Article
Green & Sustainable Science & Technology
Cameron Hopkins, Donald Cameron, Md Mizanur Rahman
Summary: The study aims to improve the properties of existing materials through additives for in situ recycling to enhance road adaptability. Laboratory characterizations show improved hydrophobicity, enhanced drainage, and increased strength. In situ recycling is adaptive, cost-effective, and sustainable with higher plasticity and adaptability.
Article
Engineering, Geological
Qi Zhang, Yujun Cui, Zhigang Cao, Yuanqiang Cai, Chuan Gu, Jun Wang
Summary: This study investigates the influence of fines and matric suction on the plastic creep limit of road base aggregate. The results show that the plastic creep limit is affected by the presence of fines, with a decrease observed for low fines content and an increase for high fines content. A method for predicting the plastic creep limit based on standard monotonic triaxial tests and post-cycle monotonic triaxial tests is proposed. This method can be applied to road base aggregate with different fines contents and matric suctions.
ENGINEERING GEOLOGY
(2022)
Article
Construction & Building Technology
Arieh Sidess, Jacob Uzan, Piere Nigem
Summary: The study investigates the resilient behavior of an unbound base material and reveals that the material parameters are sensitive to the type of loading, with different functions observed between incremental loading tests and resilient modulus tests.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2021)
Article
Engineering, Geological
Ashutosh Kumar, Arash Azizi, David Geoffrey Toll
Summary: This paper presents a suction monitoring setup for soil cyclic triaxial testing and its application to evaluate soil water retention and volumetric response. The results show that the soil water retention and volumetric response are influenced by factors such as suction level, stress levels, and degree of saturation.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2022)
Article
Construction & Building Technology
Guoyang Lu, Haopeng Wang, Yuqing Zhang, Pengfei Liu, Dawei Wang, Markus Oeser, Jurgen Grabe
Summary: This study investigates the impact of pore-water pressure generated by intermittent dynamic vehicle loading under various saturation states on permeable pavement structures, specifically the behaviour of the UGB layer. By constructing a full-scale test track with embedded sensors and utilizing the SAME model, the study characterizes the dynamic response and water distribution within the UGB layer, providing insights into the influence of saturation conditions on the pavement structure's behaviour. The proposed model's predictions align with field measurements, allowing for estimation of the water content's impact on the resilient modulus distribution within the UGB layer and proposing sensitivity analysis for the stress state of the UGB layer.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2022)
Article
Engineering, Geological
Fang Zheng, Shengjun Shao, Yongxin Wang, Shuai Shao
Summary: A new suction-controlled true triaxial apparatus was developed to investigate unsaturated soil behavior under multiaxial stress paths. The device features a mixed-boundary design, allowing for effective suction-controlled experiments and avoiding loading boundary interference. The suitability of the apparatus for testing remolded loess was validated through repeated trial tests, demonstrating its potential for research in this area.
GEOTECHNICAL TESTING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Dusan Stehlik, Petr Hyzl, Ondrej Dasek, Ludek Malis, Robert Kaderka, Radek Komenda, Jiri Sachr, Petr Vesely, Karel Spies, Michal Varaus
Summary: In addition to conventional laboratory tests, the correct design of pavement structure requires frequent functional tests of input materials and mixtures. This study summarizes findings from long-term monitoring of low-traffic road sections and highlights the importance of dual-axis deflection measurement for identifying low bearing capacity pavement sections.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Physical
Wenjun Hua, Qunding Yu, Yuanjie Xiao, Wenqi Li, Meng Wang, Yuliang Chen, Zhiyong Li
Summary: Existing regression models for unbound granular materials (UGMs) fail to consider the complexity of plastic deformation accumulation behavior influenced by factors other than the number of loading cycles and stress levels. In this study, an artificial-neural-network (ANN)-based prediction model was developed, which outperformed previously published regression models in accuracy and reliability. The two major factors influencing the magnitude of accumulated plastic deformation were the shear stress ratio and the number of loading cycles.
Article
Chemistry, Physical
Qishu Zhang, Wuming Leng, Bin Zhai, Fang Xu, Junli Dong, Qi Yang
Summary: This study investigates the dynamic stability of unbound granular materials used in railway subgrades through large-scale cyclic triaxial tests. The results show that moisture content, confining pressure, and dynamic deviator stress have strong correlations with the accumulation of plastic strain and cycle number curve patterns. Grey relational analyses demonstrate that these factors play similar roles in determining the behavior of the material under dynamic loading. A data processing method using a neural network is developed to analyze test data and evaluate the critical dynamic stress and accumulative plastic strain of the material, showing linear/non-linear relationships with respect to different stress parameters.
