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Concrete crack-resistant grid template and production method thereof

A technology of concrete formwork and grid formwork, which is applied to the preparation of formwork/formwork components and building components on site, construction, etc., which can solve the problems of easy cracking, loss of fluidity and no strength of concrete, and achieve low construction cost , Effective micro-cracks occur, less effect of increase

Inactive Publication Date: 2012-03-21
THE FOURTH ENGIENERING OF CHINA RAILWAY18 BUREAU GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, a large number of studies have shown that more than 90% of concrete shrinkage cracks occur in the early stage. At this time, the concrete has just lost its fluidity and basically has no strength. Even if the shrinkage stress at this time is small, it is prone to cracking

Method used

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  • Concrete crack-resistant grid template and production method thereof
  • Concrete crack-resistant grid template and production method thereof
  • Concrete crack-resistant grid template and production method thereof

Examples

Experimental program
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preparation example Construction

[0025] A kind of preparation method of concrete anti-crack grid formwork is: comprise the following steps:

[0026] (1) Use cement to prefabricate rebar or sawtooth-shaped support strips so that the area exposed to the concrete surface is small and consistent with the appearance of the concrete, and the thickness of the support strips is 0.5-1 cm;

[0027] (2) Use cement to fix the support strips on the ordinary concrete formwork according to a certain distance, the sawtooth tip is close to the formwork, and the distance between the support strips is generally set at 50-100 cm;

[0028] (3) Lay the mesh cloth on the concrete formwork with support strips, fix the mesh cloth on the side edges of the concrete formwork with fixed pressure strips, and tighten the mesh cloth during operation so that it is 0.5-1 away from the surface of the formwork The height in centimeters is the thickness of the support bar.

Embodiment

[0030] Prepare 2 identical steel concrete forming square frames with an area of ​​100×100 centimeters and a height of 7 centimeters, respectively use the concrete anti-cracking grid formwork of the present invention and the common concrete formwork as the bottom plate of the square frame. Table 1 shows the slump and corresponding strength results of different ages for preparing C30 pumped concrete with the concrete mix ratio in Table 2.

[0031]

[0032] Pour the concrete evenly into the two forming boxes and fully vibrate them, then turn the two groups of concrete samples together with the steel boxes so that the original bottom faces up, and follow the demoulding method described in the "Content of the Invention" The concrete crack-resistant grid formwork is removed, and the ordinary concrete formwork is also removed. The two groups of concrete were exposed to a strong dry environment with a relative humidity of about 40%, a temperature of about 42°C, and wind blowing. T...

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Abstract

The invention relates to a concrete crack-resistant grid template which comprises a common concrete template, grid cloth, a plurality of supporting bars and fixing pressing bars. The supporting bars are fixed on the common concrete template. The grid cloth is laid on the common concrete template with supporting bars and fixed on peripheral side edges of the common concrete template by using the fixing pressing bars. The concrete crack-resistant grid template can effectively scatter the early shrinkage stress of the concrete and prevent the early crack of the concrete in large volume.

Description

Technical field: [0001] The invention relates to a building formwork, in particular to a concrete anti-cracking grid formwork to be used when pouring concrete and a preparation method thereof. Background technique: [0002] Massive concrete generally has serious shrinkage and cracking problems. Compared with ordinary concrete, it faces more factors that cause cracking, such as chemical shrinkage, settlement shrinkage, drying shrinkage, and unique internal and external temperature difference stress shrinkage. Traditional anti-cracking measures include reducing the heat of hydration by reducing the amount of concrete cement, using medium-low heat cement, adding concrete admixtures, and using retarding admixtures; using concrete expansion agents, shrinkage reducing agents, etc. to resist or compensate shrinkage. Mixing with ice and setting cooling water pipes in the concrete to cool down the interior; external coating measures are used for external insulation to reduce the tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G9/10
Inventor 李宗朱洪波杨长京刘勇
Owner THE FOURTH ENGIENERING OF CHINA RAILWAY18 BUREAU GROUP
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