Anti-crack and self-repairing concrete and preparation method thereof

Abstract

The invention discloses anti-crack and self-repairing concrete and a preparation method thereof. The anti-crack and self-repairing concrete is prepared from the following components in parts by weight: 200-300 parts of cement, 100-180 parts of fly ash, 500-700 parts of crushed stone, 80-140 parts of water, 40-60 parts of hemihydrate gypsum, 50-100 parts of silicon powder, 20-40 parts of polypropylene fiber, 10-15 parts of a silane coupling agent, 60-80 parts of calcium oxide, 5-10 parts of a water reducing agent, 30-50 parts of ammonium chloride and 10-20 parts of barium hydroxide octahydrate;and the preparation method comprises the steps that concrete slurry is mixed, specifically, the cement, the fly ash, the crushed stone, the hemihydrate gypsum and the silica powder are mixed and stirred for 30-40 min, the water reducing agent and the water are added and stirred for 5-10 min, then the ammonium chloride and the barium hydroxide octahydrate are added and stirred for 40-60 min, thenthe polypropylene fiber and the silane coupling agent are added to be stirred for 20-30 min, and then the concrete slurry is obtained; and the calcium oxide is sealed and loaded into a fiberglass pipe, and then the fiberglass pipe loaded with the calcium oxide is mixed in the concrete slurry to obtain the anti-crack and self-repairing concrete. The anti-crack and self-repairing concrete and the preparation method thereof have the advantages that the prepared concrete is resistant to cracking, self-repairing of cracks is realized, and strength after repairing is high.

Description

technical field [0001] The invention relates to the technical field of building materials, more specifically, it relates to a crack-resistant self-repairing concrete and a preparation method thereof. Background technique [0002] Concrete structures have the advantages of good compressive strength, integrity, good moldability, and low cost, so they are widely used in industrial and civil buildings. However, there will inevitably be cracks in the concrete structure during use. Some of these cracks are load cracks, and some are temperature cracks. Further expansion will eventually reduce the service life of the concrete structure. Therefore, repairing concrete cracks is an important measure to prolong the life of structures. [0003] At present, the main crack repair methods mainly rely on regular inspection of the structure and artificial filling and repair of cracks to achieve the construction effect. Some structures with serious cracks will be rebuilt. These repair method...

AI Technical Summary

Problems solved by technology

[0004] The research on self-healing concrete has made staged progress at home and abroad in recent years. The principles of self-healing concrete are also various. Some use microbial capsules, and some use shape memory alloys. It is difficult to survive in the environment, and the formation of memory is a very expensive material. Therefore, it is the need of the development of the times to develop a self-healing concrete that is cheap, easy to construct, and can maintain and repair concrete cracks and ensure its strength.