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Acta Mechanica Solida Sinica 2014年第3期27卷 306-314页

作者： Jun Wu Xinhua Yang Fan Bai Department of Mechanics Huazhong University of Science and Technology

According to the elastic-viscoelastic correspondence principle, an elastic microme- chanical framework taking the inclusion-matrix interface effect into account is extended for predicting viscoelastic properties of asphalt mixture, which is simply treated as elastic coarse aggregate inclusions periodically and isotropically embedded in a viscoelastic asphalt mastic matrix. The Burgers model is adopted for characterizing the matrix mechanical behavior, so that the homogenized relaxation modulus of asphalt mixture in compression creep is derived. After a series of uniaxial compression creep tests are performed on asphalt mastic in different temperature and stress conditions in order to determine the matrix constitutive parameters, the framework presented is validated by comparison with the experiment, and then some predictions of uniaxial compression creep behavior of asphalt mixture in different temperature and stress conditions are given.

关键词： asphalt mixture micromechanics elastic-viscoelastic correspondence principle compression creep

Microstructure modeling and virtual test of asphalt mixture based on three-dimensional discrete element method

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Journal of Central South University 2016年第6期23卷 1525-1534页

作者：马涛张德育张垚赵永利黄晓明 School of Transportation Southeast University Nanjing 210096 China Department of Civil and Environmental Engineering Rutgers the State University of New Jersey N J 08854 USA School of Civil Enginerring and Architecture Nanjing Institute of Technology Nanjing 211167 China

The objective of this work is to model the microstructure of asphalt mixture and build virtual test for asphalt mixture by using Particle Flow Code in three dimensions(PFC^(3D))based on three-dimensional discrete element method.A randomly generating algorithm was proposed to capture the three-dimensional irregular shape of coarse *** then,modeling algorithm and method for graded aggregates were *** on the combination of modeling of coarse aggregates,asphalt mastic and air voids,three-dimensional virtual sample of asphalt mixture was modeled by using PFC^(3D).Virtual tests for penetration test of aggregate and uniaxial creep test of asphalt mixture were built and conducted by using PFC^(3D).By comparison of the testing results between virtual tests and actual laboratory tests,the validity of the microstructure modeling and virtual test built in this study was ***,compared with laboratory test,the virtual test is easier to conduct and has less *** is proved that microstructure modeling and virtual test based on three-dimensional discrete element method is a promising way to conduct research of asphalt mixture.

关键词： asphalt mixture microstructure modeling virtual test discrete element method three-dimensional method

A methodology of implementing target mixing ratio for asphalt mixture

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Frontiers of Structural and Civil Engineering 2017年第3期11卷 308-314页

作者： Yucheng HUANG Lun JI Rui WEN Ming ZHANG National Center for Materials Service Safety Joint USTB-Virginia Tech Lab on Multifunctional Materials University of Science and Technology Beijing Beijing China Virginia Tech Blacksburg VA 24061 United States School of Transportation Science and Technology Harbin Institute of Technology Harbin China Shanghai Investigation Design & Research Institute CO. LTD Shanghai China Highway Administration Bureau of Liaoning Provincial Communications Department Harbin China

In order to implement the objective mix design of hot mix asphalt adequately during the construction process, the significance of objective mixing ratio was elaborated, and the variability of materials and its control method were analyzed. An engineering example is used to illustrate the debugging process of asphalt mixture batching ＆ mixing plant and the dynamic quality management methods. The results show that the set of methods can not only implement the objective mixing ratio of hot mix asphalt adequately, but also control production during the construction process effectively.

