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A kind of anti-crack expansion agent for concrete and preparation method thereof

The technology of expansion agent and concrete is applied in the field of concrete anti-cracking expansion agent and its preparation. , the effect of high expansion rate

Active Publication Date: 2020-09-15
日照海联诺新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Expansion agents have been widely used as compensation for shrinkage, but there are still deficiencies in the composite expansion agents on the market: ①The expansion rate is low; ②The compensation for shrinkage is not enough, and it cannot adapt to the strength development of concrete

Method used

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  • A kind of anti-crack expansion agent for concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] An anti-crack expansion agent for concrete, which is prepared from the following raw materials in parts by weight: 25 parts of phosphorus slag powder, 13 parts of nickel slag powder, 25 parts of modified phosphogypsum, 18 parts of powdery naphthalene-based water reducer, swelling leech 7 parts of stone powder, 4 parts of sodium hexametaphosphate, 8 parts of hydroxypropyl methylcellulose, 7 parts of starch compound.

[0042] The modified phosphogypsum is made of phosphogypsum under an inert gas atmosphere, calcined at 600°C for 3 hours, naturally cooled to 40°C, mixed evenly with a modifier, added water to a water content of 25%, reacted for 14 hours, and dried to obtain Modified phosphogypsum.

[0043] Said, the weight ratio of phosphogypsum and modifier is 100:4.

[0044] As stated, the modifier is prepared from aluminum sulfate, calcined alunite and sodium metasilicate in a weight ratio of 1:0.8:0.4.

[0045] Described, starch compound is prepared by following steps...

Embodiment 2

[0057] An anti-crack expansion agent for concrete, which is prepared from the following raw materials in parts by weight: 20 parts of phosphorus slag powder, 15 parts of nickel slag powder, 30 parts of modified phosphogypsum, 15 parts of powdery naphthalene-based water reducer, swelling leech 5 parts of stone powder, 5 parts of sodium hexametaphosphate, 10 parts of hydroxypropyl methylcellulose, 5 parts of starch compound.

[0058] The modified phosphogypsum is made of phosphogypsum under an inert gas atmosphere, calcined at 600°C for 2 hours, naturally cooled to 50°C, mixed evenly with a modifier, added water to a water content of 20%, reacted for 16 hours, and dried to obtain Modified phosphogypsum.

[0059] Said, the weight ratio of phosphogypsum and modifier is 100:3.

[0060] All the other are with embodiment 1.

Embodiment 3

[0062] An anti-crack expansion agent for concrete, which is prepared from the following raw materials in parts by weight: 30 parts of phosphorus slag powder, 10 parts of nickel slag powder, 20 parts of modified phosphogypsum, 20 parts of powdery naphthalene-based water reducer, swelling leech 9 parts of stone powder, 3 parts of sodium hexametaphosphate, 5 parts of hydroxypropyl methylcellulose, 10 parts of starch compound.

[0063] The modified phosphogypsum is made of phosphogypsum under an inert gas atmosphere, calcined at 600°C for 3 hours, naturally cooled to 30°C, mixed evenly with a modifier, added water to a water content of 30%, reacted for 12 hours, and dried to obtain Modified phosphogypsum.

[0064] Said, the weight ratio of phosphogypsum and modifier is 100:5.

[0065] All the other are with embodiment 1.

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Abstract

The invention discloses a concrete anti-cracking expanding agent and a preparation method thereof. The concrete anti-cracking expanding agent is prepared from the following raw materials in parts by weight: 20 to 30 parts of mineral dreg powder, 10 to 15 parts of nickel dreg powder, 20 to 30 parts of modified phosphogypsum, 15 to 20 parts of powdery naphthalene water reducer, 5 to 9 parts of expanded vermiculite powder, 3 to 5 parts of sodium hexametaphosphate, 5 to 10 parts of hydroxypropyl methyl cellulose, and 5 to 10 parts of starch compound. The concrete anti-cracking expanding agent disclosed by the invention has the advantages of high expanding rate, good shrinkage compensation effect, adaptation to the strength of concrete, high adaptability, applicability to coagulation of different strength grades, high-efficiency water reduction and certain reinforcing effect. After the concrete anti-cracking expanding agent is doped in the concrete, the compactness, the anti-permeability performance, the scouring resistance and wear resistance of the concrete can be significantly improved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a concrete anti-crack expansion agent and a preparation method thereof. Background technique [0002] Concrete admixtures, referred to as admixtures for short, refer to substances that are added to improve the performance of concrete before or during the mixing of concrete. Because admixtures can effectively improve the performance of concrete and have good economic benefits, they have been widely used in many countries, and their application in engineering has attracted more and more attention, becoming an indispensable material in concrete. The expansion agent is one of the concrete admixtures. [0003] In the initial stage of setting and during the hydration process of concrete, chemical reactions will occur to form crystalline compounds. Since the volume of crystalline compounds is smaller than that of raw materials, the volume of concrete will shrink...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B20/04C04B20/02C08B31/00C08B30/12
CPCC04B20/04C04B40/0039C08B30/12C08B31/00C04B18/145C04B18/144C04B22/144C04B2103/302C04B14/204C04B22/16C04B24/383C04B24/38C04B20/023
Inventor 肖维录
Owner 日照海联诺新材料有限公司
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