A self-healing cement-based composite material

Abstract

The invention provides a self-repairing cement-based composite material. The composite material is characterized in that the composite material is prepared from the following materials by mass percent: 35 to 75 percent of cement, 5 to 35 percent of slag powder, 20 to 55 percent of active substance and 3 to 7 percent of water repellent. The preparation method of the active substance comprises the following steps: taking the following materials by mass percent: 1 percent of stearic acid, 59 percent of cement, 18 percent of anhydrite and 22 percent of calcium hydroxide, grinding the four materials into a mixture A with 4000 to 6000 meshes by a flour mill, completely bonding the stearic acid to the cement, the anhydrite and the calcium hydroxide, then adding the mixture A into a large cyclodextrin (LR-CD) saturated solution to fully stir, performing clathration on the cement, the anhydrite and the calcium hydroxide to dry by utilizing the hydrophobicity of the stearic acid and the lipophilic and hydrophobic properties of the inner cavity of the LR-CD. The self-repairing cement-based composite material provided by the invention has the advantages that the composite material has a self-repairing function on the crack on the concrete and reduces the occurrence rate of engineering accident.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a self-repairing cement-based composite material. Background technique [0002] In recent years, engineering accidents caused by the development of cracks have become quite common. It can be said that the wireless development of microscopic cracks is one of the root causes of engineering accidents. Therefore, the automatic repair of cement has always been the focus and research of the academic and engineering circles. hotspot. For surface macroscopic cracks, people often use passive repair methods such as grouting, caulking and concrete replacement. Some non-destructive testing techniques, such as ultrasonic reflection method, radiography, and infrared imaging, are often used to detect internal damage in concrete, but they all have certain limitations and cannot be monitored in real time, and their repair is even more difficult. Contents of the invention [0003] A...

AI Technical Summary

Problems solved by technology

Some non-destructive testing techniques, such as ultrasonic reflection method, radiography, infrared imaging, etc., are often used to detect internal damage of concrete, but they all have certain limitations and cannot be monitored in real time, and their repair is even more difficult