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A preparation method of concrete with shrinkage compensation function and self-curing function

A technology for compensating shrinkage and concrete, which is applied in the field of new building materials, can solve problems such as contradiction and difficulty in popularization, and achieve the effects of compensating for water loss, reducing internal stress, and reducing the risk of shrinkage cracks

Active Publication Date: 2018-04-10
XUZHOU ZHONGLIAN CONCRETE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, magnesium oxide-based expansion agents can make up for the above defects, but it has been difficult to promote their use because they are contrary to the standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: A preparation method of concrete with shrinkage compensation function and self-curing function.

[0014] A preparation method of concrete with shrinkage compensation function and self-curing function. Soak the pottery sand in a sodium acetate aqueous solution with a concentration of 1M (molar concentration), and spray glue on the pottery sand after the pottery sand fully absorbs the sodium acetate solution The cotton liquid forms a layer of semi-permeable membrane on the outer surface of the clay sand, and then coats a layer of cement slurry with a water-cement ratio of 0.3 on the outer surface of the clay sand after the film is formed. The pottery sand is shale pottery sand, and the maximum particle size of the shale pottery sand is less than or equal to 2 mm.

[0015] The collodion solution is prepared by dissolving cellulose nitrate in a mixture composed of ether and ethanol. The mass ratio between the ether and ethanol is 1:1. The mass percent concen...

Embodiment 2

[0016] Embodiment 2: A preparation method of concrete with shrinkage compensation function and self-curing function.

[0017] A preparation method of concrete with shrinkage compensation function and self-curing function, immersing pottery sand in an aqueous solution of a mixture of sodium acetate and potassium acetate with a concentration of 1.5M (molar concentration), between sodium acetate and potassium acetate The mass ratio is 1:2. After the pottery sand fully absorbs the sodium acetate solution, spray the collodion solution on the pottery sand to form a layer of semi-permeable film on the outer surface of the pottery sand, and then coat a layer of water ash on the outer surface of the pottery sand after the film is formed. Cement slurry with a ratio of 0.3. The pottery sand is shale pottery sand, and the maximum particle size of the shale pottery sand is less than or equal to 2 mm.

[0018] The collodion solution is prepared by dissolving cellulose nitrate in a mixture...

Embodiment 3

[0019] Embodiment 3: A preparation method of concrete with shrinkage compensation function and self-curing function.

[0020] A preparation method of concrete with shrinkage compensation function and self-curing function. The pottery sand is soaked in potassium acetate aqueous solution with a concentration of 2M (molar concentration), and after the pottery sand fully absorbs the sodium acetate solution, spray glue on the pottery sand The cotton liquid forms a layer of semi-permeable film on the outer surface of the clay sand, and then coats a layer of cement paste with a water-cement ratio of 0.4 on the outer surface of the clay sand after the film is formed. The pottery sand is shale pottery sand, and the maximum particle size of the shale pottery sand is less than or equal to 2 mm.

[0021] The collodion solution is prepared by dissolving cellulose nitrate in a mixture composed of ether and ethanol. The mass ratio between the ether and ethanol is 1:1.2. The mass percent co...

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Abstract

The invention provides a preparation method for concrete with a shrinkage-compensating function and a self-maintenance function. The preparation method comprises the following steps: soaking pottery sand in an aqueous solution of sodium acetate or / and potassium acetate with a concentration of 1 to 3 M; then spraying collodion liquid into the pottery sand so as to form a semi-permeable membrane on the external surface of the pottery sand; and coating the external surface of the pottery sand with cement paste. According to the invention, in virtue of the osmotic pressure of the semi-permeable membrane, continuous expansion occurs in the concrete to compensate for various shrinkages of the concrete after hardening, thereby reducing inner stress of the concrete; moreover, in a dry season with low external humidity, water enclosed in the semi-permeable membrane can compensate for water desorption of the concrete, thereby reducing the risk of cracks of the concrete caused by air shrinkage.

Description

technical field [0001] The invention relates to a preparation method of concrete with shrinkage compensation function and self-curing function, belonging to the technical field of new building materials. Background technique [0002] There are various forms of shrinkage in modern concrete, resulting in internal stresses that lead to poor volume stability. The current existing method is to compensate the shrinkage of concrete through some expansion agents (mainly sulphoaluminate and calcium oxide series). The expansion period of these expansive agents is relatively short, and they only play a role in compensating for shrinkage within one week after the concrete hardens, after which the expansive agents themselves are constantly shrinking. In recent years, magnesium oxide-based expansion agents can make up for the above defects, but it has been difficult to promote their use because they are contrary to the standards. Contents of the invention [0003] The purpose of the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B18/02C04B20/02C04B20/10
CPCC04B20/023C04B20/1048C04B28/00C04B18/023
Inventor 李强王洪梅马涛蒋临生孙琳祖庆贺臧军
Owner XUZHOU ZHONGLIAN CONCRETE CO LTD
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