Suppressing alkali-silica reactivity using class F fly ash: An experimental and analytical investigation

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This paper reports the optimum dosages of experimental and analytical Class F fly ash that could suppress the excessive expansions of six reactive aggregates to below the prescribed failure limits of mortar bars at test durations of 14, 28, and 56 days. The optimum fly ash content of each reactive aggregate was determined by the proposed models based on the equivalent SiO2 (SiO2(eq)), equivalent CaO (CaO(eq)), and the CaOeq/SiO2(eq) of total cementitious materials, and was then compared with that obtained by the experimental procedures. The proposed models were also used on the experimental data of previous research studies consisted of eight reactive aggregates with different mineralogy, two types of portland cements, and six types of Class F fly ashes having a wide spectrum of alkali, silica, and calcium contents. The study revealed that a good correlation existed between the optimum fly ash content obtained by the experimental procedures and that predicted by the analytical investigations. Copyright © 2016, American Concrete Institute.


Aggregate mineralogy; Alkali-silica reactivity (ASR); And CaOeq/SiO2(eq) of total cementitious materials; CaOeq; Class F fly ash; Mortar expansion; SiO2(eq); Test duration

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