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A self-dissolution self-healing system for concrete cracks and its preparation method

A concrete and self-dissolving technology, applied in the field of concrete engineering, can solve the problems of the influence of the strength and durability of the matrix, residues, etc., and achieve the effects of low cost, simple preparation method, and long-term effective repair effect.

Active Publication Date: 2017-07-28
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The self-assembled polymer microspheres prepared by the technical solution disclosed in the above patent will eventually remain in the cement-based material matrix, and as the age increases, the microspheres will have a negative impact on the strength and durability of the matrix

Method used

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  • A self-dissolution self-healing system for concrete cracks and its preparation method
  • A self-dissolution self-healing system for concrete cracks and its preparation method
  • A self-dissolution self-healing system for concrete cracks and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0058] like figure 1 As shown, porous or hollow SiO 2 The microspheres are loaded with repair agent by impregnation method, and then the surface is also loaded with a polymer protective film by impregnation; such a single microsphere is slowly eroded in the alkaline environment of cement-based materials. First, the protective film is slowly eroded and decomposed in the alkali, making the inorganic When the microspheres are exposed to an alkaline environment, the pores on the surface of the microspheres expand, opening channels for the repair agent to flow out; the repair process mainly plays a repair role through the following two ways: (1) when the cement-based material is destroyed and the external water environment enters , due to the concentration difference between the inside and outside of the microsphere, the repair agent is released through the pores on the surface and Ca 2+ Generate C-S-H to repair. Ca 2+ The repair agent is consumed to generate gel precipitation, ...

Embodiment 2

[0076] Accurately weigh 70g sodium silicate nonahydrate and add 230ml deionized water to make 10% sodium silicate solution (converted to SiO 2 Concentration is 54.6mg / ml), reserved for adsorption.

[0077] A part of SiO was treated by double salt pore expansion method. 2 The microspheres were subjected to pore expansion treatment, and 60mg of pore expansion SiO was weighed 2 and 60mg of unexpanded SiO 2 Immerse the microspheres in 60g (density 1.09g / ml, volume 55.04ml) sodium silicate solution, place it for 1d after ultrasonic dispersion, after 1d, centrifuge the solution in a centrifuge at 9000rad for 20min, absorb the supernatant according to the steps of preparing the working solution Prepare the solution, measure its absorbance, and query the corresponding concentration value according to the fitting curve, and then calculate the hole expansion and the hole expansion SiO2 from the difference between the initial concentration and the final concentration. 2 The adsorption...

Embodiment 3

[0085] In order to study expanded and unexpanded SiO 2 The release situation of microsphere carrier to sodium silicate, the present invention will 80mg hole-expanding SiO 2 Microspheres and Unexpanded SiO 2 The microspheres were immersed in 80g of 10% sodium silicate solution and ultrasonically dispersed and then left to stand for 1d. After the microspheres were fully adsorbed with sodium silicate, they were centrifuged at a speed of 9000r / min in a centrifuge to obtain SiO adsorbed with sodium silicate. 2 Microspheres. Take 19mg unexpanded SiO 2 Microspheres and 17 mg pore-expanding SiO 2 The microspheres were respectively placed in 100ml of distilled water, and 10ml of the solution was taken out at regular intervals, and the samples were prepared for the spectrophotometric test according to the sample preparation method of the spectrophotometric test. Compare the obtained absorbance with the standard curve, find out the concentration value and draw a curve.

[0086] Draw...

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Abstract

The invention relates to a concrete crack autolysis self-repairing system and a preparation method thereof. The system comprises an autolysis repairing carrier and an autolysis protective film that is covered on the surface of the autolysis repairing carrier. A repairing agent is loaded on the autolysis repairing carrier. In preparation, the autolysis repairing carrier is prepared through a sol-gel method, then the autolysis repairing carrier is subjected to a pore enlarging treatment; after the pore-enlarging treatment, the autolysis repairing carrier is impregnated in a solution of repairing agent, then centrifugal separation is performed, the upper layer supernate is removed, the repairing carrier on the bottom is washed and dried in vacuum so as to obtain the repairing agent supported autolysis repairing carrier; and finally the autolysis repairing carrier is impregnated in an autolysis protective film solution so that the autolysis protective film can fully cover the surface of the autolysis repairing carrier. Compared with the prior art, the advantages of mineral self repairing method and microcapsule self repairing method are combined, and an autolysis carrier self-repairing system is prepared and can be used to repair cracks in a structure made of cement based material.

Description

technical field [0001] The invention belongs to the technical field of concrete engineering, and relates to a concrete crack self-dissolving self-repair system and a preparation method thereof. Background technique [0002] In today's civil engineering, concrete structures are widely used in various environments. Among them, there are many environments with harsh conditions, such as underground structures. Under the long-term effects of multiple factors, their performance will continue to deteriorate. Once damaged, it is difficult or irreplaceable. It will induce underground engineering disasters. Cracks in cement-based materials are the fundamental cause of premature structural failure. [0003] The study of self-dissolving self-healing system provides a new solution for the repair of micro-cracks in concrete matrix and the effective delay of potential damage. Moreover, the self-dissolving self-repair system will eliminate the high cost of effective monitoring and externa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/02C04B7/32C04B12/02C04B12/04C04B20/10C04B24/30
CPCC04B7/02C04B7/32C04B12/025C04B12/04C04B20/1033C04B20/1037C04B24/302
Inventor 蒋正武仇铄
Owner TONGJI UNIV
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