Degradation behavior of aggregate skeleton in stone matrix asphalt mixture |
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Authors: | Tao Ma Zhen Wang and Yong-li Zhao |
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Affiliation: | (1) Department of Civil Engineering, National Institute of Technology Karnataka, Mangalore, 575025, India;(2) Present address: Department of Civil Engineering, Dayananda Sagar College of Engineering, S.M.Hills, K.S.Layout, Bangalore, 560 078, India |
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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. |
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Keywords: | stone matrix asphalt aggregate gradation skeleton degradation |
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