木质素/玻璃纤维复合改性沥青混凝土路用性能提升效果研究

Composite Modification with Cellulose Fiber/Glass Fiber to Enhance the Pavement Performance of Asphalt Concrete

基于纤维改性沥青混凝土路用性能强化提升需求,提出了采用木质素纤维(CF)/玻璃纤维(GF)复合改性沥青混凝土路用性能的方法,研究了复合纤维组成对沥青混凝土路用性能的影响机理.结果表明:CF/GF复合改性有效提升了沥青混凝土的高温稳定性,并具有良好的水稳定性和低温性能;当CF/GF以质量比1∶3掺入时,沥青混凝土动稳定度为单掺CF组的2.2倍;试件低温破坏时,最大弯拉应变提升13.3%.复合纤维具有吸附、加筋及阻滞裂纹的作用,强化了沥青混凝土在温度变化、水损及应力作用下的稳定性,从而提高了其路用耐久性能.

Cellulose fiber(CF)and glass fiber(GF)have been selected for asphalt concrete reinforcement to cope with the drawbacks of insufficient enhancement in comprehensive properties.Furthermore,the mechanism of fiber composite modification was explored by determining the pavement performance of asphalt concrete with varying proportions of CF/GF.The results indicate that the composite modification process of CF/GF improves high-temperature property,low-temperature performance and water stability of asphalt concrete effectively.As the mass ratio of CF/GF is 1∶3 in asphalt concrete,the dynamic stability is 2.2 times that of the CF modified asphalt concrete.The maximum flexural-tensile strain is 13.3%higher than that of the CF modified asphalt concrete when the specimens are subjected to low-temperature damage.This enhancement can be attributed to the functional aspects which is originated from the adsorption,reinforcement,and crack retarding of composite fibers in the matrix of asphalt concrete,thus the durability is improved under the coupling effects of temperature changes,moisture damage,and stress loading.