Cement concrete composite ultra retarder

Abstract

This invention relates to a compound super-retarder of cement, which takes industrial phosphate and PBTC as the raw materials and produces it according to an ordinary method, which can be mixed with different cements and increases post strength and durability of concrete, so it's used in summer installation, concrete needing adjusting operation time and large volume of concrete pouring or mixing pre-mixed mortar.

Description

Technical field: [0001] The invention belongs to the technical field of cement concrete, and particularly relates to an admixture for cement concrete. Background technique: [0002] The retarder is an admixture used to extend the setting time of cement concrete without destroying the performance of the concrete and affecting the later strength of the concrete. It can keep the fresh concrete plastic for a long time for pouring and improve the construction efficiency. It has been obtained in modern concrete technology. widely used. Moreover, high-performance retarders are key materials for summer construction and mass concrete construction. In addition to delaying the setting time of concrete, it is also required not to affect the strength of concrete and cause abnormal condensation. At present, the commonly used retarders are mainly divided into organic and inorganic types. Organic types mainly include hydroxycarboxylic acids and their salts, sugars and carbohydrates, lignosulfona...

AI Technical Summary

Problems solved by technology

But some deficiencies that all exist in these retarders are: the dosage of organic retarders is small, the setting time is long, but the range of the dosage is small, and the setting time fluctuates greatly with the variation of the dosage. When the dosage exceeds a certain value, the concrete There will be problems such as abnormal condensation and strength decline; inorganic retarders, with large dosage and increasing with the dosage, have little effect on concrete setting time, but can greatly reduce concrete strength and other problems

[0006] 1. It has been proved by experiments that the above two super retarders did not increase the strength of concrete in the later stage

[0007] 2. The price of ethylene polyamine alkyl phosphonic acid is relatively high, and its use in European and American countries has been restricted. The admixture in the above formula is large, and the economic benefit is not high

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