Analysis of Cause for Quality Problems of Cement Emulsified Asphalt Mortar and Prevention

Research purposes: In high-speed railway construction,the cement emulsified asphalt mortar is used as the elastic cushion between the track slab and the concrete base plate and it is one of key engineering structures,so its property is crucial to the regularity and durability of the track structure and to the comfortableness and security of train.The various quality defects may happen in the course of hardening of the cushion of the cement emulsified asphalt mortar to destroy the cohering property between the track slab and rail base plater because of a little working experience,the improper operation and the impact of the external environment.Therefore,it is necessary to analyze the cause for the quality defects and take the effective measures. Research conclusions:Based on the construction practice of cement emulsified asphalt mortar cushion for a CRTSII slab ballastess track of one high-speed railway,the analysis is made for the causes for the common problems after pouring in the course of construction of,namely,the micro cracks happen in the joint area between the slab and the mortar or the mortar is not full and slices in some areas,and a large number of the tiny bubbles,the larger bubbles,the bubbles of connecting each other from top to down happen and the asphalt bead separate out.The relative measures are presented from the fields of the edge banding technique for the track slab,the pouring technique,the mixing technique and the control of raw materials to improve the construction quality and it can be as the reference to the similar works.