期刊文献+
共找到97篇文章
< 1 2 5 >
每页显示 20 50 100
Multiscale Study on Low Temperature Crack Resistance Mechanism of Steel Slag Asphalt Mixture
1
作者 白雪峰 王岚 CHEN Xiunan 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2024年第3期705-715,共11页
The objective of this paper was to study low temperature crack resistance mechanism of steel slag asphalt mixture(SAM).Thermal stress restrained specimen test(TSRST)and three-point bending test were carried out to eva... The objective of this paper was to study low temperature crack resistance mechanism of steel slag asphalt mixture(SAM).Thermal stress restrained specimen test(TSRST)and three-point bending test were carried out to evaluate the low-temperature crack resistance of SAM and basalt asphalt mixture(BAM).Based on the digital image correlation technique(DIC),the strain field distribution and crack propagation of SAM were analyzed from the microscopic point of view,and a new index,crack length factor(C),was proposed to evaluate the crack resistance of the asphalt mixture.The crystal phase composition and microstructure of steel slag aggregate(SA)and basalt aggregate(BA)were studied by X-ray diffraction(XRD)and scanning electron microscopy(SEM)to explore the low-temperature crack resistance mechanism of SAM.Results show that the low-temperature crack resistance of SAM is better than that of BAM;SAM has good integrity and persistent elastic deformation,and its bending failure mode is a hysteretic quasi-brittle failure;The SA surface is evenly distributed with pores and has surface roughness.SA has the composition phase of alkaline aggregate-calcite(CaCO3),so it has good adhesion to asphalt,which reveals the mechanism of excellent low-temperature crack resistance of SAM. 展开更多
关键词 steel slag asphalt mixture ·low-temperature crack resistance ·strain energy density ·XRD SEM
下载PDF
Predictive modelling of volumetric and Marshall properties of asphalt mixtures modified with waste tire-derived char:A statistical neural network approach
2
作者 Nura Shehu Aliyu Yaro Muslich Hartadi Sutanto +4 位作者 Noor Zainab Habib Aliyu Usman Abiola Adebanjo Surajo Abubakar Wada Ahmad Hussaini Jagaba 《Journal of Road Engineering》 2024年第3期318-333,共16页
The goals of this study are to assess the viability of waste tire-derived char(WTDC)as a sustainable,low-cost fine aggregate surrogate material for asphalt mixtures and to develop the statistically coupled neural netw... The goals of this study are to assess the viability of waste tire-derived char(WTDC)as a sustainable,low-cost fine aggregate surrogate material for asphalt mixtures and to develop the statistically coupled neural network(SCNN)model for predicting volumetric and Marshall properties of asphalt mixtures modified with WTDC.The study is based on experimental data acquired from laboratory volumetric and Marshall properties testing on WTDCmodified asphalt mixtures(WTDC-MAM).The input variables comprised waste tire char content and asphalt binder content.The output variables comprised mixture unit weight,total voids,voids filled with asphalt,Marshall stability,and flow.Statistical coupled neural networks were utilized to predict the volumetric and Marshall properties of asphalt mixtures.For predictive modeling,the SCNN model is employed,incorporating a three-layer neural network and preprocessing techniques to enhance accuracy and reliability.The optimal network architecture,using the collected dataset,was a 2:6:5 structure,and the neural network was trained with 60%of the data,whereas the other 20%was used for cross-validation and testing respectively.The network employed a hyperbolic tangent(tanh)activation function and a feed-forward backpropagation.According to the results,the network model could accurately predict the volumetric and Marshall properties.The predicted accuracy of SCNN was found to be as high value>98%and low prediction errors for both volumetric and Marshall properties.This study demonstrates WTDC's potential as a low-cost,sustainable aggregate replacement.The SCNN-based predictive model proves its efficiency and versatility and promotes sustainable practices. 展开更多
关键词 Waste tire Neural network Sustainable practices Asphalt mixtures Predictive model
下载PDF
Long-term performance of recycled asphalt mixtures containing high RAP and RAS
3
作者 Jiangmiao Yu Zengyao Lin +3 位作者 Guilian Zou Huayang Yu Zhen Leng Yuan Zhang 《Journal of Road Engineering》 2024年第1期36-53,共18页
