Synthesis of super plasticizer NF-30 from coal coking by product washing oil and performance analysis

Abstract

Super plasticizer was synthesized by using coal coking by product washing oil and industrial naphthalene. The results show that sulfonationt time (2.5 h), sulfonation temperature (160 °C) and condensation time (5.0 h) are key factors. Adding oxidizing agent MO in the course of synthesis can decrease the emission of SO₂ in exhaust (20%). Compared with NF, NF-30 have some advantages in lower cost, high water reducing rate (19.7%) and optimum early strengths. Moreover, TGA-DTA and SEM analysis were adopted to research the NF-30 modified concrete on hydyation mechanism. The analysis show that, compared with NF, there are a large number of hydration products such as Ca (OH)₂, C-S-H, AFt etc of NF-30, the structure of NF-30 is dense and the performance is good.

Keywords

washing oil / super plasticizer / TGA-DTA-thermo analysis / SEM-scan analysis

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