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Temperature-control anti-cracking curing method for mass concrete

A large-volume concrete, temperature control and anti-cracking technology, applied to thermometers, applications of thermometers, and parts of thermometers, etc., can solve problems such as high pre-embedded costs, limited cooling range of cooling pipes, and easy internal cracks in concrete, etc., to achieve Avoid temperature cracks, reliable performance, and reduce the effect of internal and external temperature differences

Pending Publication Date: 2021-10-01
江西省交通工程集团建设有限公司
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  • Claims
  • Application Information

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Problems solved by technology

However, this temperature control method cannot completely solve the problem of large-volume concrete temperature cracks; setting up cooling pipes will not only cost a high pre-embedding cost, but also cost pumping shifts and later grouting to seal the pipes; Since the concrete itself is a poor conductor of heat, the cooling range of the cooling pipe is very limited, and the concrete around the cooling pipe is prone to internal cracks due to the large temperature difference

Method used

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  • Temperature-control anti-cracking curing method for mass concrete

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Effect test

Embodiment 1

[0020] A temperature-controlled anti-crack maintenance method for C60 mass concrete arch ribs, such as figure 1 As shown, the specific steps are as follows:

[0021] A. Control the temperature of raw materials to meet the following requirements: the temperature of cement and mineral powder is ≤60°C, the temperature of fly ash is ≤40°C; the temperature of sand and gravel is ≤28°C, the water temperature is ≤10°C, and the water reducer is at room temperature;

[0022] B. According to the design strength of the concrete, mix the above raw materials according to the design ratio, and the temperature of the concrete after it is transported to the site is ≥5°C and ≤28°C; the specific weight ratio formula of the concrete is:

[0023] Cement: fly ash: mineral powder: sand: gravel: water: water reducing agent = 298: 100: 100: 749: 1079: 135: 7.47;

[0024] C. Embed three first temperature sensors 1 at the inner center of the concrete to measure the internal temperature value of the con...

Embodiment 2

[0031] A temperature-controlled anti-crack maintenance method for a C50 mass concrete abutment, such as figure 2 As shown, the specific steps are as follows:

[0032] A. Control the temperature of raw materials to meet the following requirements: the temperature of cement and mineral powder is ≤60°C, the temperature of fly ash is ≤40°C; the temperature of sand and gravel is ≤28°C, the water temperature is ≤10°C, and the water reducer is at room temperature;

[0033] B. According to the design strength of the concrete, mix the above raw materials according to the design ratio, and the temperature of the concrete after it is transported to the site is ≥5°C and ≤28°C; the specific weight ratio formula of the concrete is:

[0034] Cement: fly ash: mineral powder: sand: gravel: water: water reducer = 264: 130: 86: 751: 1081: 135: 5.28;

[0035] C. Embed three first temperature sensors 1 at the central position of the concrete to measure the internal temperature of the concrete; r...

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Abstract

The invention discloses a temperature-control anti-cracking curing method for mass concrete. According to the temperature-control anti-cracking curing method, according to the construction steps and requirements of mixing, temperature measuring and curing of the concrete, by adopting a concrete formula with a small cement dosage and applying a high-tech temperature measuring means, the temperature change which cannot be seen or touched inside the concrete is visualized, and a high-molecular moisturizing material and a heat-preservation rainproof material are combined for use, so that moisturizing and heat-preservation curing is carried out under the guidance of visualized temperature information, and the purposes of not using a cooling water pipe, reducing the temperature difference between the inner surface and the outer surface and avoiding temperature cracks after the concrete is hardened are achieved. According to the temperature-control anti-cracking curing method, the cooling water pipe does not need to be embedded, the technology is simple, the operation is controllable, the cost is saved, the performance is reliable, and no temperature crack occurs in the construction of a plurality of mass concrete.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a temperature-controlled anti-crack maintenance method for large-volume concrete. Background technique [0002] Due to the large volume of concrete in the early stage of pouring, the cement will generate a large amount of heat of hydration, the internal temperature will rise rapidly, and the volume will expand. After setting, the surface of the concrete will crack. Compressive stress is generated, but when the concrete cools and shrinks in the later stage of hardening, tensile stress will be generated, and the tensile stress will be greater than the compressive stress value generated by heating and expansion. When the tensile stress exceeds the ultimate tensile stress of concrete, cracks will be generated inside it, and may develop into through cracks, which will cause greater harm to structures. Therefore, the construction of mass concrete requires temperature control, so tha...

Claims

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Application Information

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IPC IPC(8): E04G21/24E02D15/02G01K13/00G01K1/024
CPCE04G21/246E02D15/02G01K13/00G01K1/024
Inventor 章哲明彭爱红赵国刚吴飞周靖尧谭志成华军周晟
Owner 江西省交通工程集团建设有限公司
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