Influence of bamboo fiber pre-treatment on rheological and cracking properties of asphalt mortar
To solve the problems of uneven dispersion and easy agglomeration of bamboo fibers in the use of asphalt and mixtures,bamboo fibers were pre-treated with a silane coupling agent,alkali treat-ment,and heat treatment.Rheological properties such as temperature and frequency scanning were test-ed on the three types of bamboo fiber asphalt mortars that had been pretreated,and the effect of fiber pretreatment on the complex shear modulus and phase angle of bamboo fiber asphalt mortar was ana-lyzed.Its G-R constant and phase angle were calculated to evaluate the cracking risk of asphalt mortar by constructing a black space map with R parameters.The results show that the bamboo fiber asphalt mastic treated with silane coupling agent has the best improved rheological properties,with the complex shear modulus increased by 140%and the phase angle decreased by 3.6%compared with that of ma-trix asphalt;the heat treatment method is the second best,with the complex shear modulus increased by 49.1%,the phase angle decreased by2.4%,and the risk of cracking is small;however,the G-R constant of bamboo fiber asphalt mastic treated with silane coupling agent reaches 306.53,which has a greater risk of cracking.Taking into account the effects of three pre-treatment methods on the rheologi-cal and cracking properties of bamboo fiber asphalt mortar,it is found that adding bamboo fibers to as-phalt through heat treatment can better improve the rheological properties of asphalt and avoid signifi-cant cracking risks.
国家科技期刊平台
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