关键词： asphalt mixture target mixing ratio mix design implementation batching & mixing plant debugging

A study on fatigue damage different compaction using characteristics of asphalt mixture under 3D-microstructural

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Frontiers of Structural and Civil Engineering 2017年第3期11卷 329-337页

作者： Jing HU Pengfei LIU Bernhard STEINAUER Institute of Highway Engineering RWTH Aachen University D52074 Aachen Germany

The aim of this paper is investigating the microstructural characteristics of asphalt mixture under different compaction powers. In order to achieve this aim, a test track was built to provide asphalt mixture specimens and X-ray computed tomography （XCT） device was used to scan the internal structure. The aggregate particles and air-voids were extracted using Digital Image Processing （DIP）, so the relationship between compaction and air-voids was determined at first, and then, the effect of aggregate particles on the morphology of air-voids can be evaluated, finally, fatigue properties of asphalt mixture with different air-void ratio were measured by indirect tensile fatigue test as well. The research results release the distribution ofmicrostructures in asphalt pavement. 3D fractal dimension is an effective indicator to quantize the complexity of aggregate particles and air-voids; suffering the same compaction power, aggregates cause different constitutions of air-voids in asphalt mixture; investigation in this paper can present the essential relationship between microstructures and fatigue properties.

关键词： asphalt mixture microstructure morphology digital image processing fatigue damage

Bamboo Fiber Modified asphalt mixture Proportion Design and Road Performances Based on Response Surface Method

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Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 156-170页

作者：李海滨 SUN Jianmei WANG Sirui ZHANG Mingming HU Yihong SHENG Yanping School of Architecture and Civil Engineering Xi’an University of Science and TechnologyXi’an 710054China Shaanxi Transportation Holding Group Co. Ltd.Xi’an 710064China School of Material Science and Engineering Chang’an UniversityXi’an 710064China

In order to comprehensively utilize the remaining bamboo residue of bamboo products,this paper presents a research on recycling the bamboo fibers from bamboo residue for improving the performance of the asphalt *** of all,the basic performance parameters of sinocalamus affinis fiber,phyllostachys pubescens fiber,green bamboo fiber were tested and analyzed,and the optimal content and length were put ***,the mix ratio design of the bamboo fiber modified asphalt mixture was further designed through the response surface method,and was verified the rationality of the mix ***,the mixture specimens were made according to the experimental design mix ratio,and the high temperature,low temperature performance and moisture susceptibility of the bamboo fiber modified mixtures asphalt were *** results showed that the high temperature performance,low temperature performance and moisture susceptibility of bamboo fiber modified asphalt mixtures were improved compared with the performance of SBS modified asphalt *** the length of bamboo fiber is 7.25 mm and the content of 0.22%,the road performance of the asphalt mixture was ***,the decomposition of bamboo residue into bamboo fiber and its application in asphalt pavement can improve the reuse of bamboo waste,with remarkable environmental benefits and great promotion value.

关键词： bamboo fiber response surface method asphalt mixture proportion design road performances bamboo waste

High-Temperature Deformation and Low-Temperature Fracture Behavior of Steel Slag Rubber asphalt mixture Surface Layer

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Journal of Renewable Materials 2022年第2期10卷 453-467页

作者： Zhiqiang Shu Jianmin Wu Shi Chen Shan Yi haoqing Li Key Laboratory of Special Area Highway Engineering of Ministry of Education Chang’an UniversityXi’an710064China China State Railway Investment Construction Group Co. Ltd.Beijing102600China

Steel slag is regarded as one of the most widespread solid by-products of steel smelting with little commercial *** can play a vital role in the construction industry especially in the field of transportation infrastructure ***,there are few evaluation systems established on the high-temperature deformation and low-temperature fracture behavior of steel slag rubber asphalt mixture(SSRAM).This study explores the perfor-mance of SSRAM by uniaxial penetration test,Semi-Circular Bending(SCB)test and evaluates test data through regression *** uniaxial penetration test results shows that the failure deformation of SSRAM increases with the increase of steel slag *** to the minimum allowable permanent deformation(R TS-min),the deformation of SSRAM should be controlled within 3 ***,the cracking index of the SSRAM surface layer calculated at low temperature can meet the design *** SCB test results show that the stress peak degradation rate(specimens with 10 mm notch are compared with 0 mm)of SSRAM with 40%steel slag content is 20.04%.That means proper steel slag content makes the stress peak degradation rate of SSRAM reaches the lowest *** calculation results of fracture energy density(J_(1C))show that the steel slag additive reduced the fracture energy density of ***,it is still proved that SSRAM with 40%steel slag has the best low-temperature fracture performance based on critical fracture toughness(K_(1C))and fracture stress ***-more,the crack propagation velocity parametric equation of SSRAM is proposed through fracture mechanics theory and the increase of velocity is *** the high-temperature deformation resistance and low-temperature fracture property,the SSRAM surface layer with 40%steel slag content showed a batter application potential.

