疲勞裂縫降低鋪面服務年限壽命，本研究進行半圓彎曲試驗(SCB)和工程性質試驗，探討瀝青混凝土裂縫行為，配比設計採用最大標稱粒徑19mm密級配規範，使用相同瀝青用量與級配曲線維持不變，工程性質顯示改質瀝青混凝土的流度值和回彈模數較傳統瀝青高，說明改質瀝青擁有彈性性能，殘餘強度(TSR)和動穩定值則顯示改質瀝青混凝土的抗水侵害與抗車轍能力較傳統瀝青佳。半圓彎曲試驗結果顯示，裂縫面會繞過大粒徑粒料，勁度高的瀝青混凝土裂縫面會穿過小粒徑粒料，改質瀝青混凝土的臨界應變能(U)和臨界應變能釋放速率(Jc)較傳統瀝青高，說明改質瀝青的承載力和抗疲勞開裂能力較傳統瀝青佳。工程性質和參數比較顯示，間接張力與回彈模數呈正相關，底部拉伸應力(TS)和間接張力沒有呈現相關性，最大垂直應變(εm)和Jc呈現部分正相關。

Fatigue cracks will reduce the service years of pavement. In this research, semi-circular bending test and engineering properties were tested, in order to evaluate the cracking behavior of asphalt concrete. Asphalt mixture design meet to the specification of dense gradation asphalt concrete with nominal maximum aggregate size 19mm. The asphalt content and mixture design curve between different binders are the same. Engineering properties show polymer modified asphalt mixture has the higher flow value and resilient modulus than normal asphalt mixture. It shows polymer modified asphalt has better elastic properties. The results of tensile strength ratio and rut depth indicate the moisture susceptibilities and rutting resistance of polymer modified asphalt mixture are better than normal asphalt mixture. The result of semi-circular bending test shows cracking surface will bypass the bigger size of aggregates. The cracking surface of the asphalt mixture with larger stiffness will go through the smaller size of aggregates. The strain energy to failure (U) and the critical strain energy release rate (Jc) of the polymer modified asphalt mixture are higher than the normal asphalt mixture. It means polymer modified asphalt has better endurance and fatigue cracking resistance capacities than normal asphalt. Engineering properties and parameters show, there are linear correlation between indirect tensile strength and resilient modulus. However, maximum tensile strength (TS) and indirect tensile strength do not show any correlation. The maximum vertical strain (εm) and critical strain energy release rate have partial linear correlation.

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