A Study on the Activation of Carbide Slag Cementitious Materials

DOI

10.2991/coal-18.2018.44How to use a DOI?

Keywords

filling material, orthogonal testing, hydration mechanism, microscopic analysis

Abstract

This research used orthogonal testing methods to study the effect of stimulator content on the properties of carbide slag (CS) cementitious materials. Range and variance analyses reveal that different stimulators do not significantly affect the consistencies and setting times of these cementitious materials, but influenced considerably their flexural and compressive strengths; the influence decreases in the order: NaOH> CaCl2> Na2SO4> Na2SiO3. Further analyses show that the strengths of these cementitious materials increase with increasing NaOH content, and decrease with increasing CaCl2 content. When the mass ratio of Na2SO4: Na2SiO3: CaCl2: NaOH was 1: 1: 0: 5, the stimulators exhibited the best activating effect. X-ray diffraction (XRD) and Scanning electron microscope (SEM) analyses showed that the 28-day hydration products contain large amounts of ettringite (AFt), calcium silicate hydrate (C-S-H), calcium aluminate hydrate (C-A-H), and small amounts of unreacted Ca(OH)2 and quartz. These hydration products increased the strengths of these cementitious systems.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Mingyue Wu
AU  - Xiangming Hu
AU  - Qian Zhang
AU  - Weimin Cheng
AU  - Lin Xin
AU  - Yanyun Zhao
PY  - 2018/10
DA  - 2018/10
TI  - A Study on the Activation of Carbide Slag Cementitious Materials
BT  - Proceedings of the 9th China-Russia Symposium "Coal in the 21st Century: Mining, Intelligent Equipment and Environment Protection" (COAL 2018)
PB  - Atlantis Press
SP  - 235
EP  - 242
SN  - 2352-5401
UR  - https://doi.org/10.2991/coal-18.2018.44
DO  - 10.2991/coal-18.2018.44
ID  - Wu2018/10
ER  -