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Method for preparing cement asphalt (CA) mortar for China railway track system (CRTS) II slab ballastless tracks

A slab ballastless track and mortar technology, which is applied in the field of high-speed railway construction engineering materials, can solve the problems that CA mortar is prone to flooding, high water consumption and additive dosage, and poor fluidity of CA mortar, so as to avoid competitive adsorption and reduce dosage. and water consumption, the effect of increasing strength

Inactive Publication Date: 2011-05-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the study found that when the fluidity requirements of the CA mortar mixed by this process are the same, and other conditions are the same, the amount of water and additives is relatively high, and the CA mortar is prone to bleed; the ratio of raw materials Under the same conditions, the CA mortar obtained by mixing has poor fluidity and low strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2

[0023] Examples 1-2: 52.5 ordinary cement produced by Conch Cement Factory, polycarboxylate high-performance water reducer, AEA sulfoaluminate expansion agent and organic silicon defoamer produced by Hangzhou Construction Components Company Additive Factory , fine sand with a particle size of 1.18mm, aluminum powder provided by Hangzhou Aerated Concrete Factory, silica sol produced by Zhejiang Yuda Chemical Co., Ltd., with a mass concentration of 30%, pH=9.0, and anion produced by Zhejiang Lanting Hi-Tech Co., Ltd. Type common emulsified asphalt to prepare CA mortar. Described CA mortar preparation method is as follows:

[0024] First, mix cement, expansion agent, aluminum powder and fine sand according to the proportions of each example in Table 1 to prepare dry CA mortar powder, then add polycarboxylic acid high-performance water-reducing powder to the water according to the proportions of each example in Table 1 Add agent, defoamer and silica sol, stir at slow speed (60rpm...

Embodiment 3～7

[0030] Examples 3 to 7: 52.5 ordinary cement produced by Conch Cement Factory, polycarboxylate high-performance water reducer, AEA sulfoaluminate expansion agent and organosilicon defoamer produced by Hangzhou Construction Components Company Additive Factory , fine sand with a particle size of 1.18mm, aluminum powder provided by Hangzhou Aerated Concrete Factory, silica sol produced by Zhejiang Yuda Chemical Co., Ltd., with a mass concentration of 20%, pH=8.0, and anion produced by Zhejiang Lanting Hi-Tech Co., Ltd. Type SBS modified emulsified asphalt to prepare CA mortar. Described CA mortar preparation method is as follows:

[0031] First, mix cement, expansion agent, aluminum powder and fine sand according to the proportions of each example in Table 2 to prepare CA mortar dry powder, then add polycarboxylic acid high-performance water-reducing powder to the water according to the proportions of each example in Table 2 Add agent, defoamer and silica sol, stir at slow speed...

Embodiment 8～9

[0038] Examples 8-9: 52.5 ordinary cement produced by Jinfeng Cement Factory, polycarboxylate high-performance water reducer, AEA sulfoaluminate expansion agent and organosilicon defoamer produced by Additive Factory of Hangzhou Construction Components Company , fine sand with a particle size of 1.18mm, aluminum powder provided by Hangzhou Aerated Concrete Factory, silica sol produced by Zhejiang Yuda Chemical Co., Ltd., with a mass concentration of 40%, pH=10.0, and anion produced by Zhejiang Lanting Hi-Tech Co., Ltd. Type SBR modified asphalt emulsion to prepare CA mortar. Described CA mortar preparation method is as follows:

[0039]First, mix cement, expansion agent, aluminum powder and fine sand according to the ratio of each embodiment in Table 2 to prepare CA mortar dry powder, and then add polycarboxylic acid high-performance water-reducing powder to the water according to the ratio of each embodiment in Table 2 Add agent, defoamer and silica sol, stir at slow speed (...

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Abstract

The invention discloses a method for preparing cement asphalt (CA) mortar for China railway track system (CRTS) II slab ballastless tracks, which comprises the following steps of: (1) mixing cement with fine sand, an expanding agent and aluminum powder according to proportion to prepare dry CA mortar powder; and (2) sequentially adding a poly carboxylic acid serving as a high-performance water reducing agent, an antifoaming agent and silica sol into water for uniform stirring, adding the dry CA mortar powder for uniform stirring, and adding asphalt emulsion for uniform stirring to obtain the CA mortar for the CRTS II slab ballastless tracks. The method has the advantages of: (1) avoiding cement particles competitively absorbing an emulsifier in the asphalt emulsion, and preventing the asphalt emulsion in the CA mortar from being demulsified to cause bleeding; and (2) reducing the using amount of the asphalt emulsion and the using amount of the water on the basis of ensuring flowability, and strengthening the strength of the CA mortar on the basis of meeting an elastic modulus of the CA mortar.

Description

(1) Technical field [0001] The invention relates to a preparation method of CA mortar for CRTS II slab ballastless track, belonging to the technical field of high-speed railway construction engineering materials. (2) Background technology [0002] With the rapid development of the national economy, my country will build a high-speed railway network with four vertical and four horizontal passenger dedicated lines, with a design speed of up to 350km / h or more. In order to improve the stability and safety of high-speed train operation and reduce the workload of track maintenance, various forms of ballastless tracks have been developed abroad, among which slab track is one of the most mature tracks, and it has become a development trend to lay a large number of high-speed railways in developed countries. The characteristic is that a concrete base is laid on the roadbed, and a prefabricated track slab is placed on the base, with a gap of 40-50mm reserved between them, and cement ...

Claims

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Application Information

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IPC IPC(8): C04B38/02C04B28/00
Inventor 钱晓倩方明晖孟涛钱匡亮朱蓬莱
Owner ZHEJIANG UNIV
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