, with greater lateral stress reduction leading to greater strain accumulation. The direction of strain accumulation after unloading roughly follows the modified Cam Clay flow rule, regardless of relative density and unloading stress paths. The study also found that the variation of strain accumulation direction is attributed to the change of average stress ratio resulting from lateral stress reduction.
Article
Metallurgy & Metallurgical Engineering
Ke Ma, Jin Liu, Can-hui Jiang, Xiao-fan Ma, Lan-hua Huang, Cheng-zong He, Chang-qing Qi
Summary: This study explores the potential use of polyurethane organic polymer and sisal fiber in improving the mechanical performance of sand. The results showed a significant increase in the compressive strength and tensile strength of the sand with the increase of polymer content, fiber content, and dry density. The combined use of polymers and fibers effectively prevents the propagation and development of cracks.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Construction & Building Technology
Shuo Feng, Huigang Xiao, Minglei Ma, Shengjin Zhang
Summary: The study investigated the effect of substrate surface roughness, fibre type, and water-to-binder ratio on the bond behavior between UHPC and NSC. Surface roughness was found to be the most critical factor, followed by water-to-binder ratio and steel fibre type. Different methods for evaluating surface roughness showed good consistency, and the bond strength enhancement was attributed to the compact transition zone and dowel effect.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Textiles
Ying Wang, Jin Liu, Zhihao Chen, Fan Bu, Yuxia Bai, Debi Prasanna Kanungo, Zezhuo Song, Changqing Qi
Summary: The compressibility and rebound properties of sand reinforced with polymer and fibers were studied using laboratory experiments. The results showed that the compressive coefficient decreased with increasing polymer content, while the resilient rate kept increasing. The compression coefficient decreased rapidly at first and then changed slowly with increasing dry density. Furthermore, the compressive coefficient increased with increasing fiber content, and the sand reinforced with sisal fibers had a higher resilient rate. The polymer formed a parallel connection model between sand particles and filled the pore between particles, while the fibers formed a spatial stereo structure within the sand, reducing the compression characteristics and increasing the resilience.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Materials Science, Characterization & Testing
Jin Liu, Xiao Shi, Changqing Qi, Zhihao Chen, Fan Bu, Wei Qian, Canhui Jiang, Xiaowei Lan, Zezhuo Song
Summary: The study investigated the effects of polyvinyl acetate polymer and sisal fiber as reinforcement materials on the mechanical behavior of poorly graded sand. It was found that increasing the polymer and fiber content can enhance the strength of the reinforced sand.
JOURNAL OF TESTING AND EVALUATION
(2021)
Article
Construction & Building Technology
Zezhuo Song, Jin Liu, Yuxia Bai, Xiao Shi, Debi Prasanna Kanungo, Changqing Qi, Fan Bu
Summary: This study investigates the shear-strength properties of polyurethane polymer-treated sand stored at different temperatures. The results show that the stress-strain relationship becomes more ductile with increasing temperature, and shear strength, energy absorption, and cohesion tend to decrease initially and then increase. The presence of a polymer matrix forms honeycomb and net structures among sand, resulting in improved strength properties depending on polymer content and dry density.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Yuxia Bai, Jin Liu, Yujun Cui, Xiao Shi, Zezhuo Song, Changqing Qi
Summary: The mechanical behavior of a PU polymer-sand mixture is affected by the content of PU polymer, dry density, and temperature. The strength, ductility, and stiffness of the material vary under different conditions, with positive and negative temperatures showing different effects on the treatment of PU.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Geological
Zezhuo Song, Jin Liu, Yongxiang Yu, Shefeng Hao, Bo Jiang, Jinglei Song, Debi Prasanna Kanungo, Shaorui Sun, Yuxia Bai
Summary: The addition of polyol prepolymer to clayey soil was found to enhance mechanical properties, frost resistance, and vegetation growth, thereby improving the ecological environment of rock-slope topsoil.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Environmental
Wenyue Che, Jin Liu, Hongyang Li, Chengzong He, Yuxia Bai, Zezhuo Song, Ying Wang, Wei Qian, Zhihao Chen
Summary: The study investigates the effects of an organic polymer reinforcement on the strength, failure behavior, and energy evolution of natural sand. The results show that increasing the polymer content and specimen density significantly improves the compressive strength. The polymer has a significant impact on the mechanical strength, failure behavior, and energy evolution of the sand.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Soil Science
Wenyue Che, Jin Liu, Shefeng Hao, Jinghua Ren, Zezhuo Song, Fan Bu
Summary: This study investigates the use of an eco-friendly biopolymer binder to enhance the cohesion and stability of topsoil. The results show that the modified sand exhibits improved mechanical properties and erosion resistance. The biopolymer binder provides a suitable environment for vegetation growth and ensures long-term stability of the modified slopes.
