Crack-resistant mass concrete and preparation method thereof

A technology of mass concrete and crack resistance, applied in the field of mass concrete, can solve the problems of cumbersome operation process, achieve good fluidity, compensate for early shrinkage, and compensate for shrinkage

Inactive Publication Date: 2019-11-19
北京城建九秋实混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all use external technology to improve the cracking problem of mass concrete, which is relatively cumbersome in the actual operation process

Method used

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  • Crack-resistant mass concrete and preparation method thereof
  • Crack-resistant mass concrete and preparation method thereof
  • Crack-resistant mass concrete and preparation method thereof

Examples

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preparation example Construction

[0030] The invention provides a crack-resistant mass concrete and a preparation method thereof. The crack-resistant concrete is made of raw materials containing the following parts by weight:

[0031] 300-500 parts of cement, 150-260 parts of water, 80-120 parts of mineral powder, 120-180 parts of fly ash, 1300-1500 parts of crushed stone, 600-800 parts of sand, 30-50 parts of admixture, 80-140 parts 100-230 parts of ammonium salt, 100-230 parts of expansion agent, 50-100 parts of microsilica, 60-120 parts of diatomaceous earth and 100-150 parts of rose fiber. Ammonium salt includes one or both of ammonium nitrate and ammonium chloride. The expansion agent includes 50-100 parts of calcium sulfoaluminate, 20-80 parts of magnesium oxide, and 30-50 parts of calcium oxide.

[0032] The preparation method is as follows: first put in crushed stone, then put in rose fiber soaked in water for 10 minutes, then put in sand and diatomaceous earth and stir for 5-10 minutes, then put in ce...

Embodiment 1

[0043] A preparation method for crack-resistant mass concrete, comprising the following steps:

[0044] First put in 1400kg of gravel, then put in 120kg of rose fiber, then put in 700kg of sand and 90kg of diatomaceous earth and stir for 8 minutes, then put in 400kg of cement, 150kg of fly ash, 100kg of mineral powder, 70kg of silica fume and 170kg of expansion agent, and stir for 12 minutes , then dissolve 40kg of admixture in 200kg of water and add, after stirring for 5 minutes, add 100kg of ammonium salt, and stir for 25 minutes to obtain;

[0045] Among them, the ammonium salt includes ammonium chloride and ammonium nitrate with a mass ratio of 1:3, the expansion agent includes 80kg of calcium sulfoaluminate, 50kg of magnesium oxide, and 40kg of calcium oxide, and the rose fiber is soaked in water for 10 minutes before being added.

[0046] Table 1:

[0047]

[0048]

[0049] Continuation of Table 1:

[0050]

Embodiment 2-18

[0052] A method for preparing crack-resistant mass concrete is carried out according to the method in Example 1, except that the raw materials are added according to the ratio of raw materials in Table 1.

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Abstract

The invention discloses crack-resistant mass concrete and a preparation method thereof, wherein the crack-resistant mass concrete is prepared from the following raw materials by weight: 300-500 partsof cement, 150-260 parts of water, 80-120 parts of mineral powder, 120-180 parts of fly ash, 1300-1500 parts of crushed stone, 600-800 parts of sand, 30-50 parts of an admixture, 80-140 parts of an ammonium salt, 100-230 parts of an expansion agent, 60-120 parts of diatomite, and 100-150 parts of Roycele fiber, wherein the ammonium salt comprises one or two selected from ammonium nitrate and ammonium chloride. The preparation method comprises: pouring crushed stone, pouring Roycele fiber, pouring sand and diatomite, stirring for 5-10 min, pouring cement, fly ash, mineral powder and an expansion agent, stirring for 10-15 min, dissolving an admixture in water, adding the dissolved admixture, stirring for 5 min, adding an ammonium salt, and stirring for 20-30 min to obtain the product. According to the present invention, the prepared concrete has advantages of low hydration heat, high strength and excellent crack resistance.

Description

technical field [0001] The invention relates to the technical field of mass concrete, more specifically, it relates to a crack-resistant mass concrete and a preparation method thereof. Background technique [0002] my country's "Code for Construction of Mass Concrete" GB50496-2009 stipulates that the minimum geometric size of the concrete structure is not less than 1m, or it is expected to cause harmful cracks due to temperature changes and shrinkage caused by the hydration of the cementitious material in the concrete. The resulting concrete is called mass concrete. [0003] Large-volume concrete construction is commonly used in modern buildings, such as the foundation of high-rise buildings, large-scale equipment foundations, water conservancy dams, etc. Due to its large size, the release of cement hydration heat is relatively concentrated, and the internal temperature rises relatively quickly. When the temperature difference between the inside and outside of the concrete i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08C04B111/20
CPCC04B28/08C04B2111/20C04B2201/50C04B2201/52C04B18/141C04B18/08C04B14/02C04B14/06C04B22/085C04B22/124C04B22/142C04B22/066C04B22/064C04B18/146C04B14/08C04B20/0048
Inventor 卫晓勇王鑫刘杰陈志鹏
Owner 北京城建九秋实混凝土有限公司
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