Method and device for evaluating repair performance of cement-based self-repair material

Abstract

The invention discloses a method and a device for evaluating repair performance of a cement-based self-repair material. The method comprises the following steps: applying pressure to a cement-based self-repair material sample, synchronously performing dynamic monitoring on change of crack width until produced cracks reach set width, and maintaining constant application pressure; curing the to-be-tested cement-based self-repair material sample, performing dynamic monitoring on the change of crack width synchronously until crack self-repair reaches a stable state, and finally, analyzing and evaluating data obtained by dynamic monitoring. Stress-strain change of the cracks on the surface of the cement-based sample can be observed in real time, the stress-strain change process of the cement-based material in the repair process can be visually reflected, the change process of the cracks when the cracks grow with age can also be observed in real time, and self-repair performance of the cement-based material can be evaluated by observing the dynamic change of the cracks.

Description

technical field [0001] The invention relates to the technical field of cement-based materials, in particular to a method and device for evaluating the repair performance of cement-based self-repairing materials. Background technique [0002] As one of the most commonly used building materials, cement-based materials have the advantages of easy molding, high strength, and good durability. However, cement-based materials often produce microcracks due to their own shrinkage and environmental loads during use. The occurrence will seriously reduce the durability and safety performance of cement-based materials. For example, the generation of cracks will lead to water seepage of cement-based materials and the corrosion of steel bars in cement-based materials by harmful ions. Therefore, it is necessary to take measures to prevent and control the occurrence of micro-cracks in cement-based materials and to repair the micro-cracks that have occurred. In order to save manpower and cost...

AI Technical Summary

Problems solved by technology

Most of the existing evaluation methods for the self-healing performance of cement-based materials are to observe the healing of cracks through the crack observer after man-made cracks. Although these methods are simple, they can only evaluate the repair of surface cracks. For deep cracks inside It cannot be directly observed, and is limited to the accuracy of the crack observer. Small cracks (≤0.1mm) cannot be observed. The method of evaluating the repair performance of self-healing cement-based materials is too single and has great limitations

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