Article
Engineering, Environmental
Zi Wang, Jin Liu, Fan Bu, Wenyue Che, Zezhuo Song, Ke Ma, Wei Qian
Summary: Sandy bank slopes, commonly found near rivers and lakes, often exhibit desiccation cracking on their surfaces, posing detrimental effects on soil properties. This study investigated the influence of sand content on desiccation cracking and moisture dynamics in mixed soil under different temperatures. The results showed that incorporating sand improved the porosity of the soil, inhibiting crack formation. Additionally, adding sand prolonged the drying period by modifying the pathways of water migration. This research contributes to understanding crack formation in sandy slopes' topsoil.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Polymer Science
Chengzong He, Guochang Hu, Hong Mei, Xiaoyong Zhu, Jian Xue, Jin Liu, Faming Zhang, Wenyue Che, Zhihao Chen, Zezhuo Song
Summary: This paper investigates the stabilization benefits of adding polyvinyl acetate and attapulgite to clayey soil. The results show that both materials can increase the strength of the soil by improving cohesion and internal friction angle. Additionally, they enhance soil water retention, ensuring good vegetation growth under drought conditions.
Article
Soil Science
Fan Bu, Jin Liu, Hong Mei, Zezhuo Song, Zi Wang, Chengjiang Dai, Wei Qian
Summary: Climate variables such as rainfall and high temperature can influence the moisture and cracking of clayey soil, which can lead to environmental and geological disasters. This study investigates the impact of soil thickness, fiber content, and wetting-drying cycles on soil moisture evaporation and crack formation. The results show that a thicker soil layer can delay cracking but may lead to the development of wide cracks and shallow ditches. Sisal fibers can effectively reduce the development of cracks and maintain soil integrity.
SOIL & TILLAGE RESEARCH
(2023)
Article
Engineering, Geological
Yuxia Bai, Jin Liu, Henglin Xiao, Zezhuo Song, Ke Ma, Yongfeng Deng
Summary: Polymer treatment enhances soil slope protection by improving its macro-properties and promoting vegetation growth. Laboratory tests showed that adding polyurethane greatly increased the strength and water retention capacity of the treated soil, while reducing its permeability. Field observations demonstrated that polyurethane treatment effectively protected soil slopes by enhancing erosion resistance, mechanical strength, and water retention, leading to accelerated vegetation growth and cover.
ENGINEERING GEOLOGY
(2023)
Article
Polymer Science
Xufen Zhu, Jiaqiang Zheng, Yuliang Gao, Jian Xue, Guochang Hu, Wenyue Che, Zezhuo Song, Jin Liu, Tingwei Huang, Peng Wu
Summary: This study investigated the water retention properties, cracking resistance, and scouring resistance of biogel-amended clay. The results showed that incorporating biogel improved the water retention, cracking resistance, and scour resistance of the clay samples. The addition of biogel enhanced cohesion between soil particles, reduced crack formation and development, and improved water retention.
Article
Engineering, Civil
Jin Liu, Wenyue Che, Xiaowei Lan, Mengyuan Hu, Mengyao Qi, Zezhuo Song, Mengya Sun, Miao Jing, Wei Qian, Changqing Qi
Summary: In this study, a novel method of stabilizing natural soil using locust bean gum (LBG) was proposed, leading to enhanced strength properties. Laboratory tests were conducted on specimens with varying biopolymer contents and curing durations. The LBG treatment significantly improved the mechanical strength of the natural soil, with compressive, shear, and tensile strength increasing as the biopolymer content increased. The bonding between soil particles was altered by the sol-gel film formed by LBG, resulting in improved macrofailure characteristics and increased failure path and ruptures plane unevenness. The increased curing duration further enhanced the interparticle interaction and strengthened the biopolymer bonds, leading to improved mechanical properties. The formation of large stable aggregates with widely structured bonding groups explained the enhanced effect of the LBG binder on soil strength.
TRANSPORTATION GEOTECHNICS
(2023)
Article
Construction & Building Technology
Yuhan Feng, Hongyan Zhao, Jin Liu, Zezhuo Song, Wenyue Che, Ke Ma, Ying Wang
Summary: This paper investigates the effects of a self-developed porous organic polymer material (SPOP) on the mechanical properties and microstructure of treated sand under wetting-drying cycles. The results show that the addition of SPOP significantly enhances the mechanical strength, elastic modulus, and cohesion of the sand. The mechanical properties initially increase and then decrease with the increase of SPOP content, peaking at 3% SPOP content. Wetting-drying cycles have a significant impact on the mechanical properties, with a decrease in performance as the number of cycles increases.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Environmental Sciences
Jin Liu, Zi Wang, Guochang Hu, Jian Xue, Fan Bu, Miao Jing, Zezhuo Song, Wenyue Che
Summary: This study introduces two effective and sustainable materials, microbial biopolymer (MB) and palm fibers (PF), for cracking and erosion control in sand-clay mixtures. The results showed that MB could significantly improve the resistance of the soil to cracking and scouring, and the improvement increased with increasing MB content. Additionally, PF positively affected the anti-crack and antierosion properties of the soil.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
