Ion response gel applicable to cement silicate self-repairing systems, preparation method and application

Abstract

The invention discloses ion response gel applicable to cement silicate self-repairing systems, a preparation method and an application. Preparation comprises the following steps: preparing a biogel solution containing a polyhydroxy complexing structure; dropping the biogel solution to a divalent cation coagulating bath under stirring, and performing standing and drying to obtain the gel. Water isadopted as the solvent, so that little pollution is produced, cost is low, and the method is simple. The ion response gel based on water swelling and deposition reaction with divalent ions is applicable to various self-repairing systems and has low dependence on external repairing conditions. The expansibility is low in an initial hydration stage under the ion response action, and mechanical property loss of a cement matrix is reduced greatly; by the deposition reaction of the internally crosslinking divalent cations with the ambient environment, deposition of a self-repairing product is accelerated, and interfacial adhesion between the self-repairing gel and the cement matrix is improved. Subjective time of repairing is shortened by means of crack sealing and deposition of the self-repairing product, and the gel can adapt to short-time repairing work and can be used independently.

Description

technical field [0001] The invention relates to an ion-responsive gel suitable for a cement silicate self-repair system, a preparation method and application thereof, and belongs to the field of cement self-repair. Background technique [0002] Due to the brittle nature of cement stone, cracks caused by internal structure shrinkage and external loads are inevitable. The creation of cracks increases the penetration of aggressive substances into the interior of the cementitious substrate, reducing the stability and functionality of the infrastructure. Although the use of toughening materials reduces cracking, it cannot be avoided, even in the early stages of forming. The process of detecting and repairing cracks is often time-consuming and labor-intensive, especially for large-scale infrastructure such as highways and tunnels that are in continuous service phase, such repairs are almost impossible. Inspired by the self-healing function of biological systems, it is imminent t...

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Problems solved by technology

[0003] The water-swelling properties of superabsorbent resin make it a crack plugging agent. However, due to its easy expansion during the slurry mixing process, it is easy to cause holes in the solidified cement matrix and reduce the mechanical properties of the cement.

Moreover, the plugging of cracks cannot achieve self-healing, and the interface adhesion between the superabsorbent resin and the cement matrix is ​​poor, and the temporary plugging area is very easy to develop into a secondary crack-prone area

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