胶粉改性沥青稳定碎石的低温力学性能研究

基于沥青稳定碎石层位的受力形式，采用弯曲破坏力学模式对其进行加载破坏试验，分析胶粉改性沥青稳定碎石的极限弯曲破坏应变和极限弯曲破坏强度随温度的变化规律，从胶粉颗粒与沥青界面协同受力角度分析其作用机理。结果表明:与普通沥青稳定碎石相比，温度在-5℃~-20℃区间，胶粉颗粒材料的应用可以显著提高沥青稳定碎石材料的极限弯曲破坏应变，其极限弯曲破坏强度在不同的温度节点有不同程度的提高；温度低于-20℃，胶粉颗粒与沥青界面协同作用效果增强，胶粉改性沥青稳定碎石的极限弯曲破坏强度和极限弯曲破坏应变的温变曲线均出现二次峰值点，二次峰值点的出现导致胶粉改性沥青稳定碎石抗裂性能出现了显著的提升。

Study on Low Temperature Mechanical Properties of Rubber Powder Modified Asphalt Stabilized Macadam

The variation law of ultimate bending failure strain and ultimate bending failure strength of rubber powder modified asphalt stabilized macadam with temperature and the mechanism of the interaction between crumb rubber particles and asphalt interface are analyzed based on the stress form of the asphalt stabilized macadam layer by using the bending failure mechanics model to conduct the loading failure test. The experimental results show that compared with the common asphalt stabilized macadam, the application of rubber particle material can significantly improve the ultimate bending failure strain of the asphalt stabilized macadam materials at the temperature range of -5℃~-20℃, while the ultimate bending failure strength in different temperature nodes have different degrees of improvement. When the temperature is lower than -20℃, the synergistic effect of rubber powder particles and asphalt interface is enhanced, the temperature limit curves of ultimate bending failure strength and ultimate bending failure strain of rubber powder modified asphalt stabilized macadam show two peak points, which results in a remarkable improvement in the cracking resistance of rubber powder modified asphalt stabilized macadam. In the design of asphalt stabilized macadam materials in cold region, the modification technology of rubber powder should be widely concerned and adopted.