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Method for loading cracks of prefabricated mortar test piece through three-point bending

A technology of three-point bending and mortar, which is applied in the field of hydraulic concrete material testing, can solve problems such as fixity and single crack shape, and achieve the effects of cost saving, single crack shape and simple operation

Active Publication Date: 2022-06-03
POWERCHINA XIBEI ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method of using three-point bending to load the cracks of prefabricated mortar specimens, the purpose of which is to solve the crack shape of specimens with cracks prepared by existing concrete mortar Uniformity and fixity, especially for crack prefabrication of self-healing concrete mortar, so as to effectively avoid the influence of carbonation reaction on the self-healing process of concrete during curing

Method used

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  • Method for loading cracks of prefabricated mortar test piece through three-point bending
  • Method for loading cracks of prefabricated mortar test piece through three-point bending
  • Method for loading cracks of prefabricated mortar test piece through three-point bending

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Effect test

Embodiment 1

[0037] refer to figure 1 and figure 2 A method for loading cracks in prefabricated mortar specimens using three-point bending is shown, including the following steps

[0038] Step 1: Place the mortar specimen 1 on the three-point bending test device;

[0039] Place one of the pre-prepared multiple mortar specimens 1 on the three-point bending test device;

[0040] Step 2: Apply a preset load to the mortar specimen 1 through a three-point bending test device and obtain a load-displacement curve;

[0041] Step 3: analyze the failure form and load-displacement curve characteristics of the prefabricated mortar specimen 1, and obtain the crack width on the surface of the mortar specimen 1 in different failure stages;

[0042] Step 4: Determine the failure load used when irregular cracks with preset widths can be prefabricated;

[0043] Step 5: Apply the failure load determined in Step 4 to the rest of the mortar specimens, and obtain the mortar specimen 1 that meets the width ...

Embodiment 2

[0051] refer to figure 1 and figure 2 A method for loading cracks in prefabricated mortar specimens by three-point bending is shown. On the basis of Embodiment 1, the three-point bending test device used in the first step is a computer-controlled compression and bending integrated machine. The computer-controlled compressive and anti-folding integrated machine includes at least one loading cylinder 5, two supporting cylinders 2, a force loading part and a computer; the force loading part is used to apply a load force to the sand sample 1 ; Described computer is connected with force loading part by electrical signal; Described two supporting cylinders 2 are fixed on the hydraulic platform 4 of the computer-controlled anti-compression and anti-folding machine; The upper part of described loading cylinder 5 is fixedly connected to the force loading part, and is located above the middle of the two supporting columns 2.

[0052] In actual use, the mortar specimen 1 is first plac...

Embodiment 3

[0056] refer to figure 1 and figure 2 A method of loading prefabricated mortar specimen cracks by three-point bending is shown, on the basis of the second embodiment, the two supporting cylinders 2 are fixed on the hydraulic platform 4 in parallel, and the loading cylinder 5 and the two supporting cylinders are fixed on the hydraulic platform 4 in parallel. The support cylinder 2 is parallel, and the axial directions of the support cylinder 2 and the loading cylinder 5 are both perpendicular to the long axis direction of the mortar specimen 1 .

[0057] The adoption of this technical solution makes it comply with the relevant regulations in Section 4 of GB / T 17671, so as to prepare a mortar specimen 1 that meets the preset crack width.

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Abstract

The invention belongs to the technical field of hydraulic concrete material tests, and particularly relates to a method for loading cracks of a prefabricated mortar test piece through three-point bending. One of the mortar test pieces is placed on the three-point bending test device, the preset load is applied to the mortar test piece through the three-point bending test device, and the load-displacement curve is obtained; analyzing the damage form and the load-displacement curve characteristics of the prefabricated mortar test piece, obtaining the crack width of the surface of the mortar test piece in different damage stages, determining the damage load adopted when the irregular crack with the preset width can be prefabricated, and applying the determined damage load to the other mortar test pieces. The mortar test piece meeting the width requirement of the prefabricated crack can be obtained, the problems of single crack shape and fixity of the crack test piece prepared from existing concrete mortar are solved, and the influence of carbonization reaction on the concrete self-healing process in the curing process is effectively avoided especially for crack prefabrication of self-healing concrete mortar.

Description

technical field [0001] The invention belongs to the technical field of hydraulic concrete material testing, and in particular relates to a method for loading cracks in a prefabricated mortar test piece by three-point bending. Background technique [0002] Concrete materials used in hydraulic structures often face service environments such as pressurized water, dry-wet cycle coupling, dissolution and erosion coupling, etc. In such complex environments, the mechanical properties and durability of concrete materials are also greatly reduced. Quality defects such as erosion are often difficult to repair. Therefore, how to improve the durability of hydraulic concrete materials is the key to solving this problem. Self-healing concrete has the function of self-diagnosing cracks and self-repairing cracks. When damage cracks occur in the base concrete, the repairing system embedded in the interior releases repairing agent under force, heat or chemical damage, and bonds and seals the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
CPCG01N1/286
Inventor 贺晶晶卢浩丹陆希狄圣杰赵坤龙樊李浩王海婷
Owner POWERCHINA XIBEI ENG
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