Some microstructure properties at early age of ettringite binder based on rich C12A7 calcium aluminate cement
The mineral composition of calcium aluminate cements is traditionally based on CA (monocalcium aluminate-CaO·Al2O3). Recently, a new cement with the main compound of C12A7 (Mayenite) has been developed for rapid hardening binder. This cement is used in conjunction with a sulfate binder to form a new type binder called ettringite binder due to the high quantity of ettringite in the hydration product, opened new possibilities for mortar and concrete formulations. This paper focuses on some microstructure characteristics of the ettringite binder based on a C12A7 rich cement and a hemihydrate at early age. Some important characteristics of this binder were found, such as: short setting time (about 40–50 minutes), rapid expansion just after initial setting time, rapid evolution of porosity and bound water during the first 5 hours of hydration. The correlation between bound water and porosity of hardened binders was also found in this paper.
Article history: Received 24 January 2018, Revised 04 April 2018, Accepted 27 April 2018
World Bank (2016). Vietnam 2016: Rapid flood damage and needs assessment. World Bank report.
Texas Department of Transportation (2004). Standard specifications for construction and maintenance of highways, streets, and bridges.
Bizzozero, J. and Scrivener, K. L. (2014). Hydration and microstructure of rapid-strength binders based on OPC accelerated by early ettringite formation. In Proceedings of the International Conference on Calcium Aluminates, Avignon, France.
Fryda, H., Berger, S., Bordet, F., Andreani, P. A., Martinet, A., and Brigandat, P. (2014). Ultrafast hydration opening new application fields: a comparison of di_erent calcium aluminate technologies. In Proceedings of the International Conference on Calcium Aluminates, Avignon, France.
Onishi, K. and Bier, T. A. (2010). Investigation into relations among technological properties, hydration kinetics and early age hydration of self-leveling underlayments. Cement and Concrete Research, 40(7):1034–1040.
Le Bihan, T. (2010). Etude du comportement des chapes autonivelantes en ciment sulfo-alumineux: outils exp´erimentaux et de mod´elisation. PhD thesis, INSA Lyon, 2010, in French.
Klaus, S. R., Neubauer, J., and Goetz-Neunhoe_er, F. (2013). Hydration kinetics of CA2 and CA–investigations performed on a synthetic calcium aluminate cement. Cement and Concrete Research, 43:62–69.
Damidot, D., Rettel, A., and Capmas, A. (1996). Action of admixtures on fondu cement: Part 1. Lithium and sodium salts compared. Advances in Cement Research, 8(31):111–119.
Damidot, D., Rettel, A., Sorrentino, D., and Capmas, A. (1997). Action of admixtures on fondu cement: II. E_ect of lithium salts on the anomalous setting time observed for temperatures ranging from 18 to 35°C. Advances in Cement Research, 9(35):127–134.
Martin, I., Patapy, C., and Cyr, M. (2014). Parametric study of binary and ternary ettringite-based systems. In Proceedings of the International Conference on Calcium Aluminates, Avignon, France.
Scrivener, K. L. and Capmas, A. (1998). LEA’s Chemistry of Cement and Concrete, chapter 13: Calcium Aluminate Cements. Elsevier Science & Technology Books - London.
Le Saout, G., Lothenbach, B., Taquet, P., Fryda, H., and Winnefeld, F. (2014). Hydration study of a calcium aluminate cement blended with anhydrite. In Proceedings of the International Conference on Calcium Aluminates, Avignon, France.
Andreani, P. and Touzo, B. (2014). Mineral composition and hydration of a C12A7 rich binder. In Proceedings of the International Conference on Calcium Aluminates, Avignon, France.
Lamberet, S. (2005). Durability of ternary binders based on Portland cement, calcium aluminate cement and calcium sulfate. PhD thesis, Ecole Polytechnique Federale de Lausanne, Switzerland.
Georgin, J. F. and Prud’homme, E. (2015). Hydration modelling of an ettringite-based binder. Cement and Concrete Research, 76:51–61.
Bayoux, J., Bonin, A., Marcdargent, S., Verschaeve, M., and Mangabhai, R. J. (1990). Study of the hydration properties of aluminous cement and calcium sulphate mixes. Calcium aluminate cements - E. & F. N. Spon, Chapman & Hall, London.
Lura, P. and Jensen, O. M. (2007). Measuring techniques for autogenous strain of cement paste. Materials and Structures, 40(4):431–440.
1. The Author assigns all copyright in and to the article (the Work) to the Journal of Science and Technology in Civil Engineering (STCE Journal) – National University of Civil Engineering (NUCE), including the right to publish, republish, transmit, sell and distribute the Work in whole or in part in electronic and print editions of the Journal, in all media of expression now known or later developed.
2. By this assignment of copyright to the STCE Journal, reproduction, posting, transmission, distribution or other use of the Work in whole or in part in any medium by the Author requires a full citation to the Journal, suitable in form and content as follows: title of article, authors’ names, journal title, volume, issue, year, copyright owner as specified in the Journal, DOI number. Links to the final article published on the website of the Journal are encouraged.
3. The Author and the company/employer agree that any and all copies of the final published version of the Work or any part thereof distributed or posted by them in print or electronic format as permitted herein will include the notice of copyright as stipulated in the Journal and a full citation to the Journal as published on the website.