The application of reclaimed asphalt pavement(RAP)and reclaimed asphalt shingles(RAS)on asphalt pavement can reduce the asphalt paving cost,conserve energy and protect the environment.However,the use of high contents ... The application of reclaimed asphalt pavement(RAP)and reclaimed asphalt shingles(RAS)on asphalt pavement can reduce the asphalt paving cost,conserve energy and protect the environment.However,the use of high contents of RAP and RAS in asphalt pavement may lead to durability issues,especially the fatigue cracking and thermal cracking.It is necessary to conduct a series of analyses on asphalt mixtures containing high RAP and RAS,and seek methods to enhance their long-term performance.This paper provides a comprehensive over-view of the long-term performance of recycled asphalt mixtures containing high contents of RAP and RAS.The findings in this research show that rutting resistance of high recycled asphalt mixtures is not a concern,whereas their resistance to fatigue and thermal cracking is not conclusive.Recycling agents can be used to improve the thermal cracking resistance of high recycled asphalt mixtures.An optimum decision on recycling agents will improve the durability properties of high recycled asphalt mixtures.It is recommended that to use a balanced mixture design approach with testing of the blended asphalt binders will provide better understanding of long-term performance of recycled asphalt mixtures containing high RAP and RAS. 展开更多
关键词 Recycled asphalt mixture Recycling agents Long-term performance CRACKING
下载PDF
Normalized fatigue properties of asphalt mixture at various temperatures 被引量:2
4
作者 Dongdong Ge Zihao Ju +3 位作者 Defeng Duan Songtao Lyu Weiwei Lu Chaochao Liu 《Journal of Road Engineering》 2023年第3期279-287,共9页
This study normalized the mixture's fatigue behavior at various temperatures,and the strength and fatigue tests of the mixture were conducted.The stress state of the asphalt mixture includes direct tensile,uniaxia... This study normalized the mixture's fatigue behavior at various temperatures,and the strength and fatigue tests of the mixture were conducted.The stress state of the asphalt mixture includes direct tensile,uniaxial compression,and indirect tensile.The Desai yield surface and fatigue path were proposed.And a normalized fatigue characteristics model of the mixture was established.The following conclusions were obtained.With the increases in the loading rate,the strength of the asphalt mixture increased.As the temperature increases,the strength of the mixture is reduced.At various temperatures and rates,the strength forms a closed curved surface.The Desai strength yield surface was established,which forms a closed curved surface.When the loading rate and temperature are below a certain critical line,the asphalt mixture will not undergo strength damage.At a fixed stress state,the fatigue damage path of the mixture was determined.The stress ratio was determined considering the influence of the loading rate.In this way,a normalized model can be described to express the asphalt mixture fatigue properties at various temperatures and stress levels.For the asphalt mixture in an indirect tensile state,the normalized fatigue equation parameter is 4.09.This model is more suitable for reflecting the viscous-elastic behavior of the mixtures than the fatigue equation determined by the notional stress ratio. 展开更多
关键词 Asphalt mixture Normalization equation Load rates Test temperature Stress level Desai yield surface
下载PDF
A review on evaluation of crack resistance of asphalt mixture by semi-circular bending test 被引量:1
5
作者 Yongjun Meng Weikang Kong +4 位作者 Chaoliang Gou Shenwen Deng Yirong Hu Jing Chen Liupeng Fan 《Journal of Road Engineering》 2023年第1期87-97,共11页
Although there are many kinds of fracture tests to choose from in evaluating the crack resistance of asphalt mixture,the semi-circular bending(SCB)test has attracted a lot of attention in the academic road engineering... Although there are many kinds of fracture tests to choose from in evaluating the crack resistance of asphalt mixture,the semi-circular bending(SCB)test has attracted a lot of attention in the academic road engineering community because of its simplicity,stability,and flexibility in testing and evaluation.The SCB test has become a common method to study the cracking resistance of asphalt mixture in recent years.This paper mainly summarizes the overview of the SCB test,summarizes some research results and common characterization parameters of the SCB test method in monotone test and fatigue test in recent years,and predicts and suggests the research direction of the SCB test in the future.It is found that the research on the monotonic SCB test is more comprehensive,and the research on the SCB fatigue test needs to be further improved in the aspects of loading mode,characterization parameter selection,and so on.Researchers can flexibly adjust the geometric dimensions and the test parameters of semi-cylindrical specimens,and conduct comprehensive analysis combined with the results of numerical simulation.The crack resistance of asphalt mixture can be comprehensively evaluated by fracture energy,fracture toughness,stiffness,flexibility index and other fracture indicators,combined with the crack propagation of the specimen.The analysis of numerical simulation can confirm the test results.In order to standardize the setting of fatigue parameters for future application,it is necessary to standardize the setting of bending performance. 展开更多
