Method for matching corresponding drying shrinkage under internal humidity gradient of cement-based material

Abstract

The invention discloses a method for matching corresponding drying shrinkage under humidity gradient in a cement-based material, which comprises the following steps of: matching acquired humidity gradient data at each position in a cement-based sample with acquired drying shrinkage gradient data at each position in a parallel sample, and thus, the drying shrinkage condition of each position in the cement-based sample under the corresponding humidity is obtained. According to the method, the corresponding relation between the continuous humidity field and the strain field in the same sample can be obtained in a short time, and the experiment time and resource consumption are greatly reduced. Compared with a traditional method, the obtained strain is under the real-time and real humidity gradient in the drying process, interference of the time effect of long-time drying is avoided, the number of statistical points reaches tens of thousands, errors of manual calculation are reduced, and the method is an effective method for accurately and rapidly obtaining the cement concrete internal humidity-drying shrinkage deformation relation.

Description

technical field [0001] The present invention relates to a method of matching the corresponding drying shrinkage under a humidity gradient within a cement-based material. Background technique [0002] With the increasing scale of concrete use, its durability is becoming more and more prominent. Shrinkage cracking of cement concrete is a key factor affecting the durability of concrete. Drying shrinkage has become an important and most complicated research object due to its high proportion of the total amount, long existence time, and many uncontrollable factors. Drying shrinkage can account for more than 80% of shrinkage deformation, and it is a long-term behavior, so drying shrinkage has a greater impact on this type of material. When the humidity gradient is generated inside and outside the cement concrete, the water will be lost to the outside, the outer surface will lose water faster, and the deformation will be larger than that of the inside. Cracks will not only direc...

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In view of the prior art, the present invention either uses the average shrinkage value in the one-dimensional direction to represent the drying shrinkage deformation at different positions of the entire sample, or measures the drying shrinkage under equilibrium humidity, which has large measurement errors and cannot obtain the corresponding internal humidity gradient of the sample. In order to solve the drying shrinkage problem of cement-based materials, a method is proposed to match the corresponding drying shrinkage under the humidity gradient in cement-based materials.

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