Recent Adopted

Performance Evolution Mechanism of Ultra-High Content Rubberized Asphalt from a Macro Micro Perspective: A Comparative Study of Desulfurized vs. Non Desulfurized Rubber Modified Asphalt

蔺斌 , FENG Changman , YANG Zhaodong , FANG Chenyu , ZHENG Huayu , Zhou Kexue

Adopted date: March 18,2026

[Abstract](66) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Rubber-modified asphalt mixtures serve as paving materials capable of effectively reducing traffic noise and enhancing pavement durability. However, conventional non-devulcanized rubber-modified asphalt suffers from issues such as poor high-temperature storage stability and susceptibility to segregation and sedimentation, which limit the efficient utilization of waste tires. To overcome the restrictions on crumb rubber content, this study prepared two types of asphalt modified with internal crumb rubber contents as high as 40% to 50%, using two distinct types of rubber powder (non-devulcanized and devulcanized), via specialized colloidal milling equipment. The macro- and micro-performance evolution mechanisms of these materials were systematically investigated. Techniques including Dynamic Shear Rheometer (DSR), Bending Beam Rheometer (BBR), X-ray Photoelectron Spectroscopy (XPS), and Fourier Transform Infrared Spectroscopy (FTIR) were employed to compare and analyze the rheological properties and chemical structures of the two material types. Results indicate that non-devulcanized rubber asphalt (LH), under physico-chemical synergistic effects, significantly enhances high-temperature performance, with its complex shear modulus and rutting factor surpassing those of devulcanized rubber asphalt (TL). However, LH exhibits higher low-temperature creep stiffness and relatively weaker crack resistance. In contrast, TL, due to the cleavage of sulfur bonds, shows a slight decrease in high-temperature performance but demonstrates superior low-temperature ductility and workability. Microscopic analysis further confirmed the formation of C–S and S–S chemical bonds in LH, indicative of chemical cross-linking characteristics, whereas TL primarily relies on physical dispersion. This research elucidates the performance regulation mechanisms of rubber-modified asphalt under ultra-high crumb rubber content, providing theoretical support and a technical pathway for the engineering application of low-noise, high-durability asphalt pavements.

Force Analysis of Asphalt Pavement Structure in Expressway Reconstruction and Expansion Project

蔡燕霞吴江昊李琛琛 , WU Jiang-hao , LI Chen-chen , YANG Jie

Adopted date: March 17,2026

[Abstract](100) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
In the reconstruction and expansion projects of expressways, the vertical splicing surface of the structural layer is the key and difficult point in the design. The quality of its stress state is related to the safety of the pavement structure and has an intrinsic connection with the tensile stress of the water-stabilized layer of the new and old roads. ......

A Review on Performance and Modification Mechanism of Dry Polymer Modified Asphalt Mixtures

Weiwei Lu , Jiang Ruiyao , Zhao Peng , Jin Duo , Lv Songtao , Duan Haihui

Adopted date: March 09,2026

[Abstract](59) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
To clarify the research progress and status of the road performance and action mechanism of dry polymer modified asphalt mixture, identify the knowledge gaps and technical bottlenecks in current research, and promote the innovative development and promotion and application of dry polymer modification technology in road engineering, this paper reviews the relevant research on dry polymer modified asphalt mixture at home and abroad. First, the types of dry polymers and the preparation process of their mixtures were systematically sorted out, and the optimization method for the preparation of dry modified asphalt mixtures was proposed; then, the road performance and action mechanism of dry polymer modified asphalt mixtures were summarized and analyzed, and the recommended method for improving its performance was provided; finally, the current research challenges and future development directions were proposed. The research results show that the dry preparation process of polymer modified asphalt mixture can significantly reduce production costs and energy consumption and simplify the process flow compared with the wet preparation process; the high-temperature stability of dry polymer modified asphalt mixture is generally better than that of wet process, and the low-temperature bending failure strain can also reach or exceed the level of wet mixture; the modification mechanism of dry polymer is mainly physical modification, which forms a network structure through the melting, flow and fusion of the modifier, and there is no chemical change in the modification process; dry polymer modification still has research and application challenges in terms of compatibility with asphalt and long-term performance attenuation caused by polymer aging and degradation. Future research should focus on solving these problems and promoting the standardization and large-scale application of dry technology.

