Slow-release microcapsule concrete admixture and preparation method thereof

Abstract

The invention discloses a preparation method of a slow-release microcapsule concrete admixture. The method comprises the following processes: stirring and dispersing a porous carrier into a concrete admixture solution; fully soaking, centrifuging and filtering, and drying to obtain the slow-release microcapsule concrete admixture. When the porous carrier is fully soaked in the concrete admixture solution, one part of concrete admixture molecules enter the pores of the porous carrier and the other part of concrete admixture molecules are adsorbed on the surface of the carrier particle; the two parts of concrete admixture molecules are reserved in the porous carrier after being filtered an dried, so as to form the slow-release microcapsule concrete admixture. In addition, the invention also discloses a slow-release microcapsule concrete admixture. The concrete admixture can keep the flowing property of the concrete mixture, so that the slump of the concrete mixture is not lost within 5 hours, concrete segregation and bleeding are reduced, and the compactness, the strength and the durability of the concrete are improved.

Description

technical field [0001] The invention relates to a concrete admixture and a preparation method thereof, in particular to a slow-release microcapsule concrete admixture and a preparation method thereof. Background technique [0002] In the process of concrete preparation, a small amount of special product that can obviously improve the performance of concrete is added, called concrete admixture. Adding an appropriate amount of admixtures into concrete can improve concrete quality, improve concrete performance, reduce water consumption, save cement, reduce costs, and speed up construction progress. With the advancement of technology, admixtures have become the fifth necessary material besides cement, sand, stone and water. Adding admixtures is an important measure to optimize the design of concrete mix ratio and improve the durability of concrete. [0003] Water reducer is the most widely used and the largest amount of admixture in concrete admixture. Compared with tradition...

AI Technical Summary

Problems solved by technology

However, polycarboxylate-based high-performance water-reducers have also encountered many technical difficulties in practical applications, such as sensitivity to cement, admixtures, and especially soil materials in sand and gravel, etc. loss of performance

[0005] Because the time required for the concrete to be pumped and poured from the finished mixing factory to the construction site is sometimes too long, the slump loss of the concrete is very large, which makes pouring difficult

In order to meet the pumping requirements, the practice of adding admixtures and water to the concrete mixture is often used to improve the fluidity of the concrete when unloading. This dangerous practice has a serious impact on the quality of the concrete structure and brings hidden dangers to the project. , and even cause serious quality and safety accidents

Slump loss has always been a major problem in the concrete industry. How to effectively control slump loss is a major problem that must be solved in the further promotion and application of high-efficiency water-reducing agents and the development of new concrete technologies. Ordinary retarding water-reducing agents often give concrete Problems caused by water and chemical reactions affect the overall performance of concrete