Carbon nanotube/polyvinyl alcohol high-tenacity intelligent cement mortar and preparation thereof

Abstract

The invention relates to a carbon nanotube / polyvinyl alcohol high-tenacity intelligent cement mortar and preparation thereof. The carbon nanotube / polyvinyl alcohol high-tenacity intelligent cement mortar is prepared from, by weight, 0.3-0.7 part of carbon nanotubes, 9-18 parts of a polyvinyl alcohol colloidal solution, 80-120 parts of portland cement, 120-180 parts of sand, 25-32 parts of water and 0.1-0.2 part of a defoaming agent. The preparation process includes the steps that firstly, the polyvinyl alcohol colloidal solution is prepared; then, the carbon nanotubes are uniformly dispersed into the polyvinyl alcohol colloidal solution; then, a prepared carbon nanotube / polyvinyl alcohol prepolymerized solution is mixed into cement mortar as a compound modifier, and the carbon nanotube / polyvinyl alcohol compound modified mortar is obtained through the four procedures of stirring, vibrating, forming and curing. According to the cement mortar, in-situ polymerization of the carbon nanotubes and polyvinyl alcohol is achieved, the reinforcing effect of the carbon nanotubes and polyvinyl alcohol in a cement-based material is fully exerted, the cement mortar has unique advantages in mechanical properties, especially, fracture toughness, and the stress change in a base material can be reflected through the internal resistance change.

Description

technical field [0001] The invention relates to a novel cement mortar, in particular to a carbon nanotube / polyvinyl alcohol high-toughness intelligent cement mortar and its preparation. Background technique [0002] Cement mortar is a very important engineering material in the field of civil engineering. With the rapid development of modern science and technology, people's requirements for the performance of cement mortar are increasing. The traditional cement mortar has the disadvantages of low tensile strength, high brittleness and single function, which has been difficult to meet the requirements of modern production and life. Therefore, modern cement mortar needs to gradually develop in the direction of high performance and multi-function. Modified cement mortar is a composite material composed of Portland cement and sand as the matrix material, polymer materials, fiber materials, nano-carbon fillers, etc., and chemical additives and water are added through a specific pr...

AI Technical Summary

Problems solved by technology

Polymer modified cement mortar has its advantages in mechanical properties, acid and alkali corrosion resistance, etc., but it is difficult to meet the functional requirements required by modern science (such as stress monitoring, photoelectric induction, electromagnetic shielding, etc.); It has its advantages in deformation performance, toughness, wear resistance, etc., but the application of fiber materials in cement mortar has disadvantages such as high viscosity, low pumpability, and difficult to lighten; It has certain advantages in toughening and other aspects, and also presents certain intelligent self-sensing characteristics, but carbon materials are prone to agglomeration and agglomeration in cement mortar, resulting in unstable reinforcement effects and high dispersion; the above-mentioned existing Although modified cement mortar has its own advantages in terms of mechanical properties, durability, and self-perception, it has its own limitations, and it is difficult to meet the high performance, multi-functional, and intelligent requirements required by some modern cement concrete structures.