A special admixture for self-compacting concrete for pouring in closed spaces

A self-compacting concrete and closed space technology, applied in the field of high-performance concrete, can solve the problems of self-compacting concrete viscosity, long-term slump retention, strong sensitivity, etc. Effect

Active Publication Date: 2019-06-07
SHANGHAI CONSTR BUILDING MATERIALS TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The admixture of the present invention mainly solves the self-compacting concrete’s ultra-long-term slump retention, self-compacting concrete viscosity problems, easy bleeding, strong sensitivity and other problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take the corresponding raw materials introduced in the present invention to compound the water reducer. The solid components are added using the liquid pre-dissolution mode. Its specific composition ratio is as follows (the ratio is calculated as mass percentage):

[0041] components

[0042] The polycarboxylate water reducer in the embodiment is a polyether polycarboxylate high performance water reducer, its solid content is between 40% and 50%, and under the specified dosage, its clean pulp fluidity is greater than 200mm, and its pH value is for 6-7. The polycarboxylate slump retaining agent is a selective adsorption polycarboxylate for ultra-long-term slump retaining, and has a water-reducing and slump-retaining two-component structure. The viscosity regulator is a polyether polymer viscosity regulator. The bleeding inhibitors include cellulose ethers and propylene bleeding inhibitors. Described retarder is sodium gluconate. The defoamer is silicone, e...

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PUM

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Abstract

The invention relates to a special additive for self-compacting concretes for concrete pouring in closed space. The special additive can be used for preparation of various self-compacting concretes and is applicable to preparation of high-flowability concretes, pouring in closed space and various special-structured buildings. The special additive is prepared from, by mass percent, 5-10 of a polycarboxylate superplasticizer, 30-50 of polycarboxylic acid, 10-20 of a viscosity modifier, 1-3 of weepage inhibitor, 0.1-0.3 of an antifoaming agent, 1-3 of a retarder and 17-47 of water. The special additive for the self-compacting concretes for concrete pouring in the closed space has advantages that concrete workability can be improved remarkably, concrete slump retaining time is prolonged, weepage and laitance layers are avoided after concrete pouring, and construction requirements of the self-compacting concretes are met.

Description

technical field [0001] The invention relates to a kind of concrete preparation, which is suitable for pouring of closed space structures or other self-compacting concrete filling layers, and other high-performance concretes. Background technique [0002] With the advancement of urbanization in recent years, the amount of concrete used in cities has risen sharply. The difficulty of engineering also increases gradually. Due to the complexity and diversity of modern architectural structures. New requirements have also been put forward for concrete pouring works. Concrete structures with many confined spaces appeared. Therefore, high-performance concrete has become the main direction of the development of concrete technology today. As an important component of high performance concrete. The development of high-performance admixture technology has become an important technical means to reflect the performance of self-compacting concrete. [0003] Self-compacting concrete is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B103/22C04B103/30C04B103/46C04B111/70
CPCC04B40/0039C04B2103/22C04B2103/308C04B2103/465C04B2111/70C04B24/24C04B24/32C04B24/383C04B24/00C04B24/10C04B2103/50C04B22/02
Inventor 李晓庭冯波吴德龙孙丽华吴文泉金自清
Owner SHANGHAI CONSTR BUILDING MATERIALS TECH GRP CO LTD
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