关键词 Asphalt mixture Crack resistance Fatigue performance Semi-circular bending test
下载PDF
Bamboo Fiber Modified Asphalt Mixture Proportion Design and Road Performances Based on Response Surface Method
6
作者 李海滨 SUN Jianmei +3 位作者 WANG Sirui ZHANG Mingming HU Yihong SHENG Yanping 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第1期156-170,共15页
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 mixtur... 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 mixtures.First 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 forward.Then,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 ratio.Finally,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 tested.The 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 mixture.When the length of bamboo fiber is 7.25 mm and the content of 0.22%,the road performance of the asphalt mixture was optimal.Consequentially,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. 展开更多
关键词 bamboo fiber response surface method asphalt mixture proportion design road performances bamboo waste
下载PDF
Influence of Hydrodynamic Pore Pressure Damage on the Performance of Hot-Mixed Renewable Asphalt Mixture
7
作者 Guodong Zeng Chao Li +3 位作者 Yang Fang Hongming Huang Hao Li Yishen Xu 《Journal of Renewable Materials》 SCIE EI 2023年第5期2453-2467,共15页
For evaluating the water stability of hot-mixed renewable asphalt mixture(HRM),the traditional methods are all tested under still water conditions.Except for damage in still water conditions,the hydrodynamic pore pres... For evaluating the water stability of hot-mixed renewable asphalt mixture(HRM),the traditional methods are all tested under still water conditions.Except for damage in still water conditions,the hydrodynamic pore pressure generated by the tire driving on the surface water has a great impact.Thus,the RAP contents of the HRMs were designed at 0%,30%,45%and 60%with AC-25 gradation.Then,the self-designed evaluation methods of water stability and dynamic modulus were studied.Finally,the mechanism of the influence of hydrodynamic pore pressure damage on HRMs was studied.The results show that the water stability of HRM containing 30%RAP is equivalent to that of 45%RAP,and the water stability of HRM containing 60%RAP decreases significantly.The Contabro test after MIST treatment can be used as an evaluation method for hydrodynamic pore pressure damage on HRM.Low-speed,heavy-load traffic and larger RAP content have greater damage to the mixture after hydrodynamic pore pressure damage.The performance differences between the aged bitumen and pure bitumen,as well as the aged minerals and new minerals,are continuing to be enlarged in hydrodynamic pore pressure conditions,finally affecting the water stability and dynamic modulus of the HRMs. 展开更多
关键词 Hot-mixed renewable asphalt mixture water stability dynamic modulus hydrodynamic pore pressure
下载PDF
Analytical Study on the Effect of Electric Arc Furnace Dust(EAFD)on the Rutting of Asphalt Concrete Mixtures
8
作者 Mohammad A.T.Alsheyab Taisir S.Khedaywi 《Journal of Smart Buildings and Construction Technology》 2023年第1期24-28,共5页
As a byproduct of the steelmaking process,significant amounts of hazardous electric arc furnace dust(EAFD)are produced.Utilizing the solidification/stabilization technology with asphalt mix is one way to safeguard the... As a byproduct of the steelmaking process,significant amounts of hazardous electric arc furnace dust(EAFD)are produced.Utilizing the solidification/stabilization technology with asphalt mix is one way to safeguard the environment from its negative effects.Rutting was used as an indicator to assess the asphalt mixture with EAFD since it is an important factor in pavement design.This study’s major goal is to ascertain how EAFD affects the rutting of asphalt-concrete mixtures.To evaluate the ideal asphalt content,the Marshall test method was applied to asphalt-concrete mixtures.EAFD was added to the asphalt cement in four different volume percentages as a binder addition.Then,using the Universal Testing Machine,participants were exposed to a replica of the rutting test(UTM).Experiments were conducted at 25℃,40℃ and 55℃,and at frequencies of 1 Hz,4 Hz and 8 Hz.Rutting was measured for each specimen.Test results showed that rut depth has a negative correlation with EAFD%and a positive correlation with temperature.The use of EAFD has dual advantages,protecting the environment from the adverse impact of EAFD and reducing the cost of asphalt mix without jeopardizing pavement performance. 展开更多
