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《Nonferrous Metals Science and Engineering》 2017-05
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Impacts of different activators on the strength properties of SCM-Ⅰ furnace slag based cementing materials

HE Zhexiang;WEI Zhen;LI Xiang;XIAO Wei;Institute of Environment Engineering, School of Metallurgy and Environment, Central South University;Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution;  
With the cementing materials based on furnace slag used as main raw material, this study analyzed the effects of different kinds of activators on SCM-Ⅰ cementing materialsbased on furnace slag. The analysis of SEM and XRD, and perspectives of microscopic and hydration products were added to the study. The results show that alkali-activators like Ca(OH)_2, NaOH have certain activation effect. The addition of Ca(OH)_2 has increased the 28 d compressive strength of cementing materials by 34.77 %. Na_2SiO_3 has inhibitory effect on the strength when the mixing amount is 0.75 % and the strength has depressed by 45.15 %. The compressive strength increases 7.90 % when 0.50 % of Na_2SO_4 is added, which shows that the activation effect is insignificant. When 1.00 % of the mixing amount of chloride activators such as NaCl and CaCl_2 is added, the compressive strength increasesby 68.08 % and 5.62 % respectively. CaCl_2 promotes the hydration reaction and a lot of ettringite is formed. The addition of Na_2SiO_3 inhibits the formation of C-S-H gels, which declines the strength of the cementing materials
【Fund】: 国家“十二五”科技支撑计划项目(2012BAC09B02)
【CateGory Index】: TU528
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