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 作者單位： School of Transportation, Southeast University, Nanjing 210096, China 期 刊： 中南大學(xué)學(xué)報(bào)（英文版）   EISCI Journal： Journal of Central South University of Technology(English Edition) 年，卷(期)： 2011, 18(6) 分類號(hào)： U416.217 Keywords： stone matrix asphalt    aggregate    gradation    skeleton    degradation    機(jī)標(biāo)分類號(hào)： U44 TB3 機(jī)標(biāo)關(guān)鍵詞： 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 基金項(xiàng)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[期刊論文]  中南大學(xué)學(xué)報(bào)（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 ...

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