PREPARATION METHOD FOR POLYCARBOXYLIC ACID ADMIXTURE FOR USE IN MACHINE-MADE SAND CONCRETE

摘要

A preparation method for a polycarboxylic acid admixture for use in a machine-made sand concrete, comprising the following steps: (1) preparing a mud-resistant polycarboxylic acid water reducer masterbatch with ethylene-glycol monovinyl polyethylene glycol (EPEG) monomers serving as primary reaction units, and (2) proportionally compounding at room temperature the mud-resistant polycarboxylic acid water reducer masterbatch, a polyether organophosphate, a foam control agent, a concrete viscosity modifier, and water to produce the polycarboxylic acid admixture for use in the machine-made sand concrete. The polycarboxylic acid admixture for use in the machine-made sand concrete has a high water reduction rate, has strong material adaptability, provides enhanced capability in controlling slump loss, and has the effect of suppressing large bubbles in the concrete and improving the workability of the concrete, and, with respect to the machine-made sand concrete that is gap-graded and has a high rock powder content (6-12%), provides the effect of significantly improving workability and enhancing strength.