刚柔复合式路面裂缝反射预防材料开发及结构表征

Research and Structural Characterizations of Crack-reflection Preventing Material for Rigid-flexible Composite Structure

针对现有刚柔复合式路面裂缝反射预防材料高温软化、低温断裂的缺点,以沥青材料的高温软化点和低温延度为指标研发了适用于防治裂缝反射的有机复合材料,通过红外光谱试验(FTIR)和差示扫描热(DSC)试验探究了有机添加剂对沥青官能团的影响和裂缝反射预防材料在工作环境下温度变化对热稳定性的影响,并通过板带拉伸试验深入分析了裂缝反射预防材料的抗拉和抗变形能力。结果表明,裂缝反射预防材料具有较好的高温稳定性和低温抗裂性,能够满足在高温施工不软化流淌、低温环境受拉不断裂的要求;两种高分子材料加入到沥青中形成了有利于提高材料延展性和降低温度敏感性的基团;同时,裂缝反射预防材料在辅助以玻纤布后具有了与强力材料相同的弹性变形阶段、强化阶段、屈服阶段和缩颈阶段,其抗拉与抗变形性能可以在刚柔复合式路面中发挥良好的裂缝反射预防功效。

In order to conquer the existing crack-reflection preventing materials′faults such as softened in high temperature,fractured in low temperature,an organic composite material suitable for the prevention and treatment of crack-reflection was researched and developed with the index of softening point and ductility,Fourier Transform infrared spectroscopy（FTIR）and differential scanning calorimetry（DSC）test were used to explore the effect of organic additives on functional groups and thermal stability in the changing environment temperature for the crack-reflection preventing material,then the tensile strength and resistance of deformation ability were evaluated through the strip tension test.The research results showed that crack-reflection preventing material has good stability in high temperature and crack resistance in low temperature,it can satisfy the requirements of no softening in construction temperature and no tensile fracture in low temperature.The functional groups which can improve material ductility and reduce the temperature sensitivity were added when two kinds of polymer material mixed with asphalt.At the same time,when crack-reflection preventing material work with glass fiber cloth they showed the same relationship between stress and tension value as powerful material,which include elastic deformation stage,stage of intensive,yield and necking stage,so its tensile and resistance performance can play well for crack-reflection preventing in rigid-flexible composite structure pavement.