A method for preparing concrete that can self-report damage

Abstract

Disclosed is a method for preparing a damage-self-reporting concrete, comprising the steps of dissolving PMMA in chloroform; dissolving CVL in phenyl acetate; then placing same in a vortex mixer for vortex mixing, so as to obtain an oil phase; adding a silica sol to distilled water as a continuous phase, and then subjecting the continuous phase and the oil phase to vortex mixing so as to obtain a pre-emulsion; adding a 1 M HCl solution to the pre-emulsion, and adjusting the pH of the pre-emulsion to 8.0; then subjecting same to an ultrasonic bath under ice bath cooling conditions to form an oil-in-water emulsion; stirring the resulting emulsion in a pre-heated oil bath at 40ºC to evaporate the chloroform, so as to obtain a suspension; cooling the resulting suspension to room temperature, and subjecting same to vacuum filtration to obtain a microcapsule; and adding a dispersion system of the microcapsules to a concrete slurry and stirring same, and casting same so as to obtain the damage-self-reporting concrete. The method combines visual sensing and concrete damage monitoring, that is to say, a color change means that a crack appears, which is intuitional and clear, and same has a high sensitivity and can reduce construction difficulties.

Description

technical field [0001] The invention relates to the field of concrete structure health monitoring, in particular to a method for preparing concrete capable of self-reporting damage. Background technique [0002] With the continuous development of the construction industry, a large number of engineering constructions are carried out in various places, but often due to various defects in design and construction quality, the buildings or structures are strained during the trial period. If the strain is too large, it will affect the structure. safety and durability. Therefore, it is particularly important to monitor the health of structures. [0003] At present, the structural health monitoring of buildings is mainly based on strain monitoring, relying on strain sensors, such as distributed optical fiber sensors. However, the traditional distributed optical fiber sensor has various shortcomings due to the optical fiber itself, which leads to the disadvantages of high cost, lar...

AI Technical Summary

Problems solved by technology

[0011] In order to solve the above technical problems, one of the objectives of the present invention is to provide a microcapsule dispersion system or a capsule-type visual strain sensor, which is applied to the structural health monitoring of concrete structures, and can perform real-time in-situ monitoring , the effect is intuitive and obvious, and the sensitivity is high, so as to solve the problems of the existing strain sensor such as complex process, inability to detect in situ in real time, poor precision, and large detection position limitations

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