Method for enhancing performances of foam concrete by using PVDF (Polyvinylidene Fluoride) dispersion liquid

Abstract

The invention relates to the technical field of building materials, and aims to provide a method for enhancing the performances of foam concrete by using PVDF (Polyvinylidene Fluoride) dispersion liquid. The method comprises the following steps: immersing the foam concrete to the PVDF dispersion liquid, soaking for 10 to 30 minutes and then taking out, and then sintering. The solid content of the PVDF dispersion liquid is less than or equal to 10 percent, and the grain diameter of the PVDF is less than or equal to 1 mu m. According to the method disclosed by the invention, the foam concrete is subjected to enhancement processing by using strong hydrophobic property of the PVDF, and then subjected to processes, such as soaking and sintering, such that the water absorptivity of the foam concrete can be effectively reduced, the saturated water absorptivity of the treated foam concrete is reduced by 50 to 90 percent compared with that of untreated foam concrete, and therefore the heat preservation property, the frost resistance property and the construction property of the foam concrete in the use process are improved. Compared with a conventional technology in which a water repellent is added in a preparation process of the foam concrete, the method cannot produce adverse affects on the performances, such as the compressive strength and the dry density of the foam concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for enhancing the performance of foamed concrete by using a PVDF dispersion. Background technique [0002] Foam concrete has the advantages of light weight, heat insulation, fire prevention, convenient construction, good environmental protection, etc., and is widely used in projects such as building exterior wall insulation and fire protection belts. However, due to its high water absorption rate, it is easy to lead to an increase in thermal conductivity, a decrease in thermal insulation performance, and cracking and hollowing when the surface is plastered with mortar. Therefore, it is necessary to perform hydrophobic treatment on foamed concrete. [0003] At present, the main method used to improve the hydrophobicity of foamed concrete is to add a hydrophobic agent during the preparation of the foamed concrete, but it will have an adverse effect o...

AI Technical Summary

Problems solved by technology

However, due to its high water absorption rate, it is easy to lead to an increase in thermal conductivity, a decrease in thermal insulation performance, and cracking and hollowing when the surface is plastered with mortar. Therefore, it is necessary to carry out hydrophobic treatment on foam concrete

[0003] At present, the main method used to improve the hydrophobicity of foamed concrete is to add a hydrophobic agent during the preparation of the foamed concrete, but it will have an adverse effect on the properties of the foamed concrete such as compressive strength and dry density, and the increase in the hydrophobicity is not very good. obvious