Influence of a C{sub 12}A{sub 7} mineral-based accelerator on the strength and durability of shotcrete
- Samsung Corporation Engineering and Construction Group, Sungnam (Korea, Republic of)
- Department of Civil and Environmental System Engineering, Konkuk University, Seoul (Korea, Republic of)
- Department of Rural Construction Engineering, Kongju National University, Yesan (Korea, Republic of)
This study analyzed the long-term strength and durability of shotcrete when a C{sub 12}A{sub 7}-based accelerator is added to the mixture. Since an accelerator with a high alkali content causes a remarkable decrease in the long-term strength of shotcrete and is toxic to humans, this study evaluated the setting time, compressive strength, and resistance to permeability and repeated freeze-thaw cycles of an amorphous C{sub 12}A{sub 7}-based accelerator. The results showed that the C{sub 12}A{sub 7} accelerator set quickly by forming a web structure from its initial setting state due to the presence of ettringite. In addition, the ettringite, with its characteristic acicular crystals, proved resistant to permeability and repeated freeze-thaw cycles. Ettringite has a structure that encouraged a smooth hydration reaction, maintaining the voids at the surface of the cement particles and resulting in the observed initial strength and decrease in the reduction of the long-term strength.
- OSTI ID:
- 21033071
- Journal Information:
- Cement and Concrete Research, Vol. 38, Issue 3; Other Information: DOI: 10.1016/j.cemconres.2007.09.016; PII: S0008-8846(07)00233-5; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
- Country of Publication:
- United States
- Language:
- English
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