The capacity of ternary blends containing slag and high-calcium fly ash to mitigate alkali silica reaction

Cement and Concrete Composites, Volume 49, May 2014, Pages 92-99.

Seyon Kandasamy, Medhat H. Shehata.

Inspec-sol Inc., Mississauga, ON, Canada and Ryerson University, Toronto, ON, Canada.

 

Abstract

The efficiency of ternary blends containing high-calcium fly ash and slag in mitigating alkali-silica reaction (ASR) was evaluated. The concrete prism expansions showed that the ternary blends did not offer significant advantage over binary blends of portland cement and either of the individual material at the same total SCM content. The ability of a particular blend to mitigate ASR was related to its capacity to retain alkalis in its hydration products, as evaluated by an alkali leaching test. For the slag and fly ash used in this study, the capacity to retain alkalis increased with the ability of the blend to consume Ca(OH)2 during its pozzolanic reaction. For the blends investigated here, the alkali leaching test was more realistic than the accelerated mortar bar test in predicting the 2-year expansion of concrete prisms. The adopted alkali leaching test is proposed to be used as a tool to compare the efficacy of different cementing blends to mitigate ASR.

 

Go to Journal

 

Check Also

Flexural Buckling Behavior of WAAM-Fabricated Tubular Columns: An Experimental Analysis - Advances in Engineering

Flexural Buckling Behavior of WAAM-Fabricated Tubular Columns: An Experimental Analysis