Study on Synthesis of Slumpmaintaining and Shrinkagereducing Type Polycarboxylate Superplasticizer Utilizing the Method of Bulk Polymerization

Abstract:

In this paper, the polycarboxylate superplasticizers (PCE) were synthesized with allyl polyethylene glycol (APEG) and maleic anhydride diethylene glycol butyl ether monoester (MADGBE) as main raw materials using the method of bulk polymerization. And the influence of the ratio of monomer, the polymerization temperature and the mode of adding polymerization initiator on the performance of polycarboxylate superplasticizers were investigated. The results showed that the synthesized PCE, under the optimum polymerization conditions: the ratio of MADGBE and APEG is 3.5∶1, the polymerization temperature is 90 ℃ and the polymerization initiator is added in three times equally, performs excellent slumpmaintaining and shrinkagereducing. But the PCE extended the setting time of concrete. At the last, the molecular structure of the PCE was characterized using Fourier transform infrared spectromet (FTIR) analysis.