苯乙烯-丁二烯-苯乙烯嵌段共聚物改性沥青再生混凝土的制备与抗裂性能分析OA

In order to achieve efficient recycling and improved crack resistance of reclaimed asphalt mixtures,this study systematically investigated the preparation process of styrene-butadiene-styrene(SBS)block copolymer modified asphalt recycled concrete and its low-temperature and fatigue crack resistance.By adjusting the SBS modifier content(1.5%~9.0%)and the recycled material mass fraction(0%~80%),low-temperature bending and four-point bending fatigue tests were conducted using a universal testing machine to measure flexural strength,tensile strain,stiffness modulus,and fatigue life.The results indicate that when the SBS content is 6.0%,the flexural strength reaches its peak,the initial stiffness modulus is 3780 MPa,the modulus decay slope is the lowest,and the low-temperature and fatigue crack resistance are optimal.When the recycled material content exceeds 40%,the fatigue life decreases by approximately 47.8%under the condition of 400 µε and by approximately 73.3%under 600 µε,and the crack resistance significantly deteriorates.Based on comprehensive analysis,a mix proportion with 6.0%SBS content and≤40%recycled material content is recommended,which can achieve resource recycling and green construction goals while ensuring road performance.