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通过扫描电镜、红外光谱、差示扫描量热分析,探寻硅藻精土与沥青的微观结合机制。以0、9%、11%、13%、15%掺配量的硅藻精土改性沥青进行马歇尔试验,分析得出13%掺量的硅藻精土改性沥青效果最佳。以13%掺量的硅藻精土改性沥青进行相关路用性能的室内试验,试验结果表明:硅藻精土改性沥青混合料的劈裂强度较70号沥青混合料的劈裂强度提高了近16.8%;硅藻精土改性沥青混合料的动稳定度是70号沥青混合料的动稳定度的2.07倍。综合得出,13%掺量的硅藻精土改性沥青混合料的路面性能可得到显著的提高。
Scanning electron microscopy, infrared spectroscopy and differential scanning calorimetry were used to explore the microscopic binding mechanism between diatomite and asphalt. The Marshall experiment of diatomite-modified asphalt with 0, 9, 11, 13 and 15% blending rate showed that 13% diatomite-modified asphalt had the best effect. The indoor test of relative road performance with 13% diatomite modified asphalt showed that the splitting strength of diatomite modified asphalt mixture was higher than that of that of 70 asphalt mixture 16.8%. The dynamic stability of diatomite modified asphalt mixture is 2.07 times of the dynamic stability of 70 asphalt mixture. It is concluded that the pavement performance of 13% diatomite modified asphalt mixture can be significantly improved.