Due to the influence of external environment,the service performance of cementitious materials for ballastless track of high speed railway gradually declines.The surface of cementitious materials is coated with two types of materials,permeable crystallization materials and epoxy resins.The effects of surface treatment on the mechanical properties,wear resistance,frost resistance,anti-chloride ion permeability and microstructure of cementitious materials were compared through experiments.The results show that surface coating with permeable crystallization materials and epoxy resins can improve the surface rebound strength of cementitious materials and increase the number of freeze-thaw cycles,and reduce the chloride ion diffusion coefficient.Compared with the pre-treatment,the surface rebound strength was improved by 5.0%and 10.1%,the number of freeze-thaw cycles was increased by 140 and more than 183 respectively(relative dynamic modulus of elasticity 60%),and the chloride ion diffusion coefficient were reduced by 64.0%and 92.5%after the surface was coated with the permeable crystallization material and epoxy resin.Epoxy resins provide more significant performance enhancement,but are subject to failure due to aging of the material.Compared with the pre-treatment,the application of the permeable crystallization material also improved the mechanical properties of the cementitious material with an increase in compressive strength of 11.5%and the application of the epoxy resin enhanced the wear resistance of the cementitious material with a reduction of 19.5%in abrasion mass.Thus,selecting appropriate surface treatment materials depends on the application environment,with permeable crystallization materials suitable for environments prone to aging and epoxy resin ideal for addressing freeze-thaw,ion intrusion,and abrasion damage.
维普
万方数据