Micromolecular concrete retarder and preparation method thereof

Abstract

The invention provides a micromolecular concrete retarder. The chemical structure of the micromolecular concrete retarder is shown as a formula (I) or a formula (II). The micromolecular concrete retarder has strong metal complexing ability, can delay hydration reaction of mineral substances in cement, and can be used for prolonging initial setting time and final setting time of cement paste, mortar and concrete. The micromolecular concrete retarder disclosed by the invention has the advantages of difficult decay, long shelf life, obvious retarding effect and good weather resistance when beingapplied to concrete in a small mixing amount; the micromolecular concrete retarder provided by the invention has excellent compatibility with a water reducing agent product, and can also improve the slump loss resistance of concrete during working.

Description

technical field

[0001] The invention relates to the field of concrete additives, in particular to a small molecule concrete retarder and a preparation method thereof. Background technique

[0002] Concrete retarders regulate the setting time of concrete by delaying the hydration rate of cement. The initial and final setting time of concrete can be adjusted by using the appropriate retarder and dosage, so that the fresh concrete can maintain plasticity for a long time, realize long-distance concrete transportation, and meet the needs of concrete with special setting time. During construction in winter and summer, concrete will cause cracks due to temperature differences. In addition, in the process of mass concrete construction, the temperature difference caused by hydration heat may also cause cracks after concrete hardening. By adding Retarder can prevent cement concrete from cracking due to temperature difference. Therefore, retarder is an essential concrete admixture. ...

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