Experimental Study on Direct Compression Shear Resistance of Stainless steel Core Plate Members for Highway Projects

颜东煌 , YU Jie , XU Hongsheng , PAN Quan , ZHANG Chao , WU Jiadong

Adopted date: May 12,2025

[Abstract](395) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
In order to explore the failure mechanism of lateral shear damage of stainless steel core plate for highway engineering, and to solve the problem of lack of test data support in the actual engineering needs, this study carried out two groups of different specifications of 2×3 core plate sandwich structure specimens straight compression shear test, and constructed a finite element numerical model to verify and analyze the test results. The test results show that the stainless steel core plate shear test curve presents a typical three-stage evolution characteristics, divided into elastic stage, elastic-plastic stage and plastic damage stage; the structural failure mode is manifested as the pipe end wrenching edge region corner and pipe end pressure region preferentially occurs local buckling, followed by the core pipe gap at the panel of local instability bending; the shear performance of stainless steel core plate with the increase of the thickness of the panel is significantly improved, 8mm thickness of the core plate shear strength, 8mm thickness of the core plate shear strength. The shear performance of the stainless steel core plate increases significantly with the increase of panel thickness, and the shear strength, extreme shear strength and shear modulus of elasticity of the core plate with 8 mm thickness are improved by 39.4%, 15.7% and 32.7%, respectively, compared with that of the core plate with 6 mm thickness. The numerical simulation is basically consistent with the test results, effectively verifying the accuracy of the finite element model parameter selection and modeling scheme. The lateral shear load capacity of the stainless steel core plate is greatly affected by the relative relationship between the panel thickness, core tube wall thickness, and outer diameter, etc. Its shear ultimate load capacity increases significantly with the increase of panel thickness, core tube wall thickness, and outer diameter, and decreases slowly with the increase of core tube height and spacing.

High-Modulus Utilization and Toughness Enhancement of Recycled Asphalt

Jiangbo , LIU Ziyang , GAO Jucai , JING Longfei , CHEN Yu

Adopted date: July 13,2026

[Abstract](7) [HTML](0) [PDF 0.00 Byte](20)

Abstract:
To exploit the potential of reclaimed asphalt binders (RAHM) as high-modulus components while mitigating their severe low-temperature brittleness, the performance-enhancing mechanisms of styrene-butadiene rubber (SBR) on reclaimed high-modulus asphalt systems were investigated in this study. An SBR composite-modified reclaimed high-modulus asphalt was prepared using a three-stage process. Its rheological and fracture behaviors across the entire temperature domain were systematically evaluated th

Elimination of Surface Roughness Effect in VSM Based on Newmark-β Method

郭伟伟 , Xu Lijun , Luo Hui

Adopted date: March 18,2026

[Abstract](31) [HTML](0) [PDF 0.00 Byte](97)

Abstract:
Based on the vehicle-bridge coupling theory, dynamic information of bridge structures can be extracted from vehicle responses, enabling subsequent damage identification and other analyses. However, this method is significantly influenced by road roughness, which may impede the extraction progress. This study proposes a method to mitigate the effects of surface roughness. Initially, an analytical solution is derived for vehicle responses that considers the effects of roughness, demonstrating that the roughness effect is independent of the vehicle-bridge interaction. The proposed method for eliminating roughness involves two steps. In the first step, an additional mass method is employed for roughness identification. In the second step, the surface roughness effect on the vehicle is iteratively resolved using the Newmark-β method, followed by modifications to the vehicle response to eliminate the roughness effect. Numerical study revealed that the proposed method significantly reduced the effect of surface roughness, and high order of bridge frequencies can be extracted with VMD method. An experimental validation was conducted, and the modified vehicle response closely matched the response without roughness, a vehicle with lower frequency will enhance the performance of the proposed method, while the existence of bridge damage has little effect on the method.

