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Evaluation method for cracking resistance of cement-based material

A technology of cement-based materials and anti-crack performance, which is applied in the field of building materials, can solve the problems of inability to evaluate the anti-crack performance of cement-based materials, and the cracks are not concentrated, so as to reduce the risk of cracking, improve service life, and improve economic benefits and society. benefit effect

Inactive Publication Date: 2013-07-03
FUZHOU UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the existing flat plate method and cracking ring method is that the cracks are not scattered and concentrated, and it is impossible to correctly evaluate the crack resistance of cement-based materials within the specified time
[0005] Patent ZL 200610069124.0 proposes a test device for crack resistance of cement-based materials with partitions and its test method, which solves the problem of scattered and non-concentrated cracks, but the supporting evaluation method for crack resistance of cement-based materials needs further invention and creation

Method used

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  • Evaluation method for cracking resistance of cement-based material
  • Evaluation method for cracking resistance of cement-based material
  • Evaluation method for cracking resistance of cement-based material

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Embodiment 1

[0030] 1. Test raw materials

[0031] P.O42.5 cement (Lianshi brand), Minjiang river sand (fine sand), gravel (Fuqing sand and gravel factory), fly ash (Huaneng Power Plant Class II fly ash), water reducer (Fujian Chuangxian Project Material Co., Ltd. CX-8 polycarboxylate superplasticizer), water.

[0032] 2. Concrete mix ratio

[0033] The designed concrete mix ratio is shown in Table 1, which is divided into fly ash mixed group (I group) and fly ash-free group (II group), and the strength grades are C30, C40 and C50. For example, C30I refers to the concrete mixed with fly ash and the strength grade is C30.

[0034] Table 1 Concrete mix ratio

[0035] Numbering Cement (kg / m 3 ) Water (kg / m 3 ) Fly ash (kg / m 3 ) Sand (kg / m 3 ) Stone (kg / m 3 ) Water reducer (kg / m 3 ) water-binder ratio Sand rate (%) C30Ⅰ 235 152 72 703 1240 3.07 0.53 37 C30Ⅱ 287 152 0 726 1235 2.87 0.53 37 C40Ⅰ 297 152 91 634 1235 3.88 0.42...

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Abstract

The invention relates to an evaluation method for the cracking resistance of a cement-based material, which comprises the following steps: firstly, performing cracking resistance testing and mechanical property testing on the cement-based material to be evaluated; then, calculating the circumferential tensile stress of a cement-based material ring by measured inner ring strain, and fitting out the tensile or breaking strength of the cement-based material by a mechanical property obtained by the testing, varies along with time; and drawing out a curve for the specific value of the circumferential tensile stress of the cement-based material ring and the tensile or breaking strength, and performing rapid and correct evaluation on the cracking resistance of the cement-based material accordingto the development tendency of the curve in the specified age and area enclosed by the curve.

Description

technical field [0001] The invention belongs to the technical field of building materials, and more specifically relates to a method for evaluating the crack resistance of cement-based materials. Background technique [0002] Cement-based materials, including concrete and mortar, have become the most commonly used building materials in the world today due to their many advantages. However, cement-based materials will shrink during curing and hardening, and when the shrinkage is restrained, tensile stress will be generated, and when the tensile stress exceeds its tensile strength, cracking will occur. Once the cement-based material cracks, harmful substances from the outside will invade the interior of the cement-based material, causing material degradation or steel bar corrosion, thereby affecting the safety and durability of the structure. [0003] A large number of engineering practices have proved that cracks (or micro-cracks) in the structure of cement-based materials (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/00
Inventor 季韬林旭健刘春苹
Owner FUZHOU UNIV
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