Journal of Northeastern University Natural Science ›› 2020, Vol. 41 ›› Issue (4): 581-586.DOI: 10.12068/j.issn.1005-3026.2020.04.022

• Resources & Civil Engineering • Previous Articles     Next Articles

Synergies in Early Hydration Reaction of Slag-Steel Slag-Gypsum System

LI Ying1, WU Bao-hua2, NI Wen1, MU Xin-li1   

  1. 1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Handan Iron & Steel Co., Ltd., HBIS Group Co., Ltd., Handan 056015,China.
  • Received:2019-09-23 Revised:2019-09-23 Online:2020-04-15 Published:2020-04-17
  • Contact: NI Wen
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Abstract: The reaction process of slag-steel slag-gypsum system in early stage of hydration was studied with a focus on the types, production time, relative production and micromorphology of early hydration products under the single variable conditions. The results showed that both gypsum and steel slag can stimulate the hydration of slag. In early hydration process of slag-steel slag-gypsum cementitious material system, the synergies of slag, steel slag and gypsum can be driven by the formation of ettringite, and the main hydration products are ettringite and C-S-H gel. The very early hydration rate of steel slag and mixture of steel slag and gypsum is fast, which has great significance to adjusting the setting time of slag-steel slag-gypsum cementitious material system.

Key words: hydration, activation effect, ettringite, C-S-H gel, synergy

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