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Self-compacting concrete and preparation method thereof

A kind of self-compacting concrete and concrete technology, applied in the field of concrete, can solve the problems of unfavorable durability of concrete structure, relatively high requirements for raw material selection, increase of project cost, etc., and achieve the goal of improving appearance quality, easily obtaining local materials, and improving crack resistance Effect

Inactive Publication Date: 2018-12-28
宜昌鑫大兴混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, self-compacting concrete also has the following disadvantages: First: due to the characteristics of self-compacting concrete, such as high powder dosage and low aggregate dosage, and a large number of air bubbles will be generated during the production and pouring process, which makes it inferior to ordinary concrete. The dry shrinkage is too large, which is unfavorable to the durability of the concrete structure; second: the current "Technical Regulations for the Application of Self-Compacting Concrete" (JGJ / T 283-2012) stipulates that the content of needle-like particles in self-compacting concrete The research and test of dense concrete is based on the fact that the amount of mineral admixture in the design of concrete mix ratio exceeds the total amount of cementitious material by 40%, and the design is carried out with the age of 60 days of concrete, which may not be applicable in actual production work; third: The requirements for the selection of raw materials are relatively high, which increases the project cost

Method used

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  • Self-compacting concrete and preparation method thereof
  • Self-compacting concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A self-compacting concrete comprising the following components in parts by weight:

[0031] 1 part of cement, 0.49 parts of water, 2.05 parts of sand, 2.6 parts of stone, 0.27 parts of fly ash, 0.10 parts of expansion agent, and 0.015 parts of admixture.

[0032] The preparation process is:

[0033] 1) Clean the raw material stones and stack them in a wet and no clear water condition. Cement and fly ash must be stored in the warehouse for no less than 3 days, so that the internal temperature is close to the external temperature;

[0034] 2) Put the admixture into the water and mix it for later use, put the sand and stone into the mixer and mix it for 20s, put the powder into the mixer and mix it with the sand and gravel for 20s; finally add the mixture of the admixture and water into the mixer and mix it for 120s, to obtain self-compacting concrete.

[0035] The resulting self-compacting concrete has poor fluidity, insufficient patina and slight bleeding.

Embodiment 2

[0037] A self-compacting concrete comprises the following components in parts by weight: 1 part of cement, 0.49 part of water, 2.11 parts of sand, 2.55 parts of stone, 0.27 part of fly ash, 0.10 part of expansion agent and 0.014 part of admixture.

[0038] The preparation process is:

[0039] 1) Clean the raw material stones and stack them in a wet and no clear water condition. Cement and fly ash must be stored in the warehouse for no less than 3 days, so that the internal temperature is close to the external temperature;

[0040] 2) Put the admixture into the water and mix it for later use, put the sand and stone into the mixer and mix it for 20s, put the powder into the mixer and mix it with the sand and gravel for 20s; finally add the mixture of the admixture and water into the mixer and mix it for 140s, to obtain self-compacting concrete.

[0041] Compared with Example 1, the obtained self-compacting concrete has appropriately increased the sand rate, reduced the amount o...

Embodiment 3

[0043] A self-compacting concrete comprises the following components in parts by weight: 1 part of cement, 0.49 part of water, 2.11 parts of sand, 2.55 parts of stone, 0.28 part of fly ash, 0.09 part of expansion agent and 0.013 part of admixture.

[0044] The preparation process is:

[0045] 1) Clean the raw material stones and stack them in a wet and no clear water condition. Cement and fly ash must be stored in the warehouse for no less than 3 days, so that the internal temperature is close to the external temperature;

[0046] 2) Put the admixture into the water and mix it for later use, put the sand and stone into the mixer and mix it for 20s, put the powder into the mixer and mix it with the sand and gravel for 20s; finally add the mixture of the admixture and water into the mixer and mix it for 130s, to obtain self-compacting concrete.

[0047] The obtained self-compacting concrete is compared with Example 2. Under the condition of constant water-binder ratio, the amou...

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Abstract

The invention discloses self-compacting concrete and a preparation method thereof. The self-compacting concrete is prepared from components in parts by weight as follows: 1 part of cement, 0.4-0.5 parts of water, 2.0-2.2 parts of sand, 2.45-2.6 parts of stone, 0.25-0.4 parts of fly ash, 0.08-0.11 parts of an expanding agent and 0.010-0.016 parts of an additive. During preparation, 1) raw materialstone is thoroughly cleaned and piled under the condition that the stone is wet and contains no open water, and powder is required to be stored in a storage for at least 3 days; 2) the additive is added to water to be mixed for later use, sand and stone are put in a stirrer to be stirred, and the powder is put in the stirrer to be mixed with the sand and stone; finally, a mixed liquid of the additive and the water is added to the stirrer to be mixed to obtain the self-compacting concrete. The concrete obtained by the formula has good fluidity, materials are easy to obtain locally, and the concrete has small shrinkage, has the 28 d compressive strength up to 49.4 Mpa or above, can completely meet C40 high-strength structure concrete and can be applied to concrete reinforcement, strengthening and rebar dense areas and structural construction difficult and even unable to pour in industrial, civil and municipal engineering.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a self-compacting concrete and a preparation method thereof. Background technique [0002] Self-compacting concrete (Self-Compacting Concrete, referred to as SCC), means that the mixture has high fluidity and does not segregate or bleed during the concrete pouring process, and can completely rely on self-weight leveling without vibration and fill the template and Concrete encased in rebar. Self-compacting concrete, using its own excellent construction performance, ensures that the concrete can be compacted even under unfavorable construction conditions, and avoids quality defects such as cavities, honeycombs, and pockmarks caused by insufficient vibration. It can not only improve the compactness of concrete to solve common quality problems, but also save vibrating equipment and energy, save working time, reduce noise, improve the working environment and ensure the progress and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B14/02C04B14/06C04B18/08C04B2103/0068C04B2103/302
Inventor 王国荣李辉华杜凯
Owner 宜昌鑫大兴混凝土有限公司
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