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Anti-freezing concrete and preparation method thereof

A technology for concrete and mixture, applied in the field of concrete, can solve the problems of limited impact, reduced compressive strength of concrete, low effectiveness, etc.

Inactive Publication Date: 2021-02-19
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, research on the frost resistance of concrete includes reducing the water-binder ratio and adding air-entraining agents. The water-binder ratio of concrete is the ratio of the water consumption per cubic meter of concrete to the amount of all cementitious materials. The weight of cementitious materials includes cement Weight and admixture weight, reducing the water-binder ratio can reduce the concrete saturation to a certain extent on the one hand, improve the frost resistance of the concrete, and on the other hand can also increase the strength of the concrete. Very limited impact, not very effective
The principle of enhancing the frost resistance of concrete by adding air-entraining agents is to introduce a large number of tiny air bubbles into the concrete, thereby increasing the air content inside the concrete and reducing the distance between air bubbles, so as to achieve the purpose of improving the frost resistance of concrete. However, if the air content Too large will also reduce the compressive strength of concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing frost-resistant concrete, which mainly comprises the following steps:

[0030] S1. Weigh aggregate, Portland cement, water, silica powder, gypsum and water reducing agent respectively and pour them into a container and stir until they are evenly mixed to obtain a mixture; wherein, by weight, 135 parts of 40-80 mesh quartz sand, 123 parts of Portland cement, 47 parts of water, 1.2 parts of water reducer, 15 parts of silica fume, and 12 parts of gypsum.

[0031] S2. Pour the mixture obtained in S1 into the bottom-covered mold, and manually vibrate it while pouring until the pouring is completed. After the mixture is left to stand indoors for 12 hours, it is demoulded. After demoulding, quickly put it in a curing pool at 20°C for 14 days. , the frost-resistant concrete can be obtained.

[0032] The frost-resistant concrete specimens obtained in this example were frozen at -20°C for 4 hours, and then thawed at 20°C for 4 hours. After repeating the fr...

Embodiment 2

[0034] A method for preparing frost-resistant concrete, which mainly comprises the following steps:

[0035] S1. Weigh aggregate, Portland cement, water, silica powder, gypsum and water reducing agent respectively and pour them into a container and stir until they are evenly mixed to obtain a mixture; wherein, by weight, 129 parts of 40-80 mesh quartz sand, 117 parts of Portland cement, 46 parts of water, 1.2 parts of water reducing agent, 16 parts of silica fume, 12 parts of gypsum;

[0036] S2. Pour the mixture obtained in S1 into the bottom-covered mold, and manually vibrate it while pouring until the pouring is completed. After the mixture is left to stand indoors for 12 hours, it is demoulded. After demoulding, quickly put it in a curing pool at 20°C for 14 days. , the frost-resistant concrete can be obtained.

[0037] After 30 freeze-thaw experiments using the method described in Example 1, the uniaxial compressive strength of the frost-resistant concrete obtained in th...

Embodiment 3

[0039] A method for preparing frost-resistant concrete, which mainly comprises the following steps:

[0040] S1. Weigh aggregate, Portland cement, water, silica powder, gypsum and water reducing agent respectively and pour them into a container and stir until they are evenly mixed to obtain a mixture; wherein, by weight, 128 parts of 40-80 mesh quartz sand, 142 parts of Portland cement, 54 parts of water, 1.4 parts of water reducing agent, 11 parts of silica fume, 14 parts of gypsum;

[0041] S2. Pour the mixture obtained in S1 into the bottom-covered mold, and manually vibrate it while pouring until the pouring is completed. After the mixture is left to stand indoors for 12 hours, it is demoulded. After demoulding, quickly put it in a curing pool at 20°C for 14 days. , the frost-resistant concrete can be obtained.

[0042] After 30 freeze-thaw experiments using the method described in Example 1, the uniaxial compressive strength of the freeze-resistant concrete obtained in t...

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Abstract

The invention relates to the technical field of concrete, in particular to anti-freezing concrete and a preparation method thereof. The anti-freezing concrete is prepared from the following componentsin parts by weight: 99-164 parts of aggregate, 115-154 parts of Portland cement, 44-61 parts of water, 1.1-1.5 parts of a water reducing agent, 8-17 parts of silicon powder and 12-15 parts of gypsum.According to the anti-freezing concrete, the silicon powder is added as an admixture, the silicon powder and cement can be hydrated to generate a hydraulic cementing material, and the silicon powderhas rheological property and can fill micro-cracks in the concrete, so that the pore structure in rock-like mass is improved, the bonding effect between internal particles and the cementing material is enhanced, and the impermeability and the frost resistance of the concrete are improved.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a frost-resistant concrete and a preparation method thereof. Background technique [0002] Due to the extremely harsh climate in the cold region, the temperature difference caused by the change of seasons and day and night changes is extremely large, which has great potential harm to concrete buildings, roads, bridges and tunnel projects. In recent years, since the surface and internal structure of concrete are prone to frequent freezing and thawing cycles due to temperature changes, this freezing-thawing cycle will damage concrete buildings, roads, tunnels and other projects, and it will also bring problems to engineering construction. Inconvenient, finally cause the damage of concrete engineering, seriously threaten people's property safety and life safety. [0003] Ordinary concrete refers to cement as the main cementitious material, sand and gravel as aggregates, mixed with...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B18/14C04B24/00C04B103/30
CPCC04B18/146C04B24/00C04B28/14C04B2103/302C04B2201/50C04B14/06C04B7/02C04B22/002Y02W30/91
Inventor 何旭杨小敏胡萌罗学东
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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