Chongzhi Tu

Research on the Improvement Effect of Asphalt Mixture Workability Based on Uniform Material Distribution

Gongying Ding, Bei Chen, Heng Zuo, Chongzhi Tu

Asphalt mixture workability (WAM) is critical for quality control during asphalt pavement construction. However, the methods to improve mixing quality and the impact of such improvements on material distribution uniformity remain unclear. This study aims to identify WAM enhancement strategies and explore …

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Finite element analysis of bearing capacity and cracking failure in semi-flexible pavement materials

Heng Zuo, Gongying Ding, Qiang Ye, Meng Yuan et autres

Abstract Semi-flexible pavement (SFP) materials are known for their outstanding rutting resistance; however, their applications to new pavements are limited due to uncertainties in their structural bearing capacity and cracking behavior. In this respect, the structural performance and meso-scale cracking failure of …

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Comparative Analysis of Water Vapor Accumulation and Permeation Diffusion Processes in Asphalt Mixtures

Chongzhi Tu, Xinjun Hu, Heng Zhang

Accumulation-type water vapor transport (hereafter referred to as AT-WVT) and permeation-type water vapor transport (hereafter referred to as PT-WVT) represent two fundamental modes of water vapor diffusion in asphalt mixtures, exerting distinct impacts on asphalt pavement durability. In this study, the diffusion …

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Study on Sustainable Sludge Utilization via the Combination of Electroosmotic Vacuum Preloading and Polyacrylamide Flocculation

Heng Zhang, Chongzhi Tu, Cheng He

Dredged sludge is characterized by a high water content, low permeability, and poor load-bearing capacity, which hinder its sustainable utilization as an engineering filler. During the stabilization process using vacuum preloading (VP), fine-grained sludge readily clogs drainage channels, thereby prolonging consolidation duration …

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Analysis of nonlinear viscoelastic response of asphalt through multiple stress creep recovery test

Lei Xi, Qiang Ma, Henglin Xiao, Weiqing Lin et autres

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Selecting the Optimal Calculation Method and Chemical Reagents in Surface Energy Tests of Asphalt Materials

Chongzhi Tu, Gongying Ding

In surface energy tests of asphalt materials, the inaccuracy of the calculation method (e.g., least squares (LS)) and the arbitrary selection of chemical reagent combinations lead to unstable results, threatening the quantitative evaluation of asphalt-aggregate adhesion durability. This study addresses these two …

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Experimental study on synergistic effects of electroosmosis and CaCl2 on inhibiting the expansion behaviors of sodium sulfate saline soil

Heng Zhang, Shaohua Lu, Chongzhi Tu, Lingfeng Guo

The fundamental cause of frost heave and salt expansion of saline soil is the water condensation and salt crystallization during the freezing process. Therefore, controlling the water and salt content is crucial to inhibit the expansion behaviors of saline soil. Recently, electroosmosis …

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Performance Evaluation of Desulfurized Rubber Powder and Styrene-Butadiene-Styrene Composite-Modified Asphalt

Bin Liu, Kai Zhang, Xiangyang Fan, Chongzhi Tu

Rubber powder asphalt has been widely studied due to its favorable temperature sensitivity and fatigue resistance. However, because rubber powder does not easily swell in asphalt, it leads to poor storage stability and high viscosity, limiting its large-scale application. In this study, …

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Upscaling prediction of dynamic compressive viscoelastic properties of asphalt mortar from asphalt mastic

Sheng Liang, Ziyang Liu, Jun Zhan, Menghui Liao et autres

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Experimental Investigation on the Improvement of Dredged Sludge Using Air–Booster Vacuum Preloading with Polyacrylamide Addition

Heng Zhang, Lingfeng Guo, Chongzhi Tu

Reducing the water content in soft soil is crucial for improving its load-bearing capacity. However, traditional vacuum preloading demonstrates limited effectiveness for dredged sludge due to its high water content and low permeability, resulting in inadequate consolidation and long treatment durations. To …

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Determining the Size of Representative Volume Elements for a Two-Dimensional Random Aggregate Numerical Model of Asphalt Mortar without Damage

Sheng Liang, Jing Tao, Xiaoming Zhao, Zhong Liu et autres

The size of the representative volume element (RVE) for the two-dimensional (2D) random aggregate numerical model of asphalt mortar in a non-destructive state, which directly affects the time required to simulate the linear viscoelastic behavior from asphalt mastic to asphalt mortar. However, …

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Effects of Oxygen Isolation and Light–Oxygen Coupling Ultraviolet Aging on Adhesion, Micromorphology, and Functional Groups of Warm-Mix Asphalt

Yongning Wang, Bo Li, Dongna Li, Dingbang Wei et autres

To investigate the water damage effects and aging mechanism of warm-mix asphalt (WMA) after oxygen isolation and light–oxygen coupling ultraviolet (UV) aging, contact angle and adhesion performance tests were performed. The UV aging mechanism of WMA was analyzed using Fourier transform infrared …

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