【作者】 况栋梁；

【导师】 余剑英；

【作者基本信息】 武汉理工大学 ， 材料学， 2007， 硕士

【摘要】 裂缝是沥青路面的主要病害之一，裂缝的存在将使路表雨水通过裂缝渗入土基，大大削弱路基的强度和稳定性，使沥青路面受到更严重的破坏。目前通常采用聚合物改性沥青灌缝膏和聚合物改性乳化沥青作为裂缝修补材料对裂缝进行修补。但是现有的大部分裂缝修补材料与旧油面之间的粘结强度较低、耐久性较差，在路面低温收缩时容易出现裂缝修补材料与旧路面剥离脱落，重新产生裂缝。本文采用马来酸酐(MAH)对SBS改性沥青进行化学改性，制备了SBS／MAH改性沥青灌缝膏和SBS／MAH改性乳化沥青，研究了MAH对裂缝修补材料性能的影响，通过荧光显微镜观察了SBS／MAH改性沥青的微观结构。SBS／MAH改性沥青物理性能测试结果表明，MAH提高了SBS改性沥青的软化点、低温延度、弹性恢复率，同时还改善了SBS改性沥青温度敏感性和热储存稳定性。SBS／MAH改性沥青灌缝膏力学性能测试表明MAH能够显著提高SBS改性沥青灌缝膏与旧油面之间的粘结强度，当马来酸酐的掺量达到0.4％时，SBS／MAH改性沥青灌缝膏的粘结强度达到1.35MPa，与SBS改性沥青相比，增长幅度达到87.5％。与此同时，SBS改性沥青灌缝膏的拉伸强度、断裂伸长率和低温柔韧性均得到不同程度的提高。SBS／MAH改性乳化沥青常规性能测试表明，MAH提高了乳液蒸发残留物的软化点、乳化沥青涂膜的拉伸强度、断裂伸长率和低温柔韧性，显著改善了SBS改性乳化沥青与旧油面之间的粘结强度。长期热氧老化实验结果表明，MAH能够减缓灌缝膏在热氧条件下的老化，当马来酸酐的含量达到0.3％以后，这种减缓作用尤其明显。这主要是因为MAH对SBS改性沥青化学改性之后，MAH与SBS中的双键发生化学反应，使SBS中的C=C双键数量减少，避免了SBS在热氧作用下的断链降解，因此化学改性后的SBS改性沥青灌缝膏的耐热氧老化性得到提高。更多还原

【Abstract】 Crack is a key disease of asphalt pavement. Water on the surface of asphalt pavement may infiltrate into primary roads through the cracks, which greatly weakens the strength and stability of the primary roads, will cause the asphalt pavement suffer more severe damage. At present, polymer modified asphalt and polymer modified asphalt emulsion are widely used as the crack filling material (CFM). Whereas, most of the crack filling materials, which are in low flexibility a poor, take on low adhesive strength with the cracks. The materials aren’t fit to shrinkage in low temperature, which makes a contribution to destroy of CFM, and cracks are formed again.In this thesis, SBS modified asphalt was modified by maleic anhydride (MAH) of different amount. SBS/MAH modified asphalt and SBS/MAH modified asphalt emulsion were prepared. Effect of the MAH on properties of SBS/MAH modified asphalt crack and SBS/MAH modified asphalt emulsion were investigated. The microstructure of SBS/MAH modified asphalt was characterized by fluorescent microscope.Physical properties testing of SBS/MAH modified asphalt indicated that the softening point, ductility at 5°C, recovery rate of elastic at 25°C and penetration index were enhanced by addition of MAH. The high-temperature storage stability was also improved by addition of MAH. Mechanical properties testing of SBS/MAH modified asphalt showed that the adhesive strength was greatly enhanced by addition of MAH, when the content of MAH was 0.4%, the adhesive strength was 1.35MPa, the increment rate can be up to 87.5%. At the same time, the tensile strength, elongation at break and flexibility at low temperature were improved by MAH.Study of SBS/MAH modified asphalt emulsion revealed the softening point, tensile strength, elongation at break and low temperature were improved by MAH. The adhesive strength significantly enhance by addition of MAH.Thermal-oxidative aging experiment showed aging of SBS/MAH modified asphalt crack filling material would occur on the condition of thermal and oxygen, in the person of increment of softening point, decrement of ductility, and decrement of adhesive. Thermal-oxidative aging experiment showed that the thermal-oxidative aging was restrained by addition of maleic anhydride, especially for the content of maleic anhydride was more than 0.3%. It can be attributed to that number of C=C was reduced by chemical modification. Degradation of SBS on the condition of thermal-oxidative aging was restrained. Thus, SBS/MAH modified asphalt crack filling material is steadier than SBS modified asphalt crack filling material. Influence of thermal-oxidative on SBS/MAH modified asphalt crack filling material is less than that of SBS modified asphalt crack filling material.更多还原