关键词 EAFD RUTTING Asphalt mixtures TEMPERATURE Loading frequencies
下载PDF
Experimental study of pavement performance of basalt fiber-modified asphalt mixture 被引量:17
9
作者 范文孝 康海贵 郑元勋 《Journal of Southeast University(English Edition)》 EI CAS 2010年第4期614-617,共4页
To discuss the pavement performance of basalt fiber-modified asphalt mixtures,the optimum dosages of asphalt and fibers are studied by the Marshall test and the rutting test.The results demonstrate that the optimum do... To discuss the pavement performance of basalt fiber-modified asphalt mixtures,the optimum dosages of asphalt and fibers are studied by the Marshall test and the rutting test.The results demonstrate that the optimum dosages of asphalt and fibers are 4.63% and 0.3%,respectively.Then the pavement performances of basalt(polyester,xylogen)fiber-modified asphalt mixtures are investigated through high temperature stability tests,water stability tests and low temperature crack resistance tests.It indicates that the pavement performances of the fiber-modified asphalt mixtures such as rutting dynamic stability,freezing splitting tensile strength,low temperature crack resistance and so on are improved compared with control asphalt mixture.The results show that the pavement performances of asphalt mixtures can be improved by fiber-modifiers.Besides,the improvement effects of basalt fiber are superior to polyester fiber and xylogen fiber. 展开更多
关键词 asphalt mixture basalt fiber Marshall test high temperature stability test pavement performance
下载PDF
Laboratory evaluation of epoxy resin modified asphalt mixtures 被引量:13
10
作者 钱振东 罗桑 王建伟 《Journal of Southeast University(English Edition)》 EI CAS 2007年第1期117-121,共5页
The pavement performance of epoxy resin modified asphalt mixtures was investigated by the Marshall test, the indirect tensile test, the rutting test, the three-pointed bending test and the composite beam fatigue test.... The pavement performance of epoxy resin modified asphalt mixtures was investigated by the Marshall test, the indirect tensile test, the rutting test, the three-pointed bending test and the composite beam fatigue test. In comparison with the performance of epoxy resin modified asphalt mixtures, the performance of stone matrix asphalt mixtures (SMA10) was also investigated. The rutting test and composite beam fatigue test results show that the epoxy resin modified asphalt mixtures can improve permanent deformation and fatigue characteristics. They also show lower temperature susceptibility and greater resistance to moisture damage compared to the SMA10. Findings from the research indicate that the epoxy resin modified asphalt mixture provides an optional material for the pavement of long-span steel bridges in China due to profound performance and economic advantages. 展开更多
关键词 epoxy resin modified asphalt epoxy resin modified asphalt mixture PAVEMENT strength performance
下载PDF
Virtual rutting test of asphalt mixture using discrete element method 被引量:6
11
作者 张德育 黄晓明 高英 《Journal of Southeast University(English Edition)》 EI CAS 2012年第2期215-220,共6页
In order to investigate the permanent deformation behavior of asphalt mixtures from discontinuity, the virtual rutting test of asphalt mixtures is developed by the discrete element method (DEM). A digital specimen g... In order to investigate the permanent deformation behavior of asphalt mixtures from discontinuity, the virtual rutting test of asphalt mixtures is developed by the discrete element method (DEM). A digital specimen generation procedure considering aggregate gradation and irregular shape is developed based on the probability theory and the Monte Carlo method. The virtual rutting test is then conducted based on the generated digital specimen. In addition, on the basis of the time-temperature superposition (TTS) principle, a calculation method is used to reduce the computation time of the virtual rutting test. The simulation results are compared with the laboratory measurements. The results show that the calculation method based on the TFS principle in the discrete element (DE) viscoelastic model can significantly reduce the computation time. The deformation law of asphalt mixtures in the virtual rutting test is similar to the laboratory measurements, and the deformation and the dynamic stability of the virtual rutting test are slightly greater than the laboratory measurements. The two-dimensional virtual rutting test can predict the permanent deformation performance of asphalt mixtures. 展开更多
