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Mass concrete and preparation method thereof

A technology of mass concrete and Portland cement, which is applied in the field of construction, can solve problems such as the reduction of concrete structure strength, and achieve the effects of inhibiting alkali-aggregate reaction, reducing costs, and reducing temperature and pressure

Inactive Publication Date: 2020-12-11
天津市堃淏混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after long-term erosion of concrete waste, its interior will become soft and porous, resulting in a large number of micro-cracks on the surface of the obtained particles after crushing. When the concrete is subjected to loads, temperature differences, etc., the micro-cracks will continue to expand. and connected, which leads to a great reduction in the overall structural strength of the concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The present invention is a large-volume concrete and its preparation method, which is characterized in that it comprises the following components by weight: 170KG / M3 of water, 308KG / m3 of cement, 70KG / M3 of mineral powder, 56KG / M3 of fly ash, and Agent 10.3KG / M3, sand 694|KG / M3, stone 1076KG / M3.

[0023] The cement is medium and low heat Portland cement or heat slag Portland cement. The 3-day and 7-day heat of hydration of the cement conforms to the provisions of GB200 of "Medium-heat Portland Cement, Low-heat Portland Cement, and Low-heat Slag Portland Cement". When Portland cement and ordinary Portland cement are used , should be added to the mineral ginseng material, the three-day and seven-day hydration heat of the gel material should not be greater than 240KJ / kg and 270KJ / kg respectively, and the hydration heat test method should be carried out according to the "Measurement Method for Cement Hydration Heat" GB / T12959.

[0024] The sand is medium sand, the mud cont...

Embodiment 2

[0026] A method for preparing mass concrete, comprising the steps of:

[0027] Step 1, stirring and mixing water, cement, mineral powder, fly ash, sand and stones in corresponding parts by weight, and drying to obtain a mixture;

[0028] Step 2, adding filling reinforcing material and nano-filler in corresponding parts by weight to the mixture, stirring and drying to obtain the base material;

[0029] Step 3, putting water, water glass and water reducer in corresponding parts by weight into a mixing tank for stirring to obtain a mixed liquid;

[0030] Step 4: Soak the recycled concrete aggregate in the mixed solution, and after standing for a period of time, pour the base material in several times and keep stirring to obtain high-strength concrete.

[0031] By adopting the above technical scheme, drying and mixing the stones, medium sand, fly ash, Portland cement and mineral powder is beneficial to make them mix evenly and prevent the quality of high-strength concrete from be...

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Abstract

The invention provides mass concrete and a preparation method thereof, and the mass concrete is characterized by comprising the following components in parts by weight: 170 KG / M < 3 > of water, 308 KG / m < 3 > of cement, 70 KG / M < 3 > of mineral powder, 56 KG / M < 3 > of fly ash, 10.3 KG / M < 3 > of an admixture, 694 KG / M < 3 > of sand and 1076 KG / M < 3 > of stone. The performance of the mass concrete produced according to the invention can meet the requirements of strength grade, impermeability, volume stability and the like, and the hydration temperature rise of a cementing material is also controlled, so that the purposes of reducing temperature and pressure and preventing temperature cracks are achieved.

Description

technical field [0001] The invention relates to the field of construction, in particular to a large-volume concrete and a preparation method thereof. Background technique [0002] my country's "Construction Standards for Mass Concrete" GB50496-2018 stipulates that the minimum geometric size of the concrete structure entity is not less than 1m in mass concrete, 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] Mass concrete construction is often involved in modern buildings. Its main feature is its large size, and the minimum dimension of any direction of the minimum section is 0.8m. Its surface coefficient is relatively small, 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 conc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B18/08C04B14/02C04B14/06C04B2103/302C04B18/141
Inventor 宁志国赵羽
Owner 天津市堃淏混凝土有限公司
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