Expansion agent for concrete as well as preparation and use methods of expansion agent
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An expansion agent, concrete technology, applied in the field of concrete expansion agent, can solve unsatisfactory problems
Active Publication Date: 2021-07-16
ZHENGZHOU SINO SINA BUILDING MATERIALS CO LTD
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Although it can obtain a certain strength and the ability to compensate for shrinkage, it is still unsatisfactory
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preparation example 1
[0033] The preparation of preparation example 1 modified calcium oxide
[0034] Composition of raw materials (parts by weight): 50 parts of calcium oxide, 4 parts of citric acid, 10 parts of bentonite, and 50 parts of ethanol.
[0037] S2. Filter the mixture in step S1, wash, and dry at 100° C. for 20 minutes;
[0038] S3. Calcining the dried product obtained in step S2 at 500° C. for 1 hour, and then pulverizing it to 200 mesh to obtain modified calcium oxide.
preparation example 2
[0039] Preparation of Preparation Example 2 Modified CalciumOxide
[0040] Composition of raw materials (parts by weight): 40 parts of calcium oxide, 3 parts of citric acid, 7 parts of bentonite, and 40 parts of ethanol.
[0041] Methods as below:
[0042] S1. Dry calcium oxide at 90°C, then add citric acid, bentonite and ethanol in proportion, and ball mill and mix for 3 hours;
[0043] S2. Filter the mixture in step S1, wash, and dry at 90° C. for 15 minutes;
[0044] S3. After calcining the dried product obtained in step S2 at 450° C. for 1 hour, it was crushed to 150 mesh to obtain modified calcium oxide.
preparation example 3
[0059] Preparation of Preparation Example 3 Modified MagnesiumOxide
[0060] Composition of raw materials (parts by weight): 30 parts of magnesium oxide, 2 parts of citric acid, 5 parts of bentonite, and 30 parts of ethanol.
[0061] Methods as below:
[0062] S1. Dry the magnesium oxide at 80°C, then add citric acid, bentonite and ethanol in proportion, and ball mill and mix for 2 hours;
[0063] S2. Filter the mixture in step S1, wash, and dry at 80° C. for 10 minutes;
[0064] S3. After calcining the dried product obtained in step S2 at 400° C. for 0.5 h, it was crushed to 100 mesh to obtain modified magnesium oxide.
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Abstract
The invention provides an expansion agent for concrete. The expansion agent is composed of a core material and a shell material, wherein the core material is prepared from modified metaloxide, sodiumligninsulfonate and sodium tripolyphosphate; the shell material is prepared from calcium alginate; and the modified metaloxide is prepared from metaloxide, citric acid, bentonite and low-carbon alcohol. The hydration speed of the expansion agent is synchronous with the forming speed of a cement paste structure under the same curing condition, and hydration is started when the cement paste structure is formed; when the cement paste has low gelling strength, the reaction rate of an expanding material reaches the maximum; after the cement paste is hardened, the reaction rate of the expanding material is gradually slowed down; and therefore, sufficient plastic expansion and certain later expansion can be generated, and double-expansion effect is achieved.
Description
technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a concrete expansion agent and a preparation and use method thereof. Background technique [0002] Concrete is the most widely used building material. With the development of science and technology, it is constantly being studied in depth, and its performance is improved and developed. In recent years, the shrinkage and cracking of concrete has become a research hotspot. This is because in the early stage of cement setting and hardening, water loss and changes in temperature and humidity are likely to cause volume shrinkage, and the tensile stress generated when the shrinkage is limited exceeds the concrete itself. When the tensile strength is high, cement concrete is prone to cracking; at the same time, the bearing capacity of the cracked concrete decreases sharply; moreover, the infiltration of water will further deteriorate the durability of concrete, resulting in ...
Claims
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