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

A technology of composite additives and reinforced cement, which is applied in the field of admixtures and can solve the problems of reduced service life, fatigue damage, small cracks, and impact on durability.

Active Publication Date: 2018-07-13
TIANJIN BUILDING MATERIALS SCI RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0030] The cement-based mortar materials in Examples 1 to 6 are all prepared from the following raw materials at room temperature: 300g of P.O42.5 ordinary Portland cement, 1370g of continuous graded river sand below 4.75mm, 300g of S95 grade mineral powder, 30g of composite additives to enhance the self-healing performance of cement-based materials, and the amount of water added is 300g;

Embodiment 1

[0032] The composite additive of strengthening cement-based material self-healing performance in embodiment 1 comprises the following components by weight percentage: free calcium oxide powder 5%, calcium stearate 10%, calcium oxide powder 74%, fumaric acid 10% , Lithium silicate powder 1%.

Embodiment 2

[0033] The composite additive of strengthening cement-based material self-healing performance in embodiment 2 comprises the following components by weight percentage: free calcium oxide powder 6%, calcium stearate 12%, calcium oxide powder 67%, fumaric acid 12% , Lithium silicate powder 3%.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/08C04B28/04
CPCC04B28/04C04B40/0039C04B2201/50C04B22/064C04B24/085C04B24/04C04B12/04C04B14/06C04B18/12C04B2103/302C04B2103/0045C04B2103/0068C04B24/026
Inventor 陈佳宁刘凤东王冬梅李赵相张秋菊滕藤王建恒
Owner TIANJIN BUILDING MATERIALS SCI RES INST
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