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Application of ultra-high early strength polycarboxylic acid water reducer to preparation of precast concrete component

A technology of prefabricated components and strong polycarboxylate, applied in the field of super-early-strength polycarboxylate superplasticizer, can solve the problems of long mold turnover period, slow strength growth, long setting time, etc.

Active Publication Date: 2016-05-04
GUANGDONG REDWALL NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Concrete formulated with ordinary high-performance polycarboxylate superplasticizers has a long setting time, slow cement hydration, and slow strength growth, resulting in long mold turnover cycles

Method used

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  • Application of ultra-high early strength polycarboxylic acid water reducer to preparation of precast concrete component
  • Application of ultra-high early strength polycarboxylic acid water reducer to preparation of precast concrete component
  • Application of ultra-high early strength polycarboxylic acid water reducer to preparation of precast concrete component

Examples

Experimental program
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Effect test

Embodiment 1

[0089] A kind of embodiment of the preparation method of concrete prefabricated member described in the present invention, described method comprises the following steps:

[0090] The concrete is poured into the mold to obtain the primary body of the prefabricated component. After the primary body of the prefabricated component is naturally cured for 12 hours, the demoulding strength reaches 30 MPa, and then the natural curing is continued to obtain the concrete prefabricated component.

[0091] The concrete comprises the following components by weight: 370 parts of cement, 715 parts of sand, 1025 parts of gravel, 80 parts of fly ash, 5 parts of super early strength polycarboxylate superplasticizer and 135 parts of water.

[0092] The super early strength polycarboxylate water reducer is prepared by the following method:

[0093] (1) Synthesis of methoxyl hydroxyl PEG intermediate

[0094] Inject 5mol of methanol, 25mol of ethylene oxide, 5mol of epichlorohydrin and 1g of sodiu...

Embodiment 2

[0102] A kind of embodiment of the preparation method of concrete prefabricated member described in the present invention, described method comprises the following steps:

[0103] The concrete is poured into the mold to obtain the initial body of the prefabricated component, and after 15 hours of natural curing of the primary body of the prefabricated component, the demoulding strength reaches 35 MPa, demoulding, and then the natural curing is continued to obtain the concrete prefabricated component.

[0104] The concrete comprises the following components by weight: 405 parts of cement, 735 parts of sand, 1040 parts of gravel, 120 parts of fly ash, 8 parts of super early strength polycarboxylate superplasticizer and 145 parts of water.

[0105] The super early strength polycarboxylate water reducer is prepared by the following method:

[0106] (1) Synthesis of methoxyl hydroxyl PEG intermediate

[0107] Inject 5mol methanol, 1000mol ethylene oxide, 250mol propylene oxide, 75...

Embodiment 3

[0115] A kind of embodiment of the preparation method of concrete prefabricated member described in the present invention, described method comprises the following steps:

[0116] The concrete was poured into the mold to obtain the initial body of the prefabricated component, and after natural curing of the initial body of the prefabricated component for 13 hours, the demoulding strength reached 33.5 MPa. After demoulding, the natural curing is continued to obtain the concrete prefabricated components.

[0117] The concrete comprises the following components by weight: 380 parts of cement, 720 parts of sand, 1028 parts of gravel, 90 parts of fly ash, 5.5 parts of super early strength polycarboxylate superplasticizer and 136 parts of water.

[0118] The super early strength polycarboxylate water reducer is prepared by the following method:

[0119] (1) Synthesis of methoxyl hydroxyl PEG intermediate

[0120] Inject 5 mol of methanol, 50 mol of ethylene oxide, 500 mol of epoxy...

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Abstract

The invention discloses a preparation method of a precast concrete component. The method comprises the following steps: natural curing is carried out for a precast component preliminary body which is formed after concrete pouring, demoulding is carried out when the precast component preliminary body reaches demoulding strength, natural curing is continuously carried out, and the precast concrete component is obtained. The concrete comprises following components: cement, aggregates, an ultra-high early strength polycarboxylic acid water reducer and water; the super early strength polycarboxylic acid water reducer is a compound shown in the formula (I) or the formula (II). The invention also discloses a precast concrete component which is prepared by the preparation method of the precast concrete component. The ultra-high early strength polycarboxylic acid water reducer is used for promoting cement hydration, any activity enhancing admixtures are not added, a concrete mix ratio is optimized, and finally die stripping time of the precast concrete component is shortened from 30-40 hours to 12-15 hours; turnover period of the die is accelerated, and economic benefit is improved.

Description

technical field [0001] The invention relates to the use of a super early strength polycarboxylate water reducer, in particular to the use of a super early strength polycarboxylate water reducer in preparing concrete prefabricated components. Background technique [0002] Prefabricated concrete structure is one of the most important structural forms of modern buildings. It has the advantages of saving materials and labor, improving construction efficiency, speeding up construction progress, and improving product quality of construction projects. From the perspective of environmental protection and energy saving, the application of precast concrete technology can reduce environmental pollution and achieve greater economic benefits. Precast concrete structures have great development prospects in our country. [0003] The construction method of prefabricated concrete structure is a rapid construction technology that uses construction machinery such as cranes to assemble and inst...

Claims

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Application Information

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IPC IPC(8): C04B24/32C08G65/333C08G65/332C08G65/28C04B103/30
CPCC04B24/32C04B2103/302C08G65/2609C08G65/3322C08G65/333
Inventor 张小富赵利华白淑英李论
Owner GUANGDONG REDWALL NEW MATERIALS
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