Self-repairing concrete and preparation method thereof

Abstract

The invention discloses self-repairing concrete and a preparation method thereof. The self-repairing concrete comprises the following raw materials, in parts by weight: 200-300 parts of cement, 350-450 parts of sand, 800-1000 parts of gravel, 60-100 parts of water, 60-80 parts of sodium alginate, 35-55 parts of calcium chloride, 10-20 parts of sodium dodecyl sulfonate, 35-55 parts of hydroxymethyl cellulose, 40-60 parts of anti-cracking fibers, 10-20 parts of a silane coupling agent, 5-10 parts of a water reducing agent, 15-30 parts of calcium oxide and 20-30 parts of repair capsules; and the preparation method comprises the following steps: mixing the cement, the sand, the gravel, the sodium alginate and the hydroxymethyl cellulose under stirring, adding the sodium dodecyl sulfonate, the anti-cracking fibers and the silane coupling agent, performing mixing under stirring for 10-20 min, adding the water reducing agent and the water, performing stirring for 40-50 min, adding the calcium chloride and the calcium oxide, performing stirring for 20-30 min, finally adding the repair capsules, and performing stirring to obtain the self-repairing concrete. The self-repairing concrete provided by the invention has the advantages that the raw materials for preparing the concrete are easy to obtain, the construction is convenient, cracks of the concrete can be subjected to self repairing and the strength is higher after the cracks are repaired.

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 is a kind of uneven, porous and brittle cement-based composite material. It is the most common and important building material. Due to the daily use and the environment, some tiny cracks or cracks often appear on the surface of concrete components. When tiny cracks appear on the concrete surface, the concrete itself will undergo tensile deformation, which will exceed the tensile strength of the concrete, and eventually evolve into macroscopic cracks that will endanger building safety and even cause irreparable losses. At present, people mostly take remedial measures such as grouting and plugging to repair macroscopic cracks in concrete, but they can't do anything about microscopic cracks in concrete and their prevention. When repairing manu...

AI Technical Summary

Problems solved by technology

[0003] At present, researches at home and abroad have adopted measures such as adding microcapsules, hollow glass fibers, microorganisms, shape memory alloys, and using organic adhesives as self-repairing materials as repair carriers. However, it is difficult to mix and pour when mixed into concrete, which increases the difficulty of construction. , Bacteria can hardly survive in the environment of high alkalinity like concrete, and shape memory chips are quite expensive and difficult to prepare materials. Strong self-healing concrete is the need of the development of the times