Concrete super-retarding agent

Abstract

The invention discloses a concrete super-retarding agent. The concrete super-retarding agent comprises components in parts by weight as follows: 15-20 parts of EDTMPA (ethylenediamine tetramethylenephosphonic acid), 10-15 parts of ATMP (amino trimethylene phosphonic acid), 15-20 parts of HPMC (hydroxyl propyl methyl cellulose), 10-15 parts of white sugar and 30-50 parts of water. The concrete super-retarding agent has the advantages that the mixing amount is only 0.3%-0.5% of the mass of a cementing material, but the retarding time can be prolonged to 80-100 h, the 28 d setting time is not shortened, but the later strength of concrete still reaches the standard, and compared with an ordinary retarding agent, the concrete super-retarding agent is low in product cost and realizes both economic and technical indicators.

Description

technical field [0001] The invention relates to a concrete retarder. Background technique [0002] With the continuous development of construction technology, concrete with various special requirements emerges as the times require. In some large-scale concrete projects, in order to ensure that the bored piles in the subsequent construction and the bored piles completed in the previous construction are interlocked into a whole, it is often required to extend the setting time of the concrete to 60-80 hours, but it cannot affect the concrete. ultimate strength. Obviously, ordinary retarders cannot meet this requirement. The market share of this kind of ultra-retarding concrete is gradually increasing. In today's shrinking civil construction market, research on concrete super-retarding agents has very realistic economic and technical values. [0003] Japan is the main country where there are more studies on super retarders, but not many are effectively used and sold in engine...

AI Technical Summary

Problems solved by technology

The purchase of its products is often expensive, which is not conducive to the control of construction costs