An Introduction of concrete self-healing admixtures
Keywords
Concrete, self-healing admixture, complex type, expansion agent, polycarboxylate superplasticizer
Concrete is a brittle building material, and there will be some cracks and voids inside the concrete. With the prolongation of the service time of concrete materials, the internal structure is subjected to external forces, which will further aggravate the growth of cracks. Therefore, these damages will induce the durability and safety hazards of concrete structures.
Concrete self-healing admixture is a self-healing admixture that is mixed into the concrete material at the beginning of the construction of the concrete structure. repair effect.
Mechanism of action
Self-healing admixtures can delay the early hydration degree of the cement slurry; when cracks appear, the self-healing hydration reaction of the mortar is started to repair and fill the cracks and gaps.
Since the self-healing admixture belongs to a variety of composite materials, it has the composite properties of a variety of materials, such as complexing properties, setting properties, water storage properties, plasticizing properties and compacting properties. Concrete itself has better self-healing properties, compactness, compressive strength, frost resistance and permeability resistance.
