Study on Performance of Fiber-toughened Waterborne Epoxy Emulsified Asphalt Mixture
In order to enhance the toughness of waterborne epoxy emulsified asphalt mixture,3 different types of fiber materials,namely wood fiber,polyester fiber,and basalt fiber,are utilized.The influencing rules on engineering performance of the waterborne epoxy emulsified asphalt mixture with different dosages(0.2％,0.4％,0.6％)is investigated.Marshall stability test,uniaxial compression creep test,low-temperature splitting test,freeze-thaw splitting test,dynamic modulus test and indirect tensile fatigue test are conducted on 9 groups of fiber-modified waterborne epoxy emulsified asphalt mixtures.The evaluation indicator results are obtained including Marshall stability,creep deformation,failure tensile strain,freeze-thaw splitting tensile strength ratio,dynamic modulus,and fatigue life.Comparative analysis is carried out with the performance of blank samples.The result shows that the optimal emulsion content of mixture increases with the addition of fibers.The bond strength among aggregates is enhanced significantly,and the resistance to water damage is improved effectively.Simultaneously,fiber modification has a significant influence on the toughness and expansibility of waterborne epoxy emulsified asphalt mixture.The maximum failure tensile strain in the low-temperature splitting test for the fiber-toughened mixture increases by 33.6％at most.Based on the effect of fibers on improving the performance of waterborne epoxy emulsified asphalt mixtures,basalt fiber exhibits the best performance,followed by polyester fiber,and wood fiber ranking third.Considering both engineering performance and cost-effectiveness,recommended dosages for wood fiber,polyester fiber and basalt fiber are determined as 0.2％,0.2％,and 0.4％respectively.It is worth noting that a high dosage of fibers may lead to poor dispersion in the mixture and to form mechanical weak points.Therefore,caution should be exercised in selecting fiber dosages.
NETL
NSTL
万方数据
