SET Proceedings 2978-4387 Caravel Press 10.65582/set.2008.147 2008.147 Effect of Blain Fineness of Slag on the Compressive Strength Development of Alkali-Activated Slag Mortars YangKeun-Hyeok OhSeung-Jin SongJin-Kyu Mokpo National University, Chonnam, South Korea Chonnam National University, Gwangju, South Korea 24082008 7 1 978-1-995850-08-5 1097 1102 24 August 2008 © 2008 Copyright WSSET 2008

Ten cementless slag-based mortars activated by combination of sodium silicate and sodium hydroxide powders were mixed and tested. The main variables were the mixing ratio of sodium oxide (Na2O) of the activators to GGBS by weight, and the blain fineness of the GGBS. The hydration products and microstructural characteristics of the mortars tested were also investigated using X-ray diffraction (XRF) analysis, energy-dispersive X-ray (EDX) analysis, and scanning electron microscope (SEM) image. Test results showed that the compressive strength of alkali-activated mortars increased with the increase of blain fineness of GGBS. From the XRD and EDX analyses, a calcium silicate hydrates (CSH) gel was detected as the main hydration product showing that the molar Si/Ca ratio in the CSH gels is independent of the fineness of GGBS.

 alkali-activated mortar slag blain fineness compressive strength 24 to 27 August 2008 7th International Conference on Sustainable Energy Technologies SET2008 7 Seoul, Korea Malhotra, V.M. 2002. Introduction: sustainable development and concrete technology. Concrete International. Vol 24. No 7. 22 pp. Pcheco-Torgal, F, Castro-Gomes, J, & Jalali, S. 2007. Alkali-activated binders: A review. Part 2. About materials and binder manufacture. Construction and Building Materials. Doi:10.1016/j.conbuild mat.2007.03.019. Wang, S.D, Pu, X.C, Scrivener, K.L & Pratt, P.L. 1995. Alkali-activated slag cement and concrete: a review of properties and problems. Advances in Cement Research. Vol 27. pp.93-102. Korean Standards Information Center. 2006. Korean industrial standard. South Korea. Yang, K.H, Song, J.K, Ashour, A.F, & Lee, E.T. 2007. Properties of cementless mortar activated by sodium silicate, Construction and Building Materials. doi:10.1016 /j.conbuildmat.2007.07.003.