关键词： Steel slag asphalt mixture uniaxial penetration test SCB test deformation resistance crack propagation velocity

Numerical simulation of asphalt mixture based on three-dimensional heterogeneous specimen

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Journal of Central South University 2011年第6期18卷 2201-2206页

作者：张肖宁万成王栋贺玲凤 Department of Civil and Transportation Engineering South China University of Technology Department of Civil and Environmental Engineering Virginia Polytechnic Institute and State University

In order to verify the validity of finite element numerical simulation method for asphalt mixture, which consists of aggregates, mastic （where mastic is a kind of fine mixture composed of asphalt binder mixed with fines and fine aggregates） and air voids, based on three-dimensional （3D） heterogeneous specimen, X-ray computerized tomography （X-ray CT） was used to scan the asphalt specimens to obtain the real internal microstrnctures of asphalt mixture. CT images were reconstructed to build up 3D digital specimen, and the viscoelastic properties of mastic were described with Burgers model The uniaxial creep numerical simulations of three different levels of aggregate gradation were conducted. The simulation results agree well with the experimental results. The numerical simulation of asphalt mixture incorporated with real 3D microstructure based on finite element method is a promising application to conduct research of asphalt concrete. Additionally, this method can increase the mechanistic understanding of global viscoelastic properties of asphalt mixtures by linking the real 3D microstructure.

关键词： asphalt mixture X-ray CT 3D heterogeneous specimen numerical simulation

Effects of Aggregate Size and Specimen Scale on asphalt mixture Cracking Using a Micromechanical Simulation Approach

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Journal of Wuhan University of Technology(Materials Science) 2017年第6期32卷 1503-1510页

作者：刘卫东高英 HUANG Xiaoming School of Architecture and Transportation Engineering Guilin University of Electronic Technology Guilin 541004 China School of Transportation Southeast University Nanjing 210096 China

A micromechanical model based on discrete element method（DEM） was employed to investigate the effects of aggregate size and specimen scale on the cracking behavior of asphalt mixture. An algorithm for generating three-dimensional aggregates that can reflect the realistic geometry such as shape, size and fracture surface of aggregate particles was developed using a user-defined procedure coded with FISH language in particle flow code in three-dimensions（PFC3 D）. The parallel-bond model（PBM）, linear contact model（LCM）, and slip model（SM）, whose sets of micro parameters were obtained by comparing experimental tests with numerical simulation results, were used to characterize the internal contact behavior of asphalt mixture. Digital asphalt mixture specimens were used to simulate the effects of aggregate size and specimen scale on the cracking behavior by the indirect tensile（IDT） test. Some conclusions can be drawn as follows： Both cracks and IDT strength decrease with increasing aggregate size. However, the heterogeneity of contact-force distribution augments with increasing aggregate size, especially with 13.2-16 mm aggregate. The aggregate size of 4.75-9.5 mm dominates in forming skeleton structure for asphalt mixture. The IDT strength decreases and cracks augment with increasing sample scale. The crack growth can be well interpreted from the perspective of energy analysis. The conclusions show that the proposed micromechanical model is suitable for the simulation of crack propagation. This study provides an assistant tool to further study the cracking behavior of particle-reinforced composites material such as asphalt mixture and Portland cement concrete.

