Composite additive for enhancing self-repairing property of cement-based material and preparation method thereof

Abstract

The invention provides a composite additive for enhancing the self-repairing property of a cement-based material. The composite additive is prepared from the following components in percent by weight:5%-10% of free calcium-oxide powder, 10%-20% of calcium stearate, 40%-74% of calcium-oxide powder, 10%-20% of fumaric acid and 1%-10% of lithium silicate powder. The composite additive for enhancingthe self-repairing property of the cement-based material has the advantage that the self-repairing property of the cement-based material can be improved and enhanced.

Description

technical field [0001] The invention belongs to the field of admixtures, and in particular relates to a composite additive for enhancing the self-repairing performance of cement-based materials and a preparation method thereof. Background technique [0002] As the most widely used material in construction engineering, cement-based materials have a series of advantages such as low cost and excellent mechanical properties. However, the characteristics of high elastic modulus and poor toughness of cement-based materials lead to easy occurrence of Fatigue damage and small cracks affect its durability and reduce its service life. In order to improve the performance of concrete materials, a series of admixtures such as water reducing agents, early strength agents, and setting retarders have appeared successively. However, these technical means cannot completely solve the problem of poor toughness of cement-based materials and easy cracks under the influence of external factors. d...

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Problems solved by technology

[0002] As the most widely used material in construction engineering, cement-based materials have a series of advantages such as low cost and excellent mechanical properties. However, the characteristics of high elastic modulus and poor toughness of cement-based materials lead to easy occurrence of Fatigue damage and small cracks affect its durability and reduce its service life

In order to improve the performance of concrete materials, a series of admixtures such as water reducing agents, early strength agents, and setting retarders have appeared successively. However, these technical means cannot completely solve the problem of poor toughness of cement-based materials and easy cracks under the influence of external factors. defect

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