Measuring system and method for concrete non-load internal stress in concrete structure

Abstract

The invention relates to a measuring system and method for a concrete non-load internal stress in a concrete structure. The system comprises a metal block sensor, a temperature compensation block, a temperature sensor, a temperature heating box and a strain tester, wherein the metal block sensor and the temperature sensor are buried in to-be-measured concrete; the temperature compensation block is placed in the temperature heating box and is located on the to-be-measured concrete; the metal block sensor comprises a metallic lumpish test block; at least three mutually vertical strain gages are adhered to the test block; the temperature compensation block comprises a metallic lumpish compensation block; one temperature strain gage is adhered to the compensation block; the strain gages and the temperature strain gage are connected with the strain tester in the manner of 1 / 4 bridging; the poisson ratio and coefficient of linear expansion of the test block and the compensation block are similar to those of the concrete; the temperature sensor is connected with the temperature heating box. According to the invention, the influences of inner temperature change of the concrete in early period of the concrete and different rebar reinforcement ratios on the internal concrete stress can be avoided and the test precision is higher.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a measurement system and method for measuring the non-load internal stress of concrete in a concrete structure. Background technique [0002] In the concrete structure, the mechanical performance index of the early-age concrete develops very rapidly, and the concrete transforms from a plastic state to a solid state. Although the concrete structure does not bear the designed load at this time, the cracking problem of the early-age concrete often plagues the quality of the concrete project. The non-load stress in the early age of concrete includes temperature stress and shrinkage stress, and the development of these two stresses is the main reason for the early cracking of concrete. Since the creep performance of concrete is difficult to accurately determine at an early age, the internal stress of concrete cannot be determined by measuring the deformation of concrete at a...

AI Technical Summary

Problems solved by technology

However, in the above-mentioned technologies, the temperature compensation sheets are all buried in the concrete. In addition to the temperature interference, there are inevitably other interferences such as stress, so the compensation error is relatively large.

[0005] In addition, the existing technology cannot solve the effect of different reinforcement ratios on the internal stress of concrete

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