Study on synthesis and application properties of a viscosity-reducing polycarboxylate water-reducer
TPEG-1200,AA,MAA,and VAc were used for quaternary copolymerization to synthesize a polycarboxylate water-reducer JN-1 with excellent viscosity reduction performance.Orthogonal experiments were used to investigate the effects of acid ether ratio,monomer and chain transfer agent dosage on the Marsh time of the slurry,in order to evaluate its viscosity reduction performance.The results showed that the optimal synthesis process for JN-1 is as follows:acid-ether ratio of 2.5,MAA dosage of 20％,VAc dosage of 1.0％,ME dosage of 1.0％.Compared to the ordinary polycarboxylate DJ-200 and the domestic viscosity-reducing water-reducer S901,JN-1 has better viscosity reducing performance and concrete workability,and its performance is similar to that of imported B415,without affecting the 28 d strength of concrete.
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