Polymer cement concrete additive and preparation method thereof

Abstract

The invention discloses a polymer cement concrete additive. The formula of the polymer cement concrete additive comprises, by mass, 5-15 parts of silica fume, 4-10 parts of inorganic nano-particles, 12-18 parts of hydroxyethyl cellulose, 8-12 parts of FRP fibers, 3-8 parts of PP (polypropylene) fibers, 6-14 parts of a polycarboxylate superplasticizer, 1-5 parts of a composite preservative and 0.5-1.5 parts of a workability regulator. The invention also discloses a preparation method of the polymer cement concrete additive. The additive improves the durability, the strength, the toughness and the corrosion resistance of cement concrete, can effectively improve the workability of the cement concrete to make the fresh cement concrete have good flowability, can effectively reduce the pore surface tension of the cement concrete and reduce the number of harmful macropores in the cement concrete to make the concrete have high compactness, and also has the advantages of improvement of the durability of the concrete, simple and reasonable preparation method steps, and easiness in industrial production.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a polymer cement concrete additive, and at the same time, the invention also relates to a preparation method of a polymer cement concrete additive. Background technique [0002] Cement concrete refers to artificial stone made of cement as the main cementitious material, mixed with water, sand, and stones, and chemical admixtures and mineral admixtures when necessary, mixed in an appropriate proportion, uniformly stirred, densely formed, and cured. . Cement concrete is mainly divided into two stages and states: the plastic state before setting and hardening, that is, fresh cement concrete or cement concrete mixture; the hard state after hardening, that is, hardened cement concrete. The strength grade of concrete is divided by the standard value of cubic compressive strength, and the strength grade of cement concrete is divided into 14 grades: C15, C20, C25, C30, C35, ...

AI Technical Summary

Problems solved by technology

Ordinary cement concrete has high compressive strength and high stiffness, but it has the characteristics of shrinkage cracking, low tensile strength and poor toughness during the setting and hardening process, and its brittleness becomes more obvious with the increase of strength. Greatly affects the durability of concrete structures

Cement concrete is placed in unsaturated air, and the internal capillary pores and gel pores lose absorbed water and undergo irreversible shrinkage, which will cause cracking of the concrete, resulting in a decrease in the durability of the concrete.

[0004] Based on the above reasons, most of the methods of adding admixtures are used to improve the performance of cement concrete. However, the commonly used cement concrete additives can only improve the performance of cement concrete to a limited extent. Most of them can only make the concrete have a single function and only have good corrosion resistance. , improve its strength, toughness or durability, etc., not comprehensive enough