Admixture for improving mechanical properties of cement-based materials and preparation method of admixture

Abstract

The invention discloses an admixture for improving mechanical properties of cement-based materials. The admixture is aqueous dispersion of organic-inorganic hybrid particles, the organic-inorganic hybrid particles account for 5-40% of the aqueous dispersion, and each particle is in a two-layer structure including an inner layer and an outer layer. The inner layers comprise organic components and inorganic components, wherein no covalent bond exists between the organic components and the inorganic components, and the inorganic components and the organic components are respectively connected through covalent bonds to form a polymer network. Each outer layer is a layer of electronegative organic polyelectrolytes with long side chains. The admixture for improving the mechanical properties of the cement-based materials is beneficial to improvement of compressive strength of the cement-based materials, and the more the admixture is doped, the more evidently the mechanical properties of the cement-based materials are improved.

Description

technical field [0001] The invention relates to the field of admixtures used for modifying cement-based materials, in particular to an admixture capable of improving the mechanical properties of cement-based materials. Background technique [0002] Cement-based materials refer to materials such as concrete, mortar, and grouting. As the most widely used building material in the world, cement-based materials continue to expand their application fields, but complex and diverse construction and use environments continue to put forward higher requirements for their performance. Therefore, improving their mechanical properties is an inevitable trend of its development. [0003] Ordinary cement-based material is a typical brittle material, which has high compressive strength, but obviously insufficient bending and tensile strength. In actual use, it is easy to produce various cracks or damage due to stress concentration or uneven force, making The durability decreases, which limit...

AI Technical Summary

Problems solved by technology

[0016] Existing admixtures cannot fundamentally solve the problem of brittleness of cement-based materials, and even if the problem can be alleviated to a certain extent, the strength of cement-based materials will be lowered, or the preparation process of admixtures is complicated, or the cost is too high, and Various bugs where the app is limited, etc.

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