Coupled Numerical Analysis of Anti?crack Mechanism of Large Stone Asphalt Mixture |
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作者姓名: | 路庆昌 资建民 王海军 黄求喜万伟 |
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作者单位: | 1School of Civil Engineering & Mechanics,Huazhong University of Science & Technology,WuhanHubei430074,China; 2Ningbo Branch of Changchun Municipal Engineering Design & Research Institute,NingboZhejiang315040,China; 3Wuhan CBD Investment & Development Co,Ltd,Wuhan Hubei430022,China; 4Shenzhen Expressway Engineering Consultants Co,Ltd,Shenzhen Guangdong518034,China |
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摘 要: | Stresses of pavement with flexible base of LSAM-30,ATPB-30 and AC-30I at the most adverse point under the function of traffic load and temperature load as well as the coupling of them were calculated and compared by finite element method. The result indicates that flexible bases of LSAM?30 and ATPB?30 are more effective in the prevention of reflection crack Because of the great volume of coarse aggregate and large maximum nominal particle?size,the LSAM-30 thermal conductivity is greater,and the temperature shrinking coefficient is lower as well as the modulus of resilience,which could reduce the emperature gradient among the structure layers effectively and then minish the thermal stress At the same time,the adequate flexibility performance of the LSAM may also absorb strain energy at the crack of the semi?rigid subbase sufficiently As a result,itpresented preferable reflection crack resistance A case study was conducted to do comparative analysis of anti?cracking performance of LSAM-30,ATPB-30 and AC-30I flexible bases A long?term follow?up observation of test roads with the three bases shows that the pavement with LSMA base is in good condition and no sign of crack found while pavements with ATPB?30 and AC?30I flexible bases have varying degrees of crack LSMA flexible base has an obvious performance of anti-crack
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关 键 词: | road engineering anti-crack mechanism numerical analysis large stone asphalt mixture (LSAM) reflection crack |
收稿时间: | 2008-03-13 |
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