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

A silicate and self-repairing technology, which is applied in the field of cement self-repairing, can solve the problems that cracks cannot be self-repairing, reduce the mechanical properties of cement, and poor interface adhesion, etc., and achieve the effects of shortening the main body time, low cost and accelerating deposition

CN108840586AInactive Publication Date: 2018-11-20TIANJIN UNIV
0 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-11-20
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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...

Examples

Embodiment 1

[0030] A method for preparing an ion-responsive gel suitable for a cement silicate self-repairing system, comprising the following steps:

[0031] (1) configuration mass fraction is the chitosan aqueous solution of 1%;

[0032] (2) Under stirring, the chitosan aqueous solution obtained in step (1) is dropped into a 0.25mol / L magnesium chloride aqueous solution in a ratio of 1:2 by volume, and left for 24 hours, freeze-dried to obtain silicic acid suitable for cement Ion-responsive gels for salt self-healing systems.

[0033] Mix 2.5g of the ion-responsive gel suitable for the cement silicate self-repairing system obtained in this example into 500g of Jiahua G grade oil well cement powder, add water according to the water-cement mass ratio of 0.44, and mix the slurry uniformly at room temperature Cement blocks were obtained after curing for 7 days. A crack with a width of about 120 μm was obtained through a compressive test. An aqueous solution of sodium silicate with a mass f...

Embodiment 2

[0035] A method for preparing an ion-responsive gel suitable for a cement silicate self-repairing system, comprising the following steps:

[0036] (1) configuration mass fraction is the carrageenan aqueous solution of 0.5%;

[0037] (2) Under stirring, drop the carrageenan aqueous solution obtained in step (1) into a 0.02mol / L calcium chloride aqueous solution at a ratio of 1:2 by volume, place it for 12 hours, and freeze-dry to obtain silicic acid suitable for cement. Ion-responsive gels for salt self-healing systems.

[0038] The repair experiment is the same as in Example 1, and the effect is similar to that of Example 1.

Embodiment 3

[0040] A method for preparing an ion-responsive gel suitable for a cement silicate self-repairing system, comprising the following steps:

[0041] (1) configuration mass fraction is 2% sodium alginate aqueous solution;

[0042] (2) Under stirring, drop the sodium alginate aqueous solution obtained in step (1) into a 0.5mol / L calcium chloride aqueous solution at a volume ratio of 1:4, leave it for 24 hours, and freeze-dry to obtain silica gel suitable for cement. Ion-responsive gels for salt self-healing systems.

[0043] Pectin was used instead of sodium alginate in this example, and the others were the same as in this example to obtain an ion-responsive gel suitable for cement silicate self-repairing systems.

[0044] The repair experiment is the same as in Example 1, and the effect is similar to that of Example 1.