Document Type
Article
Publication Date
1-1-2011
Abstract
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 reactivity 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.
Keywords
Chemical activators, Early strength, Grinding, OSM, Strength loss, Thermal treatment, Computer software maintenance, Grinding (machining), Heat treatment, Mortar, Portland cement, Potassium hydroxide, Reaction rates, Silicon compounds, Slags, Sodium, Chemical activation
Divisions
fac_eng
Publication Title
Construction and Building Materials
Volume
25
Issue
1
Publisher
Elsevier
Additional Information
673BD Times Cited:7 Cited References Count:15 --- Full text is available at : http://www.sciencedirect.com/science/article/pii/S0950061810003090