Device and method for detecting deformation stress of on-site cement-based material

Abstract

The invention discloses a device and method for detecting deformation stress of an on-site cement-based material. Due to the fact that detection of shrinkage or expansion stress generated by concretedeformation is high in precision requirement, large in difficulty, low in efficiency and poor in accuracy, a test device and method for rapidly evaluating the shrinkage or expansion stress of concreteon a construction site are deficient. The two ends of a sleeve are detachably connected with the two end covers; an arched plate is arranged in the sleeve; an upper strain gauge and a lower strain gauge are arranged on the top surface and the bottom surface of the arched plate respectively; a first slender rod and a second slender rod are arranged at two ends of the arched plate respectively; oneend of the first slender rod is fixedly connected with the arched plate, and the other end of the first slender rod penetrates through the end cover close to the first slender rod; one end of the second slender rod is fixedly connected with the arched plate, and the other end of the second slender rod penetrates through the end cover close to the second slender rod and then is detachably connected with a movable outer cover; and a hanging opening is machined in the end, matched with the movable outer cover, of the second slender rod. The detection method is realized on the basis of the detection device. The method is used for detecting the shrinkage or expansion stress of the cement-based material.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a detection device and a detection method for deformation stress of cement-based materials on site. Background technique [0002] The volume deformation of concrete is one of the important factors affecting the long-term strength and durability of cement-based materials. The volume deformation of cement-based materials under normal temperature or high temperature environment includes chemical shrinkage, plastic shrinkage, temperature shrinkage, drying shrinkage and carbonization shrinkage, etc. The deformation of cement-based materials at negative temperatures is more complicated. In addition to chemical shrinkage, plastic shrinkage, drying shrinkage, and carbonation shrinkage, the temperature deformation may be manifested as frost heave due to free water freezing. When the frost heave stress is greater than the early tensile strength of concrete When the s...

AI Technical Summary

Problems solved by technology

It is difficult to quantitatively detect the shrinkage (frost heave) stress of cement-based materials under high temperature, normal temperature or negative temperature environment

In short, due to the high precision requirements, difficulty, low efficiency, and poor accuracy of concrete deformation stress detection, the lack of test devices and methods for quickly evaluating concrete deformation stress before construction, the quality of civil engineering construction using high-performance cement-based materials Seriously impacted and urgently needed to be resolved quickly

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