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Method for testing anti-cracking performance of cement base material

A technology of cement-based materials and anti-cracking performance, applied in the direction of analysis materials, measuring devices, instruments, etc., can solve problems such as damage to the test piece, affect the results of the test, increase the test workload, etc., to improve the experimental accuracy, reduce labor, The effect of reducing variance

Inactive Publication Date: 2010-01-20
TIANJIN UNIV
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Problems solved by technology

[0005] However, since the initial conditions and boundary conditions of the annular specimen along the ring direction are almost the same, the cracking position of the specimen cannot be determined during the test, and the whole process requires regular observation by the test personnel, which increases the workload of the test
Some experts also use the method of artificially making gaps in the test piece to limit the cracking position, but this method has certain damage to the test piece, and due to the difference between the gaps, the damage is different, which cannot truly reflect the actual situation and affects the cracking position. test results

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  • Method for testing anti-cracking performance of cement base material
  • Method for testing anti-cracking performance of cement base material
  • Method for testing anti-cracking performance of cement base material

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Embodiment Construction

[0016] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0017] A method for testing the crack resistance of cement-based materials in the present invention:

[0018] Before the test, a ring test piece 1 made of a plexiglass base 4, an upper cover 3, and a side mold 5 is adopted to make a ring test piece 1, as figure 1 shown. After the final setting of the test piece, the plexiglass upper cover 3 and the side mold 5 of the ring test mold are removed, and the outer circular surface of the test piece 1 is completely exposed. Apply sealant 6 to the interval, such as figure 2 and image 3 As shown, the water loss position of the ring test piece is limited by applying sealant, so as to control the humidity inside the test piece. Drying shrinkage occurs at the position, and the resulting strain is g...

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Abstract

The invention discloses a method for testing the anti-cracking performance of a cement base material, comprising the following steps: (1), coating sealing glue on one part of a region of an external circular surface of a circular test piece provided with a limiting steel ring according to the length of a strain gauge; and (2) sticking the strain gauge on the other part of the region of the external circular surface of the circular test piece. The strain gauge is connected with a strain gauge. The invention can automatically record cracking time. When a crack exists on the circular test piece, the strain gauge struck on the side face is stretched suddenly, thus a strain value is mutated, then the cracking time of the test piece can be obtained, and labor of testers is reduced. Possibility of racking position in the sealant region is avoided by the sealing glue, and probability of racking position in the region without the sealing glue is increased.

Description

technical field [0001] The invention relates to a method for testing the anti-crack performance of cement-based materials, in particular to a method for testing the anti-crack performance of cement-based materials by using a circular test piece. Background technique [0002] Ring-confined shrinkage test is an experimental method to investigate the anti-crack performance of early-stage confined concrete. During the experiment, steel rings are used to provide radial and tangential constraints to the concrete at the same time, so that it cannot shrink freely, and can detect the cracking behavior of the test under different conditions such as temperature and humidity. It reflects the crack resistance of hardened cement paste and concrete by cracking time. [0003] The annular confinement contraction experiment was invented by Carison of MIT in the 1940s. In 1988, R.W.Carison used a concrete ring with a radial thickness of 25mm, a height of 38mm, and an inner diameter of 175mm ...

Claims

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Application Information

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IPC IPC(8): G01N19/00
Inventor 朱涵骆斌杨林虎谢震
Owner TIANJIN UNIV
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