Winter low-temperature dry-mixed mortar admixture taking limestone flour as admixture

Abstract

The invention discloses a winter low-temperature dry-mixed mortar admixture taking limestone flour as an admixture. The admixture comprises the following materials in percentage by weight: 20-30% of cellulose ether, 8-10% of starch ether, 10-15% of maltodextrin, 5-10% of a thixotropic lubricant, 4-8% of a water reducing agent, 3-5% of an air entraining agent, 10-20% of a redispersible polymer rubber powder and 20-30% of bentonite. According to the admixture disclosed by the invention, excellent water retaining property of a mortar mixture is provided, and the problem that the mortar mixture has too long setting time due to cellulose ether in a winter low-temperature environment can be solved; due to the compound use of the starch ether, the thixotropic lubricant and the air entraining agent, plasticity of the mortar mixture can be ensured under high apparent density; according to the redispersible polymer rubber powder, the adhesive property, flexibility and deformation capacity of themortar on the base material can be obviously improved, so that problems such as hollowing, cracking and surface dusting after mortar hardening are improved.

Description

technical field [0001] The invention relates to a winter low-temperature dry-mixed mortar admixture using limestone powder as an admixture. Background technique [0002] my country is currently in the peak period of infrastructure construction. Ready-mixed mortar is a new type of building material developed in my country in recent years. It can be divided into dry-mixed mortar and wet-mixed mortar. Its advantages are health and environmental protection, stable quality, energy saving and comfort, etc. Many Cities are also gradually prohibiting on-site mixing of mortar, which has accelerated the promotion and use of ready-mixed mortar. Studies in recent years have confirmed that limestone powder can be used as a mineral admixture in dry-mixed mortar, which can effectively alleviate the shortage of fly ash supply, but there are still defects in actual engineering applications. For example, when limestone powder is mixed into dry-mixed mortar, the mortar mixture tends to be stic...

AI Technical Summary

Problems solved by technology

For example, when limestone powder is mixed into dry-mixed mortar, the mortar mixture tends to be sticky, which seriously affects the construction performance of the mortar mixture; at the same time, limestone powder mixed into dry-mixed mortar will reduce the compressive strength and bond strength of the mortar. , resulting in problems of hollowing, cracking and sanding on the surface after the mortar hardens, which is more obvious in the low temperature environment in winter