Preparation method of crack self-repairing material for concrete

Abstract

The invention relates to a preparation method of a crack self-repairing material for concrete, belonging to the technical field of building materials. The crack self-repairing material for the concrete is prepared by adding epoxy resin coated urea-formaldehyde resin microcapsules, epoxy resin has strong adhesive force to the concrete and can effectively prevent the fracture of the concrete from expanding, an epoxy resin adhesive is a solid after curing and does not react with a urea-formaldehyde resin coating layer and the concrete, the epoxy resin adhesive-containing urea-formaldehyde resin microcapsules and a catalyst are dispersed in a composite material matrix, when the material generates a crack, stress concentration at the top of the crack causes the microcapsules to crack, a repairagent migrates to the crack by capillary siphon phenomenon to fill the crack and meet the catalyst added to the material, the core material undergoes physical and chemical changes to form good adhesion to complete the repair. Therefore, the self-repair polymer with the repair agent coated by the microcapsules can improve the service life of the concrete.

Description

technical field

[0001] The invention relates to a preparation method of a crack self-repairing material for concrete, belonging to the technical field of building materials. Background technique

[0002] Although concrete has a series of advantages such as high compressive strength, good durability, strong plasticity, strong environmental adaptability, and a wide range of materials, its own brittleness makes it inevitable to produce cracks and local cracks during molding construction and service. If these defects cannot be repaired in time, it will not only affect the strength and durability of concrete, but also affect the normal performance and service life of the building structure in severe cases. Therefore, the problem of concrete crack repair has become a research hotspot in academia and engineering circles.

[0003] Cracks in concrete structures are the main cause of reduced mechanical properties and reduced durability of buildings. There are various reasons for cra...