表面有机化LDHs/橡胶粉复合改性沥青高温性能研究

Study on High Temperature Performance of Surface Organic LDHs/Rubber Powder Composite Modified Asphalt

为研究表面有机化层状双羟基复合金属氢氧化物(LDHs)对表面有机化LDHs/橡胶粉复合改性沥青高温性能的影响,文章对基质沥青、橡胶粉改性沥青和表面有机化LDHs/橡胶粉复合改性沥青进行针入度、软化点、延度三大指标与动态剪切流变试验(Dynamic Shear Rheological Test, DSR)和高温力学性能测试。结果表明:加入表面有机化LDHs后,增加了橡胶粉改性沥青的针入度,并提高橡胶粉改性沥青的软化点和延度;在DSR试验中,同一温度条件下,表面有机化LDHs/橡胶粉复合改性沥青的车辙因子显著高于基质沥青和橡胶粉改性沥青。故通过掺加表面有机化LDHs和橡胶粉来提高沥青的耐高温性能具有可行性。In order to study the effect of surface organic Layered Double Hydroxides (LDHs)on the high temperature performance of surface organic LDHs/rubber powder composite modified asphalt, the three indexes of penetration, softening point and ductility of matrix asphalt, rubber powder modified asphalt and surface organic LDHs/rubber powder composite modified asphalt, Dynamic Shear Rheological Test (DSR)and high temperature mechanical properties test were carried out in this paper. The results show that the addition of surface organic LDHs increases the penetration of rubber powder-modified asphalt and improves the softening point and ductility of rubber powder-modified asphalt. In the DSR test, under the same temperature conditions, the rutting factor of the surface organic LDHs/rubber powder composite modified asphalt is significantly higher than that of the matrix asphalt and rubber powder modified asphalt. Therefore, it is feasible to improve the high temperature resistance of asphalt by adding surface organic LDHs and rubber powder.