| abstract |
The invention discloses a kind of concrete retarders, are made of each component of following weight：2~4 parts of Boratex, 3~7 parts of potassium dihydrogen phosphate, 4~8 parts of calcium sulfate, 6~8 parts of 1-hydroxy ethylidene-1,1-diphosphonic acid, 3~5 parts of disodium ethylene diamine tetraacetate, 1~4 part of D-sorbite, 25~30 parts of bentonite, 10~15 parts of vermiculite power, 4~6 parts of water-reducing agent, 1~3 part of dispersant, 0.4~0.8 part of surfactant.The present invention has many advantages, such as that retarding effect is good, intensity is high and pollution-free, is a kind of rising concrete admixture. |