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Composite concrete self-repairing material and application thereof, and preparation method of self-repairing concrete

A self-healing material and concrete technology, applied in the field of concrete, can solve problems such as low self-healing efficiency

Pending Publication Date: 2022-01-11
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, current self-healing concrete incorporating mineral admixtures as healing agents has low self-healing efficiency

Method used

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  • Composite concrete self-repairing material and application thereof, and preparation method of self-repairing concrete
  • Composite concrete self-repairing material and application thereof, and preparation method of self-repairing concrete
  • Composite concrete self-repairing material and application thereof, and preparation method of self-repairing concrete

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preparation example Construction

[0028] The composite concrete self-repairing material provided by the invention includes carbonate light aggregate. In the present invention, the carbonate light aggregate preferably comprises lightweight aggregate and carbonate attached to the surface and pores of the lightweight aggregate; the preparation method of the carbonate light aggregate preferably comprises the following steps: The lightweight aggregate is soaked in the carbonate solution for 24 hours, and then dried; the present invention has no special limitation on the drying process, and the drying process well known in the art can be adopted. In the present invention, the lightweight aggregate is preferably clay ceramsite; the particle size of the lightweight aggregate is preferably 3-8mm; the natural water absorption of the lightweight aggregate is preferably 9.4-11.3%, more preferably 10 ~11%; The massfraction of described carbonate solution is preferably 10~20%, more preferably 10~15%; Described carbonate pre...

Embodiment 1

[0046] Fully mix 300g of sodium carbonate and 2700g of deionized water to prepare a sodium carbonate solution with a mass concentration of 10%. Soak 50g of lightweight aggregate (3-8mm, water absorption rate of 10.5%) in the sodium carbonate solution for 24 hours to make the lightweight aggregate fully Absorb sodium carbonate solution to obtain carbonate light aggregate;

[0047] Mix 86.5g of cement, 10g of calcium sulfoaluminate-based expansion agent (3-4μm), 2g of crystalline additive (18-20μm, calcium oxide, magnesium oxide and silicon dioxide in a mass ratio of 2:1:1), 1.5g di Calcium hydrogen phosphate water (8-10μm) and 0.5g sodium acrylate water-absorbing resin (520-530μm) are added to the stirring pot, and the speed of the stirring blade is adjusted to 140r / min to fully stir for 1min, and then add 200g of standard sand (0.16-1.25mm ) and 50g of carbonate light aggregate and maintain the speed of the stirring blade at 140r / min and fully stir for 4min. At the same time, ...

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Abstract

The invention belongs to the technical field of concrete, and particularly relates to a composite concrete self-repairing material and application thereof, and a preparation method of self-repairing concrete. According to the invention, calcium and magnesium ions provided by a mineral admixture and carbonate provided by lightweight aggregate increase the concentration of calcium, magnesium ions and carbonate ions at concrete cracks, so generation of calcium carbonate, magnesium hydroxide and magnesium carbonate is facilitated; and water can be taken away and released under a high-humidity condition due to the swelling capacity of water-absorbent resin, and the water is used for supplementing water needed in the forming process of calcium carbonate, magnesium hydroxide and magnesium carbonate and accelerating generation of new C-S-H crystals, so finally, concrete crack closing is promoted, and self-healing efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a composite concrete self-repairing material, an application thereof, and a preparation method of self-repairing concrete. Background technique [0002] Since Portland cement was successfully prepared, the raw materials for preparing cement are easy to obtain, and the cement exhibits high plasticity and compressive strength properties, so that cement has been widely used in modern construction projects. However, due to the long-term complex service environment of concrete, that is, the combined effects of harmful ions, external environmental stress, and self-drying shrinkage, it is inevitable to form micro-cracks or micro-damages inside. If the internal micro-cracks or micro-damages cannot be repaired in time, if they are allowed to develop, it is very likely to develop into macro-cracks that are difficult to repair, thereby affecting the service life and durability ...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B24/38C04B28/00
CPCC04B40/0039C04B28/00C04B2201/50C04B22/14C04B22/064C04B22/066C04B22/06C04B22/16C04B14/26C04B24/26C04B24/38C04B14/06
Inventor 王险峰陈少聪李大望李龙元
Owner SHENZHEN UNIV
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