Research on the modification of waterproof asphalt by synthetic bio-additive
LUO Weixin
WANG Weiwei
WU Meng
QI Guijie
LIU Jinjing
Abstract：To reduce the use of petroleum-based softeners,a synthetic bio-additive based on biomass oil was developed.After adding the synthetic bio-additive to aged asphalt for regeneration,in the four-component test of asphalt,the polar components mi-grated,and the actual content of asphaltenes decreased by 41.7%compared to the theoretical value,while the actual content of sat-urates increased by 37.5%compared to the theoretical value.The waterproof modified asphalt coating material test showed that when the synthetic bio-additive was synthesized with a mass ratio of cashew nut shell oil to waste cooking oil of 5:5,compared with the same dosage of waste engine oil,the low-temperature flexibility of the waterproof modified asphalt decreased by 1℃,the low-temperature flexibility decline after thermal aging reduced by 25%,and the joint peel strength increased by 0.2 N/mm.Under the same cost-effectiveness,the addition amount of softeners was reduced by 1 percentage point,thereby reducing the cost of wa-terproof materials.The synthetic bio-additive has an activation effect on rubber powder,making the segregation of the system re-duce greatly,thereby improving the thermal stability of the modified asphalt coating material.
Keywords：cashew nut shell oilwaste cooking oilsynthetic biological additiveasphalt regenerationactivated rubber
Publication Date：2026-02-25
Online Publishing Date：2026-03-25(First online date of this platform, not the publication date of the document)
Pages：5( 76-80 )