Composite concrete retarder and preparation method thereof

Abstract

The invention discloses a composite concrete retarder and a preparation method thereof, and the composite concrete retarder is prepared from the following components in parts by weight: 50-70 parts of a retarding water reducer, 5-10 parts of a terpolymer retarder, 10-12 parts of an organic phosphonic acid substance, 10-15 parts of an inorganic phosphoric acid substance, and 1-3 parts of saccharides. The retarding type water reducer is prepared from the following components in parts by weight: 90 to 120 parts of unsaturated polyether macromonomers, 4 to 6 parts of unsaturated phosphonate monomers, 7 to 13 parts of unsaturated carboxylic acid micromonomers, 0.4 to 1.2 parts of an initiator, 0.1 to 0.4 part of a reducing agent, 0.3 to 0.6 part of a chain transfer agent and alkali liquor; the terpolymer retarder is prepared from the following components in parts by weight: 15-20 parts of unsaturated carboxylic acid small monomers, 15-20 parts of unsaturated acid anhydride, 25-30 parts of unsaturated ester small monomers, 0.6-1.5 parts of an initiator and 0.1-0.4 part of a chain transfer agent. The composite concrete retarder is high in water-reducing rate, high in retarding performance and strong in adaptability, and the compressive strength of concrete in the later period is not lost.

Description

technical field [0001] The invention relates to the technical field of concrete retarders, in particular to a composite concrete retarder and a preparation method thereof. Background technique [0002] With the rapid development of modern industry, the amount of concrete is constantly increasing, and the requirements of builders for concrete admixtures are also increasing. Especially in summer, when the temperature is high, the setting time of concrete will be shortened rapidly, thus losing fluidity and causing inconvenience to the constructor. In pouring mass concrete, in order to reduce the construction accident of cracks in concrete due to the temperature stress generated by hydration heat release, it is necessary to prolong the setting time of concrete. As a common concrete admixture, retarder can affect the hydration reaction time of cement, thereby reducing slump loss, maintaining the fluidity of concrete and prolonging the setting time of concrete. In addition, addi...

AI Technical Summary

Problems solved by technology

These substances all have a certain retarding effect, but the retarding effect of adding a single substance is not good, and cannot meet the high requirements of modern industry, and due to the different adsorption capabilities of the materials, the retarder is different from different types of cement and water reducing agents. Poor compatibility of additives, mineral admixtures, etc., which limits the use of a single retarder in the development of concrete

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