硅藻土、粉煤灰漂珠对沥青胶浆性能影响研究

Effect of Diatomiteand Fly-ash Floating Beads on Performance of Asphalt Mortar

采用等体积替换的方式,以10%或20%的硅藻土替换矿粉,25%或50%的粉煤灰漂珠替换矿粉,分别制备沥青胶浆并进行锥入度试验、测力延度试验和流变性能试验。试验结果表明:硅藻土或粉煤灰漂珠替换部分矿粉后,在各粉胶比下,沥青胶浆的抗剪强度得到提升,且硅藻土的提升效果较为明显;硅藻土或粉煤灰漂珠的掺入,使测力延度峰值拉力增大,延伸度减小。当粉胶比为1.2时,硅藻土替代量为10%的沥青胶浆低温延度变形能J达到最大,粉煤灰漂珠替代量为25%的沥青胶浆也具有较高的变形能,与普通沥青胶浆相比均具有更好的低温性能。流变试验结果指出,硅藻土对沥青胶浆的车辙因子影响较大,且随替换量的增加,车辙因子明显增大,而粉煤灰漂珠仅当替换量达到50%才显示出较好的高温抗车辙能力。

The mineral powder is replaced with diatomite in volume of 10%and 20%,and replaced by fly-ash floating beads in volume of 25%and 50%to respectively prepare asphalt mortar in order to perform cone penetration test,force ductility test and rheological property test.The results show that,after replacing the mineral powder with diatomite or fly-ash floating beads,the shear strength of the asphalt cement is improved under each powder to rubber ratio,and the lifting effect of diatomite is more obvious.The incorporation of diatomite or fly-ash floating beads increases the peak tensile force of the force measurement ductility and decreases the elongation.When the ratio of powder to rubber is 1.2,the low temperature ductility deformation of asphalt cement with 10%substitution of diatomite can reach the maximum,and the asphalt cement with 25%replacement of fly-ash floating beads also has higher deformation energy.Ordinary asphalt cement has better low temperature performance.The rheological test results indicate that diatomite has a great influence on the rutting factor of asphalt cement,and with the increase of the replacement amount,the rutting factor increases obviously,but when the replacement amount of fly-ash floating beads reaches 50%,good high temperature resistance to rutting is obvious.