关键词 asphalt mixture permanent deformation discrete element method virtual rutting test
下载PDF
Relationship between repeated triaxial test and Hamburg wheel tracking test on asphalt mixtures 被引量:4
12
作者 朱浩然 杨军 +1 位作者 史啸 陆海珠 《Journal of Southeast University(English Edition)》 EI CAS 2010年第1期117-121,共5页
Both the repeated triaxial test (RTT) and the Hamburg wheel tracking test (HWTT) are adopted to evaluate the high temperature performance of the stone mastic asphalt (SMA) and the mastic asphalt (MA). The corr... Both the repeated triaxial test (RTT) and the Hamburg wheel tracking test (HWTT) are adopted to evaluate the high temperature performance of the stone mastic asphalt (SMA) and the mastic asphalt (MA). The correlation of the permanent deformations of the MA and the correlation of the deformation developments of the SMA between the two tests are analyzed, respectively. Results show that both the two tests can effectively identify the high temperature performance of mixtures, and the correlation between the final results of the two tests as well as that between the deformation developments of the two tests are excellent with R20.9. In order to further prove the correlation, viscoelastic parameters estimated from the RTT results is used to simulate the rutting development in the HWTT slabs by the finite element method (FEM). Results indicate that the correlation between the two tests is significant with errors less than 10%. It is suitable to predict the rutting development with the viscoelastic parameters obtained from the RTT. 展开更多
关键词 asphalt mixture repeated triaxial test Hamburg wheel tracking test CORRELATION high temperature performance finite element method
下载PDF
Indirect tension test of epoxy asphalt mixtureusing microstructural finite-element model 被引量:8
13
作者 王江洋 钱振东 《Journal of Southeast University(English Edition)》 EI CAS 2011年第1期65-69,共5页
A finite-element model of the thermosetting epoxy asphalt mixture(EAM) microstructure is developed to simulate the indirect tension test(IDT).Image techniques are used to capture the EAM microstructure which is di... A finite-element model of the thermosetting epoxy asphalt mixture(EAM) microstructure is developed to simulate the indirect tension test(IDT).Image techniques are used to capture the EAM microstructure which is divided into two phases:aggregates and mastic.A viscoelastic constitutive relationship,which is obtained from the results of a creep test,is used to represent the mastic phase at intermittent temperatures.Model simulation results of the stiffness modulus in IDT compare favorably with experimental data.Different loading directions and velocities are employed in order to account for their influence on the modulus and the localized stress of the microstructure model.It is pointed out that the modulus is not consistent when the loading direction changes since the heterogeneous distribution of the mixture internal structure,and the loading velocity affects the localized stress as a result of the viscoelasticity of the mastic.The study results can provide a theoretical basis for the finite-element method,which can be extended to the numerical simulations of asphalt mixture micromechanical behavior. 展开更多
关键词 MICROSTRUCTURE epoxy asphalt mixture image techniques finite-element model indirect tension test
下载PDF
Evaluation of modification effect of epoxy resin based on performance of asphalt mixtures 被引量:4
14
作者 杨军 陆海珠 +1 位作者 袁登全 王建伟 《Journal of Southeast University(English Edition)》 EI CAS 2007年第1期122-126,共5页
Based on the analysis of the main failures discovered in pavement on steel deck plate and the demanding service condition of the pavement on steel deck, high-temperature rutting test, low-temperature bending test and ... Based on the analysis of the main failures discovered in pavement on steel deck plate and the demanding service condition of the pavement on steel deck, high-temperature rutting test, low-temperature bending test and controlled stress flexural fatigue test are used to study the performance of asphalt mixtures modified by epoxy resin including high-temperature stability, low-temperature cracking-resistance, and fatigue cracking-resistance, which are served to evaluate the modification effect of epoxy resin of different contents. With the addition of epoxy resin, all the three performances are improved greatly. However, when the amount of epoxy resin added is over a certain value, the modification effect will be stable with no extra benefit detected. Finally, in terms of the properties of the three respects, 20%, 30%, 30% are given separately as the proposal adding contents. 展开更多
