Comparison of different methods for activation of ordinary Portland cement-slag mortars.pdf

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Comparison of different methods for activation of ordinary Portland cement-slag mortars.pdf

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Comparison of different methods for activation of ordinary Portland cement-slag mortars

Construction and Building Materials 25 (2011) 30–38Contents lists available at ScienceDirect Construction and Building Materials journal homepage: www.elsevier .com/locate /conbui ldmatComparison of different methods for activation of ordinary Portland cement-slag mortars Fathollah Sajedi *, Hashim Abdul Razak Department of Civil Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia a r t i c l e i n f o a b s t r a c tArticle history: Received 12 February 2010 Received in revised form 13 May 2010 Accepted 19 June 2010 Available online 16 July 2010 Keywords: OSM Grinding Thermal treatment Chemical activators Early strength Strength loss0950-0618/$ - see front matter 2010 Elsevier Ltd. A doi:10.1016/j.conbuildmat.2010.06.060 * Corresponding author. Tel.: +60 17 3293 252. E-mail address: f_sajedi@ (F. Sajedi).This paper compares three methods for activation of OPC-slag mortars (OSM): (1) prolonged grinding of binders (mechanical method), (2) elevated temperature curing of mortars (thermal method), and (3) use of chemical activators such as NaOH, KOH, and Na2SiO3, 9.35H2O (chemical method). The proper reactiv- ity of OSM was evaluated using a mixture of 50% OPC and 50% slag. Early and ultimate strengths were compared. All three activation methods accelerated both the slag reaction and strength development rates. However, the chemical method did not show a significant effect on the ultimate strength, while thermal activation increased the early strength by 3 days. Mechanical activation increased the early strengths of the mortar significantly, but about 6% strength loss occurred in the ultimate strength. Although, the application of mechanical and thermal activation methods needs extra equipment and energy, due to more significant of strength improvement; based on current test results, it can be said that mechanical activation is the most efficient and feasible method for the activation of OSMs. 2010 Elsevier Ltd. All rights reserved.1. Introduction In thi