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Test method for crack-resistant performance of concrete and outside-square inside-round test apparatus therefor

A test device, the technology of outer square and inner circle, applied in the field of concrete, achieves the effects of low price, intuitive evaluation index, and reliable restraint

Active Publication Date: 2010-05-12
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, due to the nature of the cement concrete material itself, there is no concrete that is guaranteed not to crack when used in structures

Method used

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  • Test method for crack-resistant performance of concrete and outside-square inside-round test apparatus therefor
  • Test method for crack-resistant performance of concrete and outside-square inside-round test apparatus therefor
  • Test method for crack-resistant performance of concrete and outside-square inside-round test apparatus therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: A bridge project needs to compare the effects of different cements A, B, and C on the crack resistance of concrete to optimize the mix ratio. 3d test results are shown in Table 1. Obviously, cement C is better in terms of shrinkage and crack resistance.

[0028] Table 13d Observation data of fracture width (mm)

[0029]

Embodiment 2

[0030] Example 2: Two kinds of mix ratios have been preliminarily selected for the concrete of a certain water channel. The maximum particle size of the aggregate is 25mm, and the 28d strength is 41.0MPa and 41.3MPa respectively. The economic analysis results are also basically the same. Choose between the two ratios.

[0031] Table 2 Observation results of fractures at different times (mm)

[0032]

[0033] According to the performance of the concrete, the variable side is adjusted to 240mm, and the construction site is maintained under the same conditions. The test structure is shown in Table 2. The test results show that the shrinkage and crack resistance of mix ratio A is obviously superior.

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Abstract

The related test device for concrete anti-crack performance comprises: an inner constraint column, an outer cubic die, and a base with a locating pin on middle to connect the column. This invention needs simple matched devices and operation method, has explicit evaluation index, and fit to control concrete quality.

Description

technical field [0001] The invention relates to a concrete crack resistance test method and an outer square inner circle test device, belonging to the technical field of concrete. Background technique [0002] Cracks are an important factor affecting the durability of concrete structures. The factors affecting concrete cracking are complex. When the number and size of cracks reach a certain level, reinforced concrete members will gradually deteriorate due to the intrusion of corrosive media in the environment. [0003] Due to the frequent occurrence of cracking in concrete structures, especially early cracking, cracking mechanism and crack control have become hot issues in international and domestic concrete technology in recent years. Most of the published articles discuss more about concrete mix ratio, construction quality control, etc., and always hope to find a "non-cracking concrete mix ratio", or some "additives that can make concrete not crack". Unfortunately, due to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/38
Inventor 干伟忠苏月燕
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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