Strengthening the hydration process of steel slag/granulated blast furnace slag/barium slag cementitious materials
ZHANG Yu-ting1, ZHENG Qi1, PAN Shi-wen2, HAN Yong-hui2,3, ZHAO Feng-qing1,3
1. School of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China; 2. School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China; 3. Hebei Technology Innovation Centre of Solid Wastes Utilization, Shijiazhuang 050018, Hebei, China
Abstract：With regard to the slow hydration and hardening of steel slag/granulatedblast furnace slag/barium slag(SS/GBFS/BS) cementitious materials, a method of chemical activation composite with seed crystal strengthening was proposed to accelerate the hydration and hardening process. The ratio of activator gotten by orthogonal experiment was calcined desulfurized gypsum 11%, calcium aluminate 3%, and sodium sulfate 0.75%. The composite seed crystal prepared by rapid pre-hydration of SS/GBFS/BS cementitous material containing the activator could further promote the hydration and crystallization process of cementitous material, improve the early strength and low-temperature application performance. When the dosage of composite seed crystal was 4%, the 3 d and 28 d compressive strength values of cementitious material increased from 25.5 and 39.1 MPa to 29.8 and 42.5 MPa, respectively. The hydration products of cementitous material were analyzed by XRD, FT-IR and SEM. It showed that the hydration products mainly included ettringite (AFt), hydrated calcium silicate (C-S-H) and hydrated calcium aluminate (C-A-H), etc. The use of seed crystal promoted the formation of AFt and C-S-H, especially the former.
Kanchanason V, Plank J. Effectiveness of a calcium silicate hydrate-polycarboxylate ether (C-S-H-PCE) nanocomposite on early strength development of fly ash cement[J]. Construction and Building Materials, 2018, 169:20
YAN P, QIN X, YANG W, et al. The semiquantitative determination and morphology of ettringite in pastes containing expansive agent cured in elevated temperature[J]. Cement and Concrete Research, 2001, 31(9):1285.
2022, Vol. 32 
