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The addition of a small quantity of lime has been recommended to enhance the early strength of High-Volume Fly Ash Concrete. However, the quantity of lime may not be adequate in the case of Very High Volume Fly Ash Concrete (VHVFAC). This study compares the mechanical properties of VHVFAC with 80% cement replacement with ultrafine fly ash with the addition of lime and silica fume (SF), with that of PC concrete over a 90-day period. Correlation between the compressive strength and other mechanical properties of VHVFAC are presented. The use of SF enhanced the mechanical properties of the VHVFAC, with the increase more predominant at early age. VHVFAC exhibited similar mechanical performance with PC concrete by the end of the 90 days.

Engineering properties of very high volume fly ash composite