| Summary: | 碩士 === 國立臺灣師範大學 === 化學系 === 93 === Superplasticizer can improve the workability of concrete. In this research, the DAAE monomer was prepared from 2-(Dimethylamino) ethyl acrylate and sodium chloroacetate. The copolymer (PAMD) was prepared from 2-acrylamido-2-methylpropane sulfonic acid (AMPSA), methacrylic acid (MAA), and the monomers (DAAE) by free-radical polymerization. The prepared monomer (DAAE) and PAMD were confirmed by FT-IR and 1H-NMR spectra. The monomer ratio of copolymer was determined by the potentiometric titration method. The effects of the monomer ratio, and molecular weight of copolymer on the fluidity of cement pastes were investigated﹔The results was explained by the adsorption behavior of copolymer on the cement particles and zeta potential.
The results indicate that the cement pastes containing PAMD ( AMPSA / MAA /DAAE = 6 / 10 / 1, Mw=1.1×105) shows the highest mini-slump and the best mini-slump retention, the saturation dosage was about 0.2 wt%, and the result were better than those of HP100 (carboxylate-based) and HPC1000 (sulfonate-based).
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