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Self-compacting freeze-thaw resistant concrete and preparation method thereof

A freeze-thaw resistance, concrete technology, applied in the field of concrete, can solve the problems of cracks and fine lines in concrete, poor freeze-thaw effect, etc., to prevent segregation and bleeding problems, improve freeze-thaw resistance performance, improve slurry - Effect of solid ratio

Inactive Publication Date: 2021-03-05
青岛崇置混凝土工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the existing self-compacting concrete reduces the amount of cement and cementitious materials, comprehensively utilizes waste, reduces the processing cost of concrete, and the added aliphatic hydroxysulfonate high-efficiency water reducer increases the antifreeze performance of concrete , but the aliphatic hydroxysulfonate high-efficiency superplasticizer can only be used as an antifreeze agent at a fixed temperature of -5°C. When the concrete prepared in this case is in an environment lower than -5°C, the antifreeze-thaw effect is not good, making Concrete is prone to cracks and fine lines

Method used

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  • Self-compacting freeze-thaw resistant concrete and preparation method thereof
  • Self-compacting freeze-thaw resistant concrete and preparation method thereof
  • Self-compacting freeze-thaw resistant concrete and preparation method thereof

Examples

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Effect test

preparation example 1

[0045] Preparation Example 1: (1) According to the proportioning in Table 1, 50 kilograms of water, 10 kilograms of polyvinyl alcohol, 5 kilograms of sodium formate, 5 kilograms of potassium thiocyanate, and 5 kilograms of sodium thiosulfate were added to the reactor successively, and the The temperature of the reactor was controlled at 95°C, and stirred for 60 minutes; (2) the temperature was lowered to 60°C, and 10 kg of ethylene glycol, 5 kg of potassium acetate and 10 kg of sodium nitrate were added in sequence, and stirred for 100 minutes;

[0046] (3) Finally, add 20 kg of rubber powder, 5 kg of steel fiber and 5 kg of brucite fiber in turn, and stir for 40 minutes, wherein the particle size of the rubber powder is 0.25 mm, and the apparent density is 1300 kg / m 3 , bulk density is 650kg / m 3 , the steel fibers are milled steel fibers with a length of 30 mm and a diameter of 1.25 mm, and brucite fibers with a diameter of 0.54 μm and a length of 35 mm.

[0047] The raw mat...

preparation example 2

[0049] Preparation Example 2: (1) According to the proportioning in Table 1, 65 kilograms of water, 13 kilograms of polyvinyl alcohol, 8 kilograms of sodium formate, 8 kilograms of potassium thiocyanate, and 8 kilograms of sodium thiosulfate were added to the reactor successively. The temperature of the reactor was controlled at 98°C and stirred for 70 minutes;

[0050] (2) Lower the temperature to 63°C, add 13 kg of ethylene glycol, 7 kg of potassium acetate and 13 kg of sodium nitrate in sequence, and stir for 110 min;

[0051] (3) Finally, add 25 kg of rubber powder, 8 kg of steel fiber and 8 kg of brucite fiber in turn, and stir for 50 minutes, wherein the rubber powder has a particle size of 0.3 mm and an apparent density of 1350 kg / m 3 , bulk density is 660kg / m 3 , the steel fibers are milled steel fibers with a length of 35 mm and a diameter of 1.35 mm, and brucite fibers with a diameter of 0.64 μm and a length of 40 mm.

preparation example 3

[0052] Preparation Example 3: (1) According to the proportioning in Table 1, 80 kilograms of water, 15 kilograms of polyvinyl alcohol, 10 kilograms of sodium formate, 10 kilograms of potassium thiocyanate, and 10 kilograms of sodium thiosulfate were added to the reactor successively, and the The temperature of the reactor was controlled at 100°C and stirred for 80 minutes;

[0053] (2) Lower the temperature to 65°C, add 15 kg of ethylene glycol, 10 kg of potassium acetate and 15 kg of sodium nitrate in sequence, and stir for 120 minutes;

[0054] (3) Finally, add 30 kg of rubber powder, 10 kg of steel fiber and 10 kg of brucite fiber in sequence, and stir for 60 minutes, wherein the particle size of the rubber powder is 0.35 mm, and the apparent density is 1400 kg / m 3 , bulk density is 680kg / m 3 , the steel fibers are milled steel fibers with a length of 40 mm and a diameter of 1.45 mm, and brucite fibers with a diameter of 0.74 μm and a length of 45 mm.

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Abstract

The invention discloses a self-compacting anti-freezing and anti-thawing concrete and a preparation method thereof. The self-compacting anti-freezing and anti-thawing concrete is composed of, by weight part, 290-360 parts of cement, 15.5-25.5 parts of additives, 130-180 parts of mineral admixture, 250-320 parts of fine aggregate, 500-700 parts of coarse aggregate, 80-120 parts of coal ash, 180-240parts of water, 8.6-12.8 parts of water reducer, 10-15 parts of adhesives and 10-20 parts of lignin fiber, wherein the additives are composed of anti-freezing agent, air entraining agent and swellingagent at a weight ratio of 1:2-3:0.7-1. The preparation method of the self-compacting anti-freezing and anti-thawing concrete comprises preparing a first mixture, preparing a second mixture and preparing a finished product. The self-compacting anti-freezing and anti-thawing concrete has the advantages of being good in peaceability, less prone to bleeding and segregation and high in anti-freezingand anti-thawing performance.

Description

technical field [0001] The invention relates to the technical field of concrete, more specifically, it relates to a self-compacting freeze-thaw resistant concrete and a preparation method thereof. Background technique [0002] Concrete is an indispensable and important engineering material in modern civil engineering. And self-compacting concrete is a kind of high-performance concrete. Its mixture has high fluidity without segregation and bleeding, and can level itself without vibration, and is filled with models and wrapped steel bars; its slump The time loss is small. Due to the low cement consumption of self-compacting concrete, the high utilization rate of waste slag and good construction performance, it can save waste, manpower and material resources, speed up the construction progress, reduce the overall cost of concrete, and solve the problem of disturbing people when pouring concrete, especially for difficult-to-use concrete. Pouring, even parts that cannot be pour...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B24/26C04B111/20C04B103/60
CPCC04B28/04C04B40/0039C04B2103/601C04B2111/29C04B24/2623C04B14/48C04B14/38C04B24/02C04B24/04C04B22/085C04B22/14C04B2103/0045C04B18/141C04B18/146C04B14/28C04B18/08C04B14/02C04B14/06C04B18/26C04B24/16C04B22/066C04B24/36C04B24/283C04B24/281C04B24/226C04B14/26C04B14/048
Inventor 王德邓国威
Owner 青岛崇置混凝土工程有限公司
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