环保型复合融雪盐化物沥青胶浆性能研究

Study on performance of environmental friendly compound snow-melting salted asphalt mortar

采用等体积替换法,在1∶1粉胶比条件下用盐化物置换沥青胶浆中的矿粉,制备不同替代率的盐化物沥青胶浆。采用针入度、延度及弹性恢复试验,分析替代率对盐化物沥青胶浆常规性能的影响;通过布氏粘度试验,回归分析替代率、温度对盐化物沥青胶浆粘温特性的影响;以低温弯曲梁流变试验,研究盐化物沥青胶浆的低温性能,分析替代率、温度对盐化物沥青胶浆低温性能的影响。结果表明,盐化物的掺入,会降低沥青胶浆的针入度、延度,同时会使沥青胶浆的弹性恢复出现明显提高。温度越高,盐化物替代率对沥青胶浆粘度影响越显著,盐化物沥青胶浆的温度敏感性随盐化物替代率的变化先增大后减小;随着温度下降,沥青胶浆性能逐渐劣化,当替代率小于75%时,沥青胶浆蠕变劲度模量增长缓慢,蠕变速率下降不明显,但替代率高于75%时,沥青胶浆低温性能迅速衰减。掺入适量盐化物对沥青胶浆低温性能影响不大。

The asphalt mortar were prepared under the condition of 1∶1 powder-to-binder ratio,in which mineral filler was replaced with different salt compounds shares.The effects of substitution rate on the conventional properties of salted asphalt mortar were analyzed by penetration,ductility and elastic recovery tests.Based on the results of Brookfield viscosity test,the influence of substitution rate and temperature on the viscosity-temperature characteristics of salted asphalt mortar was investigated by regression analysis.The low temperature performance of the salted asphalt mortar was studied by low temperature bending beam rheological test,and the influence of substitution rate and temperature on the low temperature performance of the salted asphalt mortar was analyzed.The results show that the addition of salt compounds can reduce the penetration and ductility of the asphalt mortar,and at the same time,the elastic recovery of the asphalt mortar is significantly improved.With the increase of temperature,the effect of salt substitution rate on the viscosity of asphalt mortar is more obvious.The temperature sensitivity of salted asphalt mortar increases first and then decreases with the increase of salt substitution rate.With the decrease of temperature,the performance of asphalt mortar decreases gradually.The creep modulus of asphalt mortar increases slowly and the creep rate decreases slightly when the substitution rate of salts is less than 75%.However,when the substitution rate is more than 75%,the low temperature performance of asphalt mortar decreases sharply,and the substitution rate of salt has little effect on the low temperature performance of asphalt mortar.