关键词 pavement on steel deck plate content of epoxy resin asphalt mixtures modified by epoxy resin PERFORMANCE modification effect
下载PDF
Study on viscoelastic performance of asphalt mixture based on CAM model 被引量:11
15
作者 张肖宁 迟凤霞 +1 位作者 王丽健 史金锋 《Journal of Southeast University(English Edition)》 EI CAS 2008年第4期498-502,共5页
In order to study the viscoelastic characteristics of asphalt mixtures in the whole-frequency range, a dynamic shearing rheometer is used to carry out dynamic frequency sweeps for asphalt mixtures, which obtains the t... In order to study the viscoelastic characteristics of asphalt mixtures in the whole-frequency range, a dynamic shearing rheometer is used to carry out dynamic frequency sweeps for asphalt mixtures, which obtains the three-dimensional relationships among G^*, temperature and frequency. Then the time-temperature shift principle is used to translate the relationships from three dimensions to two dimensions, so master curves are obtained regarding dynamic modules changing along with the frequency over 15 amount levels. The Christensen- Anderson-Marasteanu (CAM) model, a kind of the rheological model, is used to analyze and compare rheological performances of several asphalt mixtures based on the obtained master curves. The results indicate that the dynamic theological test is an effective method for obtaining the master curve. Besides, the CAM model can describe well the viscoelastic deformation characteristics of asphalt mixtures. 展开更多
关键词 asphalt mixture CAM model master curve
下载PDF
Virtual fracture test of asphalt mixture based on discrete element method 被引量:6
16
作者 陈俊 黄晓明 《Journal of Southeast University(English Edition)》 EI CAS 2009年第4期518-522,共5页
In order to study fracture behaviors of asphalt mixtures, virtual tests of the two-dimensional(2D) microstructure based on the discrete element method( DEM) are designed. The virtual structure of the 2D digital sp... In order to study fracture behaviors of asphalt mixtures, virtual tests of the two-dimensional(2D) microstructure based on the discrete element method( DEM) are designed. The virtual structure of the 2D digital specimen of asphalt mixture is generated based on a particle generation program, in which the gradation and the irregular shapes of aggregates are considered. With the 2D digital specimens, a DEM-based mixture model is established and center-point beam fracture simulation tests are conducted by the DEM. Meanwhile, a series of calibration tests are carried out in laboratory to evaluate the DEM model and validate the methods of virtual fracture tests. The test results indicate that the fracture intensity of asphalt mixtures predicted by the DEM matches very well with the intensity obtained in laboratory. It is concluded that the microstructural virtual tests can be used as a supplemental tool to evaluate fracture properties of asphalt mixtures. 展开更多
关键词 asphalt mixture FRACTURE discrete element method virtual test
下载PDF
Evaluation of fracture properties of epoxy asphalt mixtures by SCB test 被引量:3
17
作者 陈先华 李炜农 李洪涛 《Journal of Southeast University(English Edition)》 EI CAS 2009年第4期527-530,共4页
The fracture properties of epoxy asphalt mixtures (EAM) are evaluated based on J-integral and ultimate strength. Totally 60 semi-circular bending (SCB)specimens cored from superpave gyratory compactor (SGC)with ... The fracture properties of epoxy asphalt mixtures (EAM) are evaluated based on J-integral and ultimate strength. Totally 60 semi-circular bending (SCB)specimens cored from superpave gyratory compactor (SGC)with three groups of notch depths are tested at the temperature of - 10 and 20 ℃. The experimental results reveal good repeatability in EAM characterization. The tensile strength ratio of SCB to the indirect tensile test (IDT) is at a range of 1.4 to 1.7, and the ultimate strength of EAM is exponentially dependent on the notch depths. At the test temperatures, the critical J-integral value of EAM is much higher than that of hot mix asphalt( HMA) with thermoplastic asphalt binder. The response mode of EAM changes from ductile mode to brittle mode and the fracture energy increases 30% when temperature decreases from 20 to - 10℃, while its critical J-integral value decreases only 15%. It is concluded that EAM has better fracture resistance than thermo-plastic HMA; more fracture energy is needed to initiate cracks in EAM at low temperature, and the cracks propagate more rapidly than at room temperature. 展开更多
关键词 epoxy asphalt mixture tensile strength critical J- integral semi-circular bending test
下载PDF
