Concrete elasticity modulus measuring method based on capillary pore stress

A technology of elastic modulus and measurement method, which is applied in the direction of measuring devices, strength characteristics, instruments, etc., can solve problems such as large restraint stress, inaccurate concrete restraint stress, and inconformity with actual engineering conditions, and achieve small errors and accurate results Effect

Active Publication Date: 2021-02-05
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is inaccurate to calculate the restraint stress of concrete by using the static compressive elastic modulus of concrete tested in GB500

Method used

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  • Concrete elasticity modulus measuring method based on capillary pore stress
  • Concrete elasticity modulus measuring method based on capillary pore stress
  • Concrete elasticity modulus measuring method based on capillary pore stress

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Experimental program
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Embodiment

[0039] A preferred embodiment of the concrete modulus of elasticity measurement method based on capillary stress of the present invention comprises the following steps:

[0040] Step S1, assembling a concrete mold, the concrete mold is preferably rectangular, and the size of the cavity inside the concrete mold is 1000mm×200mm×200mm. The base plate and the four side plates of the concrete mold are all made of plexiglass plates 1, and the plexiglass plates 1 are fixed with angle steel 2 and screws for easy removal. The length direction of the concrete mold is selected as its axial direction, and the bolt 4 is selected as the probe. The center of the two side plates of the concrete mold located in the length direction is respectively provided with a through hole 3 matching the shape of the bolt 4. The bolts 4 are passed through the corresponding through holes, and are screwed and fixed on the side plates.

[0041] Step S2, pour concrete into the concrete mold, and embed one end ...

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Abstract

The invention relates to the field of concrete mechanical property tests, and particularly discloses a concrete elasticity modulus measuring method based on capillary pore stress. The method comprisesthe following steps of: firstly, assembling a concrete mold, and then pouring concrete into the concrete mold to form an elasticity modulus test piece with probes at two ends; removing the concrete mold after the elasticity modulus test piece is initially set, and measuring the shrinkage strain and the shrinkage stress of the elasticity modulus test piece at a measurement moment t1 and a measurement moment t2; and calculating the elasticity modulus Et(delta t) of the elasticity modulus test piece relative to the capillary pore stress within delta t time, thereby obtaining the elasticity modulus of the concrete relative to the capillary pore stress. The elasticity modulus measuring method based on the capillary pore stress adopted by the invention does not need external loading, so that interference of external factors like the loading speed is avoided, the elasticity modulus of concrete relative to the capillary pore stress can be accurately measured, the constraint stress of the concrete is calculated, and the calculation method is smaller in error and more accurate in result.

Description

technical field [0001] The invention relates to the field of concrete mechanical performance testing, and specifically discloses a method for measuring the elastic modulus of concrete based on capillary stress. Background technique [0002] According to statistics, at present, 80% of the cracking of concrete is caused by deformation factors such as shrinkage. In the study of shrinkage cracking of concrete, the accurate calculation of the restraint stress of concrete is the main means to predict the cracking performance of concrete. [0003] According to the stress-strain relationship, the formula for the restraint stress of concrete can be expressed as: [0004] σ t =ε t ×E C [0005] Among them, σ t is the confinement stress of the concrete, ε t is the strain of concrete under the restraining stress. E. C is the modulus of elasticity of the concrete. [0006] At present, when calculating the confinement stress of concrete, the elastic modulus of concrete used is m...

Claims

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Application Information

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IPC IPC(8): G01N3/06G01N3/02
CPCG01N3/02G01N3/062G01N3/066G01N2203/0075G01N2203/0605G01N2203/0617
Inventor 黄乐鹏华建民谢卓霖苏常旺周枫滨薛暄译陈增顺王能
Owner CHONGQING UNIV
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