Concrete elasticity modulus measuring method based on capillary pore stress

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...

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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 GB50081 of "Standards for Test Methods of Mechanical Properties of Ordinary Concrete" to calculate the restraint stress of concrete. Engineering situation

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