Article
Engineering, Environmental
Shuai Shao, Shengjun Shao, Jiao Wang
Summary: Loess is a typical structural unsaturated soil, and matric suction is identified as the main factor affecting its properties. Research shows that the compression yield characteristics of loess are influenced by matric suction, and conducting true triaxial tests under complex stress states can provide valuable insights into its properties.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Construction & Building Technology
Mohammad Shafiqur Rahman, Sigurdur Erlingsson, Abubeker Ahmed
Summary: This study modified a permanent deformation (PD) model for unbound granular materials (UGMs) in pavements to better suit field conditions and software applications. The model was calibrated and validated using multi-stage repeated load triaxial tests for UGMs with different moisture contents, and showed improved predictions compared to existing models.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Construction & Building Technology
Ali Alnedawi, Kali Prasad Nepal, Riyadh Al-Ameri
Summary: This study investigated the influence of loading frequencies on the permanent deformation of UGMs, using RLTT to test the impact of three frequencies (0.2, 0.33, and 0.5 Hz) on basalt and granite. The experimental results showed that these loading frequencies had minimal effect on the tested materials under specific conditions, suggesting that increasing frequency could significantly reduce the testing duration of RLTT. By utilizing regression and ANN modelling, it was found that loading frequency only accounted for 3% of the importance on the PD of the tested UGMs compared to other factors.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2021)
Article
Engineering, Geological
Zhigang Cao, Xingchi Ye, Chuan Gu, Yuanqiang Cai, Jun Wang
Summary: In this study, the thermal-induced changes in the shear characteristics of unbound granular materials (UGMs) were investigated. The thermal dependence of various strength parameters was examined under different temperatures, initial mean effective stresses, and relative compaction levels. The results showed that dense UGMs exhibited expansion during heating and slight contraction during cooling, with the thermal deformation attributed to the movement and rotation of soil particles.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Salamat Ullah, Arshad Jamal, Meshal Almoshaogeh, Fawaz Alharbi, Jawad Hussain
Summary: This study investigated the resilience characteristics of unbound granular materials using the repeated load triaxial test, and found that moisture content, material gradation, and stress level significantly affect the resilient modulus. A linear model was developed to predict the change in resilient modulus with moisture content, and an improved modified Uzan stress moisture model was proposed. The research provides a benchmark for validating other numerical data.
Article
Computer Science, Interdisciplinary Applications
Guoqing Cai, Bowen Han, Annan Zhou, Jian Li, Chenggang Zhao
Summary: A bounding surface model is established in this study to accurately describe the stress-strain relationship of unsaturated soil with constant matric suction. By introducing the concept of fractional accumulated strain rate and using the movable mapping centre rule, the cyclic loading history and hysteresis characteristics of the dynamic stress-strain curve are considered, resulting in a reasonable description of the curve shape.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Geological
Negin Zhalehjoo, Didier Bodin, Geoffrey Jameson, Andrew Papacostas, Ross Guppy
Summary: Foamed bitumen stabilization is a sustainable solution for construction and rehabilitation of pavements, and it improves pavement performance. This paper focuses on the development of a fatigue relationship for Foamed bitumen stabilized (FBS) materials, which will assist in thickness design of FBS flexible pavements.
GEOTECHNICAL TESTING JOURNAL
(2024)
Article
Engineering, Geological
Alejandra Lopez Ramirez, Yinning Zhang, Juha Forsman, Leena Korkiala-Tanttu
Summary: This paper presents the results of an extensive testing program on the stabilization of Finnish soft clay using low emissions binders. The alternative binders, including by-products and pozzolanas, showed higher strength than traditional binders at various densities. Additionally, a simplified CO2 emissions calculation procedure for DDM design and different emissions factors for the investigated binders were proposed.
GEOTECHNICAL TESTING JOURNAL
(2024)
Article
Engineering, Geological
Ashray Saxena, V. Vinay Kumar, Natalia S. Correia, Jorge G. Zornberg
Summary: Reclaimed asphalt pavement (RAP) is widely used in road construction due to its economic and environmental benefits. This study evaluates the millability and recyclability of asphalt layers with paving interlayers (GRAP). It finds that GRAP can be reused in base and surface courses, leading to sustainable roadway construction practices.
GEOTECHNICAL TESTING JOURNAL
(2024)
Article
Engineering, Geological
Buddhima Indraratna, Chathuri M. K. Arachchige, Cholachat Rujikiatkamjorn, Ana Heitor, Yujie Qi
Summary: This article discusses the recycling of waste materials produced in the coal and steel industry as well as the reusing of waste tires, which is a high priority in Australia's urban infrastructure development for environmental preservation. The practical applications of these waste materials in coastal reclamation and road and rail construction are presented, along with comparisons to traditional quarried materials. The research outcomes demonstrate that properly engineered waste mixtures can exceed current technical standards and reduce maintenance intensity, supporting sustainable solutions for future transportation infrastructure development.
GEOTECHNICAL TESTING JOURNAL
(2024)