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Controllable expansion CA mortar material

A technology of mortar material and expansion agent, applied in the field of CA mortar material, can solve the problems of long cement hydration process, affecting the track elevation, affecting the service life of the railway, etc., to improve frost resistance and durability, broad application prospects, eliminate adverse effects

Inactive Publication Date: 2007-09-19
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the CA mortar material itself will shrink during the process of emulsified asphalt demulsification and cement hydration, the current CA mortar products prepared from basic raw materials such as emulsified asphalt, cement, sand, and air-entraining agent are only used in a short period of time after pouring ( within 24 hours) there will be expansion phenomenon, but the hydration process of cement is longer, and CA mortar will also shrink in the later stage, which directly affects the elevation of the track and even affects the service life of the railway
Since the construction of ballastless track in our country has just started, there are few studies on CA mortar, and the existing CA mortar products do not solve these problems well.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, embodiment 2, embodiment 3 adopt the first kind of preparation method: all raw materials drop into together, stir simultaneously.

Embodiment 4

[0021] Example 4 adopts the second preparation method, first dry mixing and then adding the rest of the liquid raw materials for wet mixing.

[0022] From the table, we can see that the expansion rate of the CA mortar mixed with expansion agent and aluminum powder decreases in the later stage, indicating that it is shrinking. The CA mortar with finely ground steel slag powder, concrete expansion agent and aluminum powder as the expansion source In the early stage (within 24h), there is slight expansion, and in the late stage (≥28d), the expansion rate remains basically unchanged.

[0023] The properties of the CA mortar prepared by the two preparation methods are not much different, but the compressive strength of the CA mortar prepared by the second method is slightly higher than that of the CA mortar prepared by the first method.

Embodiment 5

[0025] A CA mortar material with controllable expansion, which is mainly composed of cement, emulsified asphalt, sand, finely ground steel slag powder, expansion agent, aluminum powder, water and water reducing agent. The parts by weight of each raw material are: Cement: 100 parts, emulsified asphalt: 50 parts, sand: 350 parts, finely ground steel slag powder: 5 parts, expansion agent: 5 parts, aluminum powder: 0.1 part, water reducing agent: 1 part, water: 80 parts. The ground steel slag powder adopts the converter steel slag that has been ground and naturally stored for 3 months, and the specific surface area is 300-600m 2 / kg, and the MgO content is 4-16%. The expansion agent is selected from alunite expansion agent; the cement is early-strength ordinary Portland cement, which is early-strength 32.5 Portland cement; the emulsified asphalt is slow-cracking emulsified asphalt, with a mass solid content of 55-76 %; the sand is ordinary fine river sand with a fineness modulus ...

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Abstract

The present invention relates to a kind of controllable expansion CA mortar material for city railway. It is prepared with cement 100 weight portions, emulsified asphalt 50-250 weight portions, sand 1-350 weight portions, ground steel slag powder 5-50 weight portions, expanding agent 5-30 weight portions, aluminum powder 0.1-3 weight portions, water reducing agent 1-10 weight portions and water 0-80 weight portions, and through mixing; and the ground steel slag powder is ground converter steel slag after storing naturally for 3-6 month and has specific surface area of 300-600 sq m / kg and MgO content of 4-16 %. The controllable expansion CA mortar material can make CA mortar produce micro expansion in both early stage and the later stage to eliminate the bad influence of CA mortar material shrinkage and raise the antifreezing performance and durability of CA mortar.

Description

technical field [0001] The invention relates to a CA mortar material with controllable expansion, which is suitable for intercity high-speed railway, urban high-speed light rail and urban subway. Background technique [0002] With the enhancement of comprehensive national strength, my country's high-speed railway network construction plan will be gradually put into practice. It is estimated that before 2020, my country will initially build a high-speed railway network with a speed of more than 200km / h. CA mortar is a key component of slab ballastless track. On the one hand, it can make the track have reasonable elasticity, and on the other hand, it is convenient to adjust the track construction error. Therefore, the use of CA mortar elastic damping material is very important for improving the safety and ride quality of trains at high speeds. Comfort plays a very important role. In addition, compared with high-elastic rubber materials, it also has the advantages of good cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B24/36C04B22/04C04B14/06
Inventor 丁庆军王发洲王涛胡曙光叶家军周宇飞高涛彭斌
Owner WUHAN UNIV OF TECH
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