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A kind of machine-made sand low shrinkage high slump-preserving concrete

A machine-made sand and low-shrinkage technology, which is applied in the field of concrete production, can solve the problems of irregular surface of machine-made sand, reduce concrete strength, affect mortar fluidity, etc., and achieve the effect of improving crack resistance, improving flow performance and good construction performance

Active Publication Date: 2022-08-05
天津金隅混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the irregular surface of the machine-made sand and the large amount of stone powder contained in the machine-made sand, the surface area of ​​the aggregate increases, requiring more cement paste for wrapping, which increases production costs. In addition, excessive stone powder content is prone to viscous effects and affects The fluidity of the mortar will eventually reduce the strength of the concrete

Method used

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  • A kind of machine-made sand low shrinkage high slump-preserving concrete
  • A kind of machine-made sand low shrinkage high slump-preserving concrete
  • A kind of machine-made sand low shrinkage high slump-preserving concrete

Examples

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Effect test

preparation example 1

[0045] A preparation method of pretreated machine-made sand, comprising the following steps:

[0046] (1) Silica gel powder pretreatment: 80kg of silica gel powder was placed in a container, and 35kg of water-based epoxy resin and 30kg of vinyl acetate-ethylene copolymer emulsion were added and stirred and mixed for 3h;

[0047](2) Add 840 kg of manufactured sand, 7 kg of water reducing agent, and 80 kg of water to the silica gel powder obtained in step (1) and stir and mix for 2 hours to obtain pretreated manufactured sand.

preparation example 2

[0049] A preparation method of pretreated machine-made sand, comprising the following steps:

[0050] (1) Silica gel powder pretreatment: 90kg of silica gel powder was placed in a container, and 30kg of water-based epoxy resin and 45kg of vinyl acetate-ethylene copolymer emulsion were added and stirred and mixed for 3h;

[0051] (2) Add 840 kg of manufactured sand, 7 kg of water reducing agent, and 80 kg of water to the silica gel powder obtained in step (1) and stir and mix for 2 hours to obtain pretreated manufactured sand.

preparation example 3

[0053] A preparation method of pretreated machine-made sand, comprising the following steps:

[0054] (1) Silica gel powder pretreatment: put 80kg of silica gel powder in a container, and add 35kg of water-based epoxy resin, 30kg of vinyl acetate-ethylene copolymer emulsion, 18kg of carbon nanotubes, and 25kg of silane coupling agent, stirring and mixing for 3h;

[0055] (2) Add 840 kg of manufactured sand, 7 kg of water reducing agent, and 80 kg of water to the silica gel powder obtained in step (1) and stir and mix for 2 hours to obtain pretreated manufactured sand.

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Abstract

The application discloses a low-shrinkage and high-slump-preserving concrete made of machine-made sand, which belongs to the technical field of concrete. , 100-120 parts of fly ash, 800-850 parts of machine-made sand, 900-1050 parts of stone, 150-200 parts of water, 7-8 parts of water reducing agent, 20-40 parts of carboxylated styrene-butadiene latex, 10 parts of calcium sulfate whiskers ‑20 parts, 30-45 parts of polyacrylate emulsion, 0.9-1.1 parts of air-entraining agent, and 2-5 parts of sodium tripolyphosphate, to achieve the effect of improving the strength of machine-made sand concrete.

Description

technical field [0001] The present application relates to the technical field of concrete production, in particular to a low-shrinkage and high-slump-preserving concrete made of machine-made sand. Background technique [0002] With the continuous development of urban construction, natural river sand is gradually in short supply, resulting in a rapid increase in the price of high-quality natural river sand and unstable supply. Therefore, machine-made sand is used as a substitute for natural river sand and gradually applied to concrete. [0003] At present, the common machine-made sand particles on the market are sharp, multi-angled, rough in surface and irregular in shape. Although this kind of machine-made sand can improve the interlocking and locking effect between machine-made sand particles to a certain extent, the rough surface of machine-made sand can enhance its The bonding effect with the cementitious material improves the hardening performance of the concrete, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B22/16C04B24/26C04B14/06
CPCC04B28/04C04B24/2641C04B24/2676C04B22/16C04B14/06C04B2201/50C04B18/12C04B18/08C04B14/02C04B2103/302C04B14/383C04B2103/304
Inventor 宁鹏高瀛洲张忍张晶晶张广宇谷晓光陈军亮刘磊
Owner 天津金隅混凝土有限公司