不同标号沥青胶浆流变性能研究

Study on Rheological Properties of Asphalt Mastic with Different Grades

摘要:

采用4种标号沥青和4个粉胶比制备16种沥青胶浆，在不同频率和温度下进行动态剪切流变试验，通过温度扫描试验获取不同温度下的复数剪切模量、相位角、车辙因子和复数模量主曲线。方差分析表明：沥青胶浆复数剪切模量随着沥青标号的减小及粉胶比的增大而增大；沥青胶浆相位角随着沥青标号增大而增大，而与粉胶比相关性不大。在5℃低温下，粉胶比对沥青胶浆的力学性能影响更显著；在15℃中温下，粉胶比及沥青种类对沥青胶浆的力学性能影响水平大致相同；在60℃高温下，沥青种类对沥青胶浆的力学性能影响更显著。沥青胶浆在不同温度下复数剪切模量G*、相位角δ、车辙因子G*/sinδ的影响因素分析结果表明：在中高温条件下，沥青种类对胶浆流变性能影响最为显著。

Abstract:

The 16 kinds of asphalt mastic are prepared by 4 asphalt grades and 4 filler/asphalt ratios. The dynamic shear rheological tests are conducted at the different frequencies and temperatures. The main curves of complex shear modulus, phase angle, rutting factor and complex modulus at different temperatures are obtained by the temperature sweep test. By the variance analysis, the complex shear modulus of asphalt mastic increases as the asphalt grade decreases and filler/asphalt ratio increases. The phase angle of asphalt increases as the asphalt grade increases, but does not have a significant correlation with the filler/asphalt ratio. At 5℃ low temperature, the filler/asphalt ratio has a significant impact on the mechanical property of asphalt mastic. At 15℃, the filler/asphalt ratio has a similar impact on the mechanical property of asphalt mastic as the asphalt type. At 60℃, the asphalt type has a significant impact on the mechanical property of asphalt mastic. Through the analysis of the complex shear modulus G*, phase angle δ, rutting factor G*/sin δ at different temperatures, the asphalt type has the most significant impact on the rheological property of asphalt mastic under medium to high temperature conditions.