Cement emulsified asphalt mortar special for high iron plate-type ballastless track and preparation method thereof

Abstract

The invention provides cement emulsified asphalt mortar, which comprises the following components in part by weight: 100 parts of portland cement, 8 to 12 parts of sulfate aluminate cement, 150 to 230 parts of quartz sand, 120 to 170 parts of emulsified asphalt, 10 to 18 parts of polymer emulsion, 0.03 to 0.15 part of defoaming agent and 0.005 to 0.03 part of foaming agent. The product has high workability and high encapsulating performance on cement and dinas, is not layered, does not bleed, has a wider temperature adaptation range due to antifreezing components added into the product system, and can be applied to construction in the temperature range of between 5 and 35 DEG C. The harmonious development of workability, strength, elastic modulus and expansion rate is realized, and the product has high freezing resistance and durability. The application requirements of the high iron plate-type ballastless track can be absolutely met.

Description

Technical field: [0001] The invention belongs to the field of materials, and in particular relates to cationic cement-emulsified asphalt mortar for high-speed iron slab-type ballastless tracks and a preparation method thereof. Background technique: [0002] Today's world railways are developing toward the trend of heavy freight and high-speed passenger transportation, and gradually realize the seamlessness of the line, which has comprehensively improved the smoothness and overall strength of the line, further reduced the loss of rail parts and the workload of maintenance and repair, and the train Operating conditions have also been further improved. The high-speed driving track puts forward high requirements on the subgrade and ballast bed. In order to ensure the strong stability and high smoothness of the track, countries all over the world favor the slab ballastless track. The slab ballastless track is a new type of track structure developed on the Shinkansen high-speed r...

AI Technical Summary

Problems solved by technology

At present, my country has entered a period of rapid development of high-speed railways. However, due to the late start of research on CA mortar in my country and the monopoly and blockade of related technologies by foreign countries, it is difficult for the research and development and application of CA mortar in my country to meet the needs of rapid development of high-speed railways.

[0004] At present, although my country has tried to apply domestic CA mortar in Qinshen Passenger Dedicated Line and Beijing-Tianjin Intercity Rail Transit Project, its application effect is still not ideal.

Chinese patent 200610018437.3 discloses a method for preparing CA mortar material with controllable expansion, which is composed of cement, emulsified asphalt, sand, steel slag, expansion agent, water reducing agent, aluminum powder, etc. The performance is good and stable, but in the actual use process, it is found that its workability is not particularly ideal, and segregation and bleeding often occur. At the same time, it is greatly affected by the ambient temperature. When the temperature is lower than 10°C, the 1-day strength cannot meet the requirements.

Chinese patent 200710049619.1 discloses an emulsified asphalt cement mortar for rails and its preparation method. Although the invention has good workability, the ratio of emulsion to cement is less than the provisions in the provisional technical conditions. Therefore, its actual elasticity after hardening modulus will be larger

The better CA mortars on the market are mainly provided by Japanese and German companies. However, due to their high price, high requirements on the environment and equipment when preparing and laying, and the large geographical span of our country and the complex and changeable climate environment, it is also limited. Large-scale promotion and application in my country