Development of overlay tester for fracture test of asphalt mixture 被引量:2
18
作者 李兴海 黄卫 钱振东 《Journal of Southeast University(English Edition)》 EI CAS 2013年第3期294-299,共6页
To determine the fracture characteristics of asphalt mixture a novel fracture test with modified loading modes loading fixtures and the control system of the conventional overlay tester is implemented by the asphalt m... To determine the fracture characteristics of asphalt mixture a novel fracture test with modified loading modes loading fixtures and the control system of the conventional overlay tester is implemented by the asphalt material performance tester AMPT .In order to evaluate the validity of the proposed fracture test four different loading rates including 1 2 3 and 4 mm/min are examined in the AMPT. The results indicate that the fracture behavior is similar to creep at a low loading rate and does not show significant marginal tail extension at a high loading rate.It clearly shows the phase of crack initiation crack propagation and fracture at a loading rate of 3 mm/min. Besides eight fracture parameters such as fracture energy tensile strength and tensile modulus are applied to evaluate the fracture characteristics of asphalt mixture.Development of the overlay tester for the fracture test of asphalt mixture can be considered as a new fracture test of asphalt mixture. 展开更多
关键词 asphalt mixture fracture test overlay tester asphalt material performance tester (AMPT) fracture parame-ter
下载PDF
Effects of polyphosphoric acid modified asphalt on the low-temperature cracking of asphalt mixtures 被引量:3
19
作者 丁海波 张华 王郴平 《Journal of Southeast University(English Edition)》 EI CAS 2016年第2期215-218,共4页
In order to determine whether polyphosphoric acid (PPA) can partially or completely substitute styrene-butadiene- styrene (SBS) modifier while it does not adversely affect the resistance to thermal cracking of the... In order to determine whether polyphosphoric acid (PPA) can partially or completely substitute styrene-butadiene- styrene (SBS) modifier while it does not adversely affect the resistance to thermal cracking of the asphalt mixture, the low- temperature fracture properties of the PPA modified mixtures are evaluated and compared to the SBS modified mixtures. First, laboratory compacted test samples were tested by the indirect tensile test (IDT) and the newly developed fracture testing protocol, named as disk-shaped compact tension (DCT). Then, the effects of the test temperature and air-void ratio on the low-temperature fracture properties of asphalt mixtures were analyzed. The results show that the fracture resistance of the PPA modified mixtures is worse than that of the SBS modified mixtures. However, for those modified mixtures that use the PPA substituting part of the SBS modifier, a relatively low-temperature fracture resistance can be obtained compared with the mixture only using the SBS modifier. 展开更多
关键词 asphalt mixture low temperature polyphosphoricacid disk-shaped compact tension
下载PDF
Experimental study on dynamic modulus of thermosetting epoxy asphalt mixture for steel deck pavement 被引量:1
20
作者 陈磊磊 钱振东 罗桑 《Journal of Southeast University(English Edition)》 EI CAS 2010年第1期112-116,共5页
In order to study the dynamic performance of the thermosetting epoxy asphalt mixture(EAM), an experimental program on the dynamic modulus E is conducted. First, E of the EAM under different temperatures and frequenc... In order to study the dynamic performance of the thermosetting epoxy asphalt mixture(EAM), an experimental program on the dynamic modulus E is conducted. First, E of the EAM under different temperatures and frequencies are tested through the simple performance test(SPT), and the effects of temperatures and frequencies on the dynamic modulus of the EAM are analyzed. Secondly, the static modulus of the EAM and the dynamic modulus of other two ordinary mixtures are tested and compared to E of the EAM. Finally the dynamic modulus master curve is constructed using the time-temperature superposition principle. The results show that the E values increase with the increase in the test frequency while on the other hand, the E values decrease with the increase in the test temperature. It also can be seen from the results that the dynamic modulus corresponding to the actual vehicle mode is significantly greater than the static modulus, and the dynamic modulus of the EAM is greater than that of SBS mixtures and the common hot mixed asphalt (HMA). The study results can provide a theoretical basis for the design and mechanical analysis of the steel deck pavement. 展开更多
关键词 dynamic modulus epoxy asphalt mixture(EAM) master curve time-temperature superposition principle
下载PDF
上一页 1 2 5 下一页 到第
使用帮助 返回顶部