Sensing type crack sensing material as well as preparation method and application thereof

Abstract

The invention discloses a sensing type crack sensing material as well as a preparation method and application thereof. The sensing type crack sensing material comprises the following raw materials: carbon nanofibers, polyvinyl alcohol fibers, a polycarboxylic acid composite water reducing agent, a cementing material and machine-made sand, and the cementing material comprises fly ash, superfine slag powder and cement in a weight ratio of (50-70): (10-15): (20-25); the volume mixing amount of the carbon nanofibers is 0.5-1% of the total volume of the raw materials; the volume mixing amount of the polyvinyl alcohol fiber is 1-2% of the total volume of the raw materials. The sensing type crack sensing material and the preparation method and application thereof have the advantages that the strain deformation range is large, the crack development process can be well detected, the sensing type crack sensing material and a pavement can be cooperatively deformed, and long-distance transmission can be achieved.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a sensor-type crack induction material and its preparation method and application. Background technique [0002] Among various pavement diseases, pavement cracks are the most common type, and they are also the early manifestations of other pavement diseases. If the existence of cracks can be detected in time and maintained and managed, it can not only ensure the safety of road driving, but also Keep maintenance costs to a minimum. Various cement-based sensors, which have good compatibility with traffic structure acoustic impedance and matching, and have similar service life, have made great progress in the past few decades. It can be said that the success of various traffic structure monitoring systems is largely attributed to These smart sensors provide accurate and consistent traffic and structural data on bridges. [0003] As a special civil engineering structure, the ...

AI Technical Summary

Problems solved by technology

[0004] At present, the sensing elements used to measure structural strain include electromagnetic, resistive strain gauges, vibrating wire sensors, etc. Although such traditional measurement methods have high test accuracy and sensitivity to a certain extent, they are limited by other Its own physical and chemical properties, its stability, durability and anti-electromagnetic interference performance are not suitable for long-term health monitoring of road structures

[0005] With people's exploration and research on sensing elements, new intelligent sensing materials have emerged, such as optical fibers, piezoelectric materials, semiconductor materials, etc. Among them, optical fiber sensors are fragile and vulnerable, and are easily damaged when they are deformed during use. The survival rate of the sensor leads to the fact that the strain range of the current commercial optical fiber sensor generally does not exceed 1.5%.

Traditional piezoelectric materials are brittle and cannot be deformed together with the pavement structure

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