Research on Parameters of Bridge Moving Vehicles Load Based onWOA-BP Neural Network

WANG Xiao-hui , ZHANG Bang-ru , TAO Zhi-ren , CHI Xin-yan , WAN Li-xing , PENG Jian-xin

Adopted date: March 12,2025

[Abstract](385) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
In this paper, for efficient and accurate identification of moving load parameters on bridge structures. A hierarchical identification method for bridge moving loads based on whale algorithm (WOA) BP neural network is proposed, and a motion load parameter recognition model based on WOA-BP neural network is constructed. Through the moving load recognition model, the lanes, speeds, and vehicle loads of vehicles on the bridge are identified step by step and coupling. Under the background of a prestressed simply supported box girder bridge project, the performance of the proposed method and neural network recognition model is verified by the dynamic response measured data under random traffic flow and combined with the video data of vehicle driving on the bridge. The results show that the proposed method can be applied to the study of bridge moving load identification, and the moving load recognition model has high recognition accuracy, fast convergence speed, strong robustness and noise resistance, and can accurately identify bridge moving load parameters.

Numerical simulation analysis of slope reinforcement effect by inclined and vertical pile under overloading at the top of slope

Chenemei , Lihongshun , Yanzongsong , Minjiangang , zhanglei , Yangxufeng , Wangchuangye

Adopted date: March 12,2025

[Abstract](118) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
To study the effect of slope reinforcement by inclined piles under overloading at the top of slope, the Flac3D was used in this paper to establish a numerical analysis model, considering the pile soil interaction, and based on the strength reduction method to discuss the influence of pile inclination and location on slope stability, and compares and analyzes the difference of horizontal displacement and bending moment changes between inclined piles and straight piles under overloading at the top of slope. The results indicate that: (1) As the inclination of the "negative inclination" anti-slip pile increases, the slope stability coefficient increases, and the horizontal displacement and bending moment decrease. (2) The horizontal displacement and bending moment of the "negative inclination" anti-slip pile vary with the depth of the pile and the overload at the top of the slope, which is consistent with that of the straight pile. The horizontal displacement decreases with increasing depth and increases with increasing overload at the top of the slope, with the maximum growth rate at the top of the pile. The bending moment of the pile body first increases and then decreases along the length of the pile, and the maximum bending moment occurs near a depth of 0.58L. (3) In practical engineering, anti-slip piles can be set to a "negative inclination" to enhance their bending resistance. Setting it in the upper part of the slope has a better effect.

Analysis of installation method and error control of steel girder of steel-concrete composite girder cable-stayed bridge

Xiong Xian Yong , Fu Ya Jun , Huang Gen

Adopted date: March 12,2025

[Abstract](104) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Abstract: The installation of steel girder of steel-concrete composite beam cable-stayed bridge is more complicated than that of steel girder cable-stayed bridge, and it is more difficult to control the installation error of girder. In this paper, the double-sided box-section composite beam is taken as the research object, the finite element model is established to compare and analyze the installation methods of the steel girder of the composite beam, the best installation method is selected according to the principle of safe stress, the causes of the installation errors of the steel main beam are analyzed, and the corresponding error control methods are put forward.

Optimization of bridge life cycle maintenance decision based on LCA and LCC

Liu Shuguang , Zhang Zefeng , Liu Yonghua , Wang Fan

Adopted date: March 12,2025

[Abstract](344) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
In order to study the optimal maintenance strategy for the whole life cycle of bridges under the influence of life cycle environment and life cycle cost factors, preventive maintenance and substantive maintenance are used as the basic maintenance methods, and bridge reliability, life cycle environment and life cycle cost are the goals. function, a multi-objective optimization model of bridge life cycle maintenance decision-making is established. The quantitative methods of bridge time-varying reliability, life cycle environment and life cycle cost indexes are deduced, and the calculation process of bridge life cycle maintenance decision optimization problem based on genetic algorithm is determined. Taking a prestressed concrete continuous T-beam bridge as an example, the optimal maintenance strategy set for the bridge is analyzed. Studies have shown that implementing preventive maintenance can effectively improve the reliability probability of bridges and reduce the number of substantive maintenance, while reducing life cycle costs and environmental impacts; earlier implementation of preventive maintenance and shorter maintenance cycles can reduce substantial maintenance. The number of preventive maintenance can be reduced, and the cost and environmental impact can be reduced; the implementation of preventive maintenance can better extend the time for the first implementation of substantive maintenance, and can delay the reduction of reliability indicators.