The Studies Of Preparation And Performance Of Complex Asphalt Emulsion For CA Mortar

Cement Asphalt (CA) emulsion mortar is a new kind of inorganic and organic composite material for grouting which is composed of cement, asphalt emulsion, water, and other things. CA mortar is the key component of elastic adjustment layer used in the plate-type track without sub ballast for high-speed railway, and one core technology of plate-type track. Asphalt emulsion is the key material of CA mortar, and affects its character of service.The results of orthogonal test indicate that emulsifier 1831 and Y are the major factors which affect performance indexes of asphalt emulsion, and emulsifier X is the secondary cause which effects less relatively. The consistence is best between asphalt emulsion and cement with proportion 3:1:1, and the storage stability of asphalt emulsion with proportion 2:2:1 shows best. The contents of residues of asphalt emulsion accord with standard request, and this shows emulsifying effectiveness of the three emulsifying agents is good. Higher total content of emulsifiers does not mean better stability, but higher content of 1831 presumes better storage stability of emulsified asphalt, for the content of 1831 has a great influence on the storage stability of asphalt emulsion. The information of storage stability for five days accords with standard, but for one day.The consistence between cement and different asphalt emulsion conforms to standard. This shows the asphalt emulsion prepared with the three emulsifiers has a good consistence with cement, and can be used to prepare CA mortar used in the plate-type track without sub ballast for high-speed railway. Be contrary to the storage stability, the compatibility with cement is reduced when the content of emulsifier 1831 is raised. So, the content of 1831 should be controlled well when the three emulsifying agents are selected to prepare asphalt emulsion for CA mortar.Linear relationship of fluid curve of asphalt emulsion is better, and asphalt emulsion tends to be Bingham plastic fluid, when experiment temperature is comparatively higher. Apparent viscosity of emulsified asphalt is sensitive to both the change of rate of shear and experiment temperature and it drops when rate of shear gets larger or temperature rises. The content and proportion of emulsifiers affects viscosity- temperature curve highly.Distribution of particle size of asphalt emulsion is Gaussian distribution, and this shows particle size is comparatively equality, and particle size distribution is relatively concentrated. But in general, average particle size is large, which illustrates particle size of asphalt emulsion is large prepared by homogenizer.