氨基磺酸系高效减水剂对水泥的分散作用研究

Study of Dispersion Effect of Sulfamic Acid Series Superplasticizer on Cement

研究了氨基磺酸系新型高效减水剂ASP对水泥净浆的分散作用机理。对照商品萘系高效减水剂FDN ,研究了掺加减水剂后水泥胶粒的 ζ电位及水泥颗粒对减水剂的吸附量。结果表明 ,掺加ASP和FDN后水泥颗粒的 ζ电位基本相同 ,而ASP在水泥颗粒的吸附量较FDN的小 。

The mechanism of dispersion effect of sulfamic acid series ASP on cement particles was studied.Measurement of adsorption amount and ζ potential showed that for cement particles added with FDN or ASP the surface ζ potentials were similar,while the adsorption amount of ASP on the surface of cement particles was smaller than that of FDN.All these results suggest that the dispersion of cement particles,responsible for the fluidity increase caused by ASP,is related to both the electrostatic repulsion and the stereo hindrance.