Effect of Sodium Gluconate on Hydration Process of Calcium Sulfoaluminate Cement
LIAO Yishun1,2,3,*, WANG Sichun1, LIAO Guosheng1,2,3, MEI Junpeng1,2,3, CHEN Yingxue1
1 School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China 2 Hubei Provincial Engineering Research Center of Urban Regeneration, Wuhan 430065, China 3 Institute of High Performance Engineering Structure, Wuhan University of Science and Technology, Wuhan 430065, China
Abstract: The effects of sodium gluconate (SG) on the setting time, compressive strength, heat of hydration, electrical resistivity, internal temperature, and hydration products of calcium sulfoaluminate cement (CSA) pastes were investigated. The results indicate that SG can prolong the setting time of cement pastes, delay the development of heat of hydration and electrical resistivity, decrease the compressive strength at 12 h, but increase the strength at 28 d. The heat of hydration and electrical resistivity during early hydration decreased with the increase of SG from 0% to 0.15%, which indicated that the cement hydration was delayed. Both the electrical resistivity at 24 h and the heat of hydration at 3 d were decreased significantly when the dosage of SG reached 0.2%. The addition of SG can promote the hydration of β-C2S, but decrease the thermal stability of ettringite at 12 h.
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