A kind of anti-cracking self-healing concrete and preparation method thereof

Abstract

The invention discloses a crack-resistant self-repairing concrete and a preparation method thereof. The crack-resistant self-repairing concrete comprises 200-300 parts of cement, 100-180 parts of fly ash, 500-700 parts of gravel, 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 silane coupling agent, 60‑80 parts of calcium oxide, 5‑10 parts of water reducer, 30‑50 parts Ammonium chloride, 10-20 parts of barium hydroxide octahydrate; its preparation method is mixing concrete slurry, mixing cement, fly ash, crushed stone, hemihydrate gypsum and silica fume, stirring for 30-40min, adding Water reducer and water, after stirring for 5-10min, add ammonium chloride and barium hydroxide octahydrate, stir for 40-60min, then add polypropylene fiber and silane coupling agent and stir for 20-30min to obtain concrete slurry; The calcium is sealed in the glass fiber tube, and then the glass fiber tube filled with calcium oxide is mixed in the concrete slurry to obtain the anti-crack self-repairing concrete. The invention has the advantages that the prepared concrete is anti-cracking, self-repairing cracks and has high strength after repairing.

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.