High cohesiveness CA mortar

A mortar and polypropylene fiber technology, applied in the field of high cohesive CA mortar, can solve the problems of CA mortar self-leveling ability decline, large dosage, uneven effect, etc., to improve crack resistance and volume stability, improve Anti-settling ability, the effect of preventing the sinking effect

Inactive Publication Date: 2012-02-01
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention is used in CA mortar materials, which is of great help to the anti-lamination and segregation of CA mortar, but its product price is more expensive and the dosage is larger. At the same time, the self-leveling ability of the prepared CA mortar is reduced. When different emulsifiers are used When the emulsified asphalt is produced, the effect is uneven, and it is not suitable for the construction requirements of high-speed railways

Method used

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  • High cohesiveness CA mortar

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Embodiment 1

[0025] The preparation of embodiment 1, CA mortar

[0026] (1) Preparation of dry powder: mix PI 42.5 cement, expansion agent, river sand (fineness modulus of 1.4) and aluminum powder (200 mesh) and stir evenly to obtain dry powder; among them, PI 42.5 cement, UEA expansion agent , The mass-number ratio of river sand and aluminum powder is 90:10:200:0.015;

[0027] (2) Preparation of CA mortar: Mix slow-cracking cationic emulsified asphalt, water, polycarboxylate superplasticizer, polyurethane thickener (dissolved well in water) and rosin thermal polymer air-entraining agent (dissolved well in water). Stir evenly to obtain a liquid mixture, put the liquid mixture into the dry powder obtained in the previous step and stir evenly, then add a silicone defoamer for defoaming to obtain CA mortar; among them, PI 42.5 cement, expansion agent, river sand, The mass-number ratio of the emulsified asphalt, water, water reducer, air-entraining agent, defoamer, aluminum powder and thicken...

Embodiment 2

[0029] Embodiment 2, the preparation of CA mortar

[0030] (1) Preparation of dry powder: mix PI 52.5 cement, expansion agent, river sand (fineness modulus 1.8) and aluminum powder (250 mesh) and stir evenly to obtain dry powder; among them, PI 52.5 cement, UEA expansion agent , The mass-number ratio of river sand and aluminum powder is 90:10:200:0.015;

[0031] (2) Preparation of CA mortar: Mix slow-cracking cationic emulsified asphalt, water, polycarboxylate superplasticizer, polyurethane thickener (dissolved well in water) and rosin thermal polymer air-entraining agent (dissolved well in water). Stir evenly to obtain a liquid mixture, put the liquid mixture into the dry powder obtained in the previous step and stir evenly, then add a silicone defoamer for defoaming to obtain CA mortar; among them, PI 52.5 cement, expansion agent, river sand, The mass-number ratio of emulsified asphalt, water, water reducer, air-entraining agent, defoamer, aluminum powder and thickener is 9...

Embodiment 3

[0033] Embodiment 3, the preparation of CA mortar

[0034] (1) Preparation of dry powder: mix PII 42.5 cement, expansion agent, river sand (fineness modulus 1.5) and aluminum powder (250 mesh) and stir evenly to obtain dry powder; among them, PII 42.5 cement, UEA expansion agent , The mass-number ratio of river sand and aluminum powder is 90:10:200:0.015;

[0035] (2) Preparation of CA mortar: Mix slow-cracking cationic emulsified asphalt, water, polycarboxylate superplasticizer, polyurethane thickener (dissolved well in water) and rosin thermal polymer air-entraining agent (dissolved well in water). Stir evenly to obtain a liquid mixture, put the liquid mixture into the dry powder obtained in the previous step and stir evenly, then add a silicone defoamer for defoaming to obtain CA mortar; among them, PII 42.5 cement, expansion agent, river sand, The mass-number ratio of emulsified asphalt, water, water reducer, air-entraining agent, defoamer, aluminum powder and thickener is ...

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Abstract

The invention provides a CA mortar. The CA mortar comprises cement, an expanding agent, sand, emulsified bitumen, a water reducer, a thickening agent, aluminum powder and water. The mass part ratio of cement to expanding agent to sand to emulsified bitumen to water reducer to thickening agent to aluminum powder to water is 90: (10-15): 200: (140-160): (1.5-2.0): (0.1-0.5): (0.01-0.015): (20-40); the thickening agent is a polyurethanes thickening agent. According to the invention, the polyurethane thickening agent is taken as an auxiliary agent for raising the viscosity of the CA mortar, is capable of substantially raising the anti-sedimentation capability of the CA mortar without affecting the fluidity of the CA mortar, and increases the cohesiveness of the CA mortar; simultaneously polypropylene fiber is added for further preventing the sink effect of coarse particles and raising the crack resistance and volume stability of the CA mortar.

Description

technical field [0001] The invention relates to a high-cohesive CA mortar suitable for intercity high-speed railways, urban high-speed light rails and urban subways. Background technique [0002] High-speed railway marks the level of a country's railway modernization and is a symbol of a country's overall strength. In order to meet the requirements of track stability, durability and comfort during high-speed operation, high-speed railway construction adopts ballastless track with good structural integrity. The ballastless track is composed of concrete track bed, CA mortar layer, track slab and other parts, among which CA mortar is used as the structural layer between the track slab and the concrete track bed, mainly supporting the track slab and buffering the load of high-speed trains. [0003] The CA mortar construction adopts the pouring method, which has high requirements on the fluidity of the mortar, but the high fluidity will affect the homogeneity, resulting in segre...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B28/04
Inventor 王金凤张玉贞谭忆秋欧阳剑李云良陈瑶葛勇孟良
Owner CHINA NAT OFFSHORE OIL CORP
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