关键词： discrete element method asphalt mixture cracking IDT micromechanics

Effect of Encapsulation Combined with Microwave Heating on Self-Healing Performance of asphalt mixture

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Journal of Renewable Materials 2021年第10期9卷 1781-1794页

作者： Benan Shu Lixian Guo Bing Qiu Tengyu Yang Tao Sun Wenjun Qiu Min Zhou Putao Song Yuanyuan Li Diego Maria Barbieri Shaopeng Wu Foshan Transportation Science and Technology Co. Ltd.Foshan528000China China Academy of Building Research Beijing100000China School of Civil Engineering and Architecture Wuhan Institute of TechnologyWuhan430070China Department of Civil and Environmental Engineering Norwegian University of Science and TechnologyTrondheim7491Norway State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan430070China

As an innovative maintenance technology of asphalt pavement,encapsulated rejuvenator used to improve its self-healing performance has been widely investigated by researchers in recent *** this work,the selfhealing properties of asphalt mixture with and without encapsulations were comparatively studied considering these parameters:Healing time,healing cycles and microwave ***-point bending strength recovery test and fatigue loading cycles recovery test were conducted for two kinds of encapsulations containing the healing agents present inside the asphalt mixture,namely compartmented Ca-alginate/SiO_(2) fiber and compartmented Ca-alginate/graphene oxide *** results showed that the optimum healing time was three *** the 30 s of microwave heating,the recovery of fatigue loading cycles of asphalt mixture with compartmented Ca-alginate/graphene oxide fiber was four times larger than that of control asphalt *** with the single effect related to the encapsulated healing agent or temperature,the synergistic effect of temperature and encapsulation could further significantly improve the self-healing properties of asphalt *** compartmented Ca-alginate/graphene oxide fiber not only could soften asphalt through the encapsulated healing agent to improve self-healing properties of asphalt,but also could repeatedly and quickly heal cracks thanks to microwave *** synthesis of the fiber breaks the current boundary between the two technologies(capsules healing method and induction healing method)and opens up a new horizon for the asphalt self-healing technology.

关键词： asphalt mixture self-healing compartmented fiber encapsulation microwave heating

Fatigue Property of Basalt Fiber-Modified asphalt mixture under Complicated Environment

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Journal of Wuhan University of Technology(Materials Science) 2014年第5期29卷 996-1004页

作者：郑元勋 CAI Yingchun ZHANG Guanghai FANG Hongyuan College of Water Conservancy and Environment Zhengzhou University The Faculty of Infrastructure Engineering Dalian University of Technology

The fatigue property of asphalt mixtures under complicated environment （low-temperature bending performance, chloride penetration, freezing-thawing cycle and their coupling effect） and the improvement effect for relevant property of basalt fiber-reinforcing asphalt mixture under complicated environment are studied. Two grading types of asphalt mixtures, AC-16I and AC-13I, are chosen, whose optimum asphalt-aggregate ratio and optimum dosage of basalt fiber are determined by the Marshall test. The standard specimens are made firstly, and then the low temperature bending tests of asphalt mixture and basalt fiber-reinforced asphalt mixture under the coupling effect of the chloride erosion and freezing-thawing cycle have been carried out. Finally, the fatigue property tests of asphalt mixture and basalt fiber-reinforced asphalt mixture under complex environment are performed on MTS material testing system. The results indicate that the tensile strength, the maximum curving tensile stress, the curving stiffness modulus, and fatigue properties of asphalt mixture are influenced by the coupling effect of the chloride erosion and freezing-thawing cycle. The low-temperature bending performance and fatigue property of asphalt mixtures under complicated environment can be greatly improved by adding moderate basalt fiber. The dense gradation asphalt mixture possesses stronger ability to resist adverse environmental effects under the same condition.

关键词： asphalt mixture basalt fiber the chloride erosion freezing-thawing cycle the coupling effect low-temperature performance fatigue property