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A kind of polycarboxylate superplasticizer for pumping concrete with superfine sand for aluminum mold

A technology for pumping concrete and polycarboxylate, which is applied in the field of concrete, can solve the problems of poor concrete surface finish, high sensitivity of water reducing agent, high amount of cementitious materials, etc., achieve stable strength, reduce slump loss, reduce water The effect of rubber ratio

Active Publication Date: 2021-12-03
中国水利水电第七工程局有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to prepare a new type of calcium lignosulfonate modified polycarboxylate superfine sand pumping concrete water reducer for aluminum alloy formwork to solve the problem of easy segregation, hardening and slump of low-strength grade concrete prepared with superfine sand Large loss, high amount of cementitious material, easy hardening of concrete, high sensitivity of water reducing agent, large slump loss, difficulty in ensuring strength, poor concrete surface finish, etc., are beneficial to alleviate the shortage of sand resources, and the development and utilization of superplasticizers fine sand resource

Method used

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  • A kind of polycarboxylate superplasticizer for pumping concrete with superfine sand for aluminum mold
  • A kind of polycarboxylate superplasticizer for pumping concrete with superfine sand for aluminum mold
  • A kind of polycarboxylate superplasticizer for pumping concrete with superfine sand for aluminum mold

Examples

Experimental program
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Effect test

Embodiment 1

[0040] C20 ultrafine sand pumping concrete preparation: the design density is 2355kg / m 3 , the amount of cementitious material is 305kg / m 3 , superplasticizer dosage 1.8%, water-binder ratio 0.59, sand rate 33.6%.

[0041] Table 1 Mix design of C20 superfine sand concrete (kg)

[0042]

[0043] Table 2 Test results of C20 ultrafine sand concrete

[0044]

Embodiment 2

[0046] C30 superfine sand pumping concrete preparation: the design density is 2356kg / m 3 , the amount of cementitious material is 375kg / m 3 , superplasticizer dosage 1.73%, water-binder ratio 0.43, sand rate 30%.

[0047] Table 3 Mix design of C30 superfine sand concrete (kg)

[0048]

[0049] Table 4 Test results of C30 ultrafine sand concrete

[0050]

Embodiment 3

[0052] C40 superfine sand pumping concrete preparation: the design density is 2384kg / m 3 , the amount of cementitious material is 400kg / m 3 , superplasticizer dosage 1.8%, water-binder ratio 0.4, sand rate 30%.

[0053] Table 5 Mix design of C40 superfine sand concrete

[0054]

[0055] Table 6 Test results of C40 ultrafine sand concrete

[0056]

[0057] The results of the implementation example illustrate: the implementation example combines the specific performance characteristics of the raw materials, adopts a lower sand rate and a reasonable continuous gradation for design, and uses calcium lignosulfonate modified polycarboxylate composite water reducer to ensure the original Without reducing the water reducing rate of polycarboxylate superplasticizer, the production cost of polycarboxylate superplasticizer is reduced, and it also has faster dispersion, lower viscosity and good slump retention effect, and ensures the concrete strength and surface finish. S95 gra...

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Abstract

The invention discloses a polycarboxylate water-reducer for ultra-fine sand pumping concrete specially used for aluminum molds. Each ton is made of the following kilograms of raw materials: polycarboxylate water-reducing mother liquor 150-250, polycarboxylate slump-preserving mother liquor 40-80, calcium lignosulfonate 30-100, sodium gluconate 0-30, Foaming agent 0.1-1, air-entraining agent 0.5-3, melamine 15-30, water 506-764.9. The calcium lignosulfonate-polycarboxylate composite water-reducer after compounding and modification of the present invention can not only reduce the water-reducing rate of the original polycarboxylate water-reducer without reducing the water-reducing rate of the polycarboxylate water-reducer Low production cost, faster dispersion, lower viscosity and good slump protection effect, as well as ensuring the strength and surface finish of concrete, are of great significance for the utilization of ultrafine sand resources and alleviating the situation of resource scarcity.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a novel calcium lignosulfonate calcium lignosulfonate modified polycarboxylate superfine sand pumping concrete water reducer for aluminum alloy templates. Background technique [0002] With the rapid development of today's social economy and modern infrastructure construction, the wide-scale use of sand in building pouring makes natural sand resources increasingly scarce, and the performance of corresponding sand is gradually deteriorating. In recent years, due to the unlimited abuse of natural sand resources Due to mining, the natural sand resources in a considerable part of the area are gradually exhausted, and even some places have reached the status of no sand available. At the same time, my country is rich in ultra-fine sand (fineness modulus M x <0.7) resources, the river sand in the middle and lower reaches of the Yangtze River, the Yellow River, the Pearl River and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/24C04B28/04C04B103/30
CPCC04B28/04C04B40/0039C04B2103/302C04B2111/00146C04B2201/20C04B24/24C04B24/18C04B24/10C04B2103/50C04B2103/304C04B24/128C04B22/002C04B18/141C04B18/08C04B14/068C04B14/02
Inventor 成燕向文锦柯贤孝王焕强吴明陈一鸣何玉洪范祖光李霞伍佳刘清名
Owner 中国水利水电第七工程局有限公司
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