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Self-compacting concrete and preparation method thereof

A self-compacting concrete and gravel technology, applied in the field of concrete, can solve the problems of concrete cracks, affecting the strength of dense concrete, and prone to fracture, etc., and achieve the effect of reducing cracks, reducing concrete cracking, and increasing pumping performance

Active Publication Date: 2020-11-24
山东华爵混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the construction process, a large amount of calcium hydroxide will be generated after the cement hydration reaction occurs. Carbon dioxide in the air will penetrate into the concrete and combine with the calcium hydroxide produced during the hydration process to form calcium carbonate. The texture of calcium carbonate is brittle and prone to fracture. As a result, cracks appear on the concrete and affect the strength of self-compacting concrete

Method used

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  • Self-compacting concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] S1. Weigh 760kg of crushed stone, 820kg of sand and 300kg of P.Ⅱ42.5 cement into the mixer, stir for 15min at a speed of 60r / min, to prepare a primary mixture;

[0040] S2. Weigh 50kg of fly ash, 60kg of slag powder, 15kg of silica fume, 9kg of sodium polyacrylate, 20kg of sodium laurate and add it to the primary mixture in S1, stir at a speed of 60r / min for 20min to prepare a secondary mixture ;

[0041] S3. Add 6kg of SPR-1 pumping agent and 160kg of drinking water into the secondary mixture in S2, and stir at a speed of 60r / min for 30min to prepare self-compacting concrete.

Embodiment 2

[0043] S1. Weigh 830kg of crushed stone, 910kg of sand and 300kg of P.Ⅱ42.5 cement into the mixer and stir for 15min at a speed of 60r / min to prepare a primary mixture;

[0044] S2. Weigh 50kg fly ash, 60kg slag powder, 15kg silica fume, 9kg sodium polyacrylate, 20kg sodium laurate into the primary mixture in S1, stir at 60r / min for 20min to prepare the secondary mixture ;

[0045] S3. Add 9kg of SPR-1 pumping agent and 180kg of drinking water into the secondary mixture in S2, and stir at a speed of 60r / min for 30min to prepare self-compacting concrete.

Embodiment 3

[0047] S1. Weigh 830kg of crushed stone, 910kg of sand and 300kg of P.Ⅱ42.5 cement into the mixer and stir for 15min at a speed of 60r / min to prepare a primary mixture;

[0048] S2. Weigh 55kg fly ash, 65kg slag powder, 30kg silica fume, 9kg sodium polyacrylate, 30kg sodium laurate into the primary mixture in S1, stir at 60r / min for 20min to prepare the secondary mixture ;

[0049] S3. Add 9kg of SPR-1 pumping agent and 180kg of drinking water into the secondary mixture in S2, and stir at a speed of 60r / min for 30min to prepare self-compacting concrete.

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Abstract

The invention relates to the field of concrete, and particularly discloses self-compacting concrete and a preparation method thereof. The self-compacting concrete comprises the following raw materialsin parts by weight: 760-900 parts of broken stone, 820-1000 parts of sand, 00-420 parts of cement, 115-205 parts of an admixture, 6-12 parts of a pumping agent, 29-45 parts of a protective agent and160-200 parts of drinking water, wherein the admixture comprises one or more of fly ash, superfine slag powder and silica fume, and the protective agent is composed of sodium polyacrylate and sodium laurate in a weight ratio of (9-15): (20-30). The preparation method of the self-compacting concrete comprises the steps as follows: weighing the broken stone, the sand and the cement into a mixer, stirring the materials evenly, weighing and adding the admixture and the protective agent to the mixer, adding the pumping agent and water after mixing evenly, and carrying out uniform mixing and discharging. The self-compacting concrete has the advantages of reducing calcium carbonate production and reducing concrete cracking.

Description

Technical field [0001] The invention relates to the field of concrete, more specifically, it relates to a self-compacting concrete and a preparation method thereof. Background technique [0002] Self-compacting concrete refers to concrete that has high fluidity, good cohesion, uniformity and stability, and depends on its own weight during pouring to achieve compactness without vibrating. Because self-compacting concrete does not need to be vibrated, it can be poured into a structure with complex shapes, thin walls and dense reinforcement, which increases the freedom of structural design and has good construction performance. With the rapid development of modern concrete construction projects in my country, Dense concrete has attracted wide attention in our country, and its popularization and application are increasing rapidly. [0003] The Chinese invention patent application with publication number CN109503043A discloses a C40 self-compacting concrete formula and its preparation m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/08C04B18/08C04B18/14C04B24/08C04B24/26B28C5/00
CPCC04B28/04C04B28/08C04B24/085C04B24/2641C04B18/08C04B18/141C04B18/146B28C5/006C04B18/12C04B14/06C04B2103/0068C04B22/002Y02W30/91
Inventor 刘均平安华雨袁法周赵靖
Owner 山东华爵混凝土有限公司