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Degradation behavior of aggregate skeleton in stone matrix asphalt mixture
Abstract：The degradation behavior of aggregate skeleton in stone matrix asphalt mixture was investigated based on theoretical analysis,laboratory test and field materials evaluation.A stress-transfer model was established to provide the fundamental understanding of the stress distribution and degradation mechanism of stone matrix asphalt (SMA) aggregate skeleton.Based on the theoretical analysis,crushing test and superpave gyratory compactor (SGC) test were used to evaluate the degradation behavior of aggregate skeleton of SMA.To verify the laboratory test results,gradation analysis was also conducted for the field materials extracted from SMA pavements after long-time service.The results indicate that the degradation of SMA aggregate skeleton is not random but has fixed internal trend and mechanism.Special rule is found for the graded fine aggregates generated from coarse aggregate breakdown and the variation of 4.75 mm aggregate is found to play a key role in the graded aggregates to form well-balanced skeleton to bear external loading.The variation of 4.75 mm aggregate together with the breakdown ratio of aggregate gradation can be used to characterize the degradation behavior of aggregate skeleton.The crushing test and SGC test are proved to be promising in estimating the degradation behavior of SMA skeleton. 作者： Author： MA Tao WANG Zhen ZHAO Yong-li 作者单位： School of Transportation, Southeast University, Nanjing 210096, China 期 刊： 中南大学学报（英文版） EISCI Journal： Journal of Central South University of Technology(English Edition) 年，卷(期)： 2011, 18(6) 分类号： U416.217 Keywords： stone matrix asphalt aggregate gradation skeleton degradation 机标分类号： U44 TB3 机标关键词： asphalt mixture matrix skeleton coarse aggregate degradation behavior test results analysis degradation mechanism stress distribution materials breakdown SMA fine aggregates understanding found based superpave model form key 基金项目： supported by the National Natural Science Foundation of China，supported by the National High Technology Research and Development Program of China Degradation behavior of aggregate skeleton in stone matrix asphalt mixture[期刊论文] 中南大学学报（英文版） --2011, 18(6)The degradation behavior of aggregate skeleton in stone matrix asphalt mixture was investigated based on theoretical analysis,laboratory test and field materials evaluation.A stress-transfer model was ...【Degradation behavior of aggregate sk】相关文章：
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