Abstract
Fly ash is a by-product of the combustion of the coal-fired electric power stations, and disposal of fly ash has been one of the environmental challenges. Much of the studies have been focused on the mechanical property of fly ash concrete. It is no doubt that the use of high-volume fly ash as a partial replacement of cement is also one of the effect way to utilize fly ash. It is known that the compressive strength of fly ash concrete is lower than that of ordinary concrete at early age, especially for high-volume fly ash concrete. It is urgent for engineers to consider the compressive strength of high-volume fly ash concrete at different curing age. In this review, the compressive strength of high-volume fly ash concrete in various literature was reported and then analyzed. Furthermore, the proposal of the utilization of high-volume fly ash concrete is provided.
Highlights
According to American Society for Testing and Materials ASTM-C618[11], FA is classified into two sorts: Class F and Class C, where Class F fly ash has pozzolanic properties, Class C fly ash has pozzolanic properties and some cementitious properties
The CaO content of Class F FA is nearly equal to 10% or less than 15%, in the meantime, the CaO content of Class C FA ranges from 15% to 40%[12]
HVFA concrete with 50% Class C FA replacement level by mass showed lower compressive strength than fly ash concrete with 25% Class C FA replacement level by mass in early age, this trend reversed at the curing age of 90 days[13]
Summary
According to American Society for Testing and Materials ASTM-C618[11], FA is classified into two sorts: Class F and Class C, where Class F fly ash has pozzolanic properties, Class C fly ash has pozzolanic properties and some cementitious properties. HVFA concrete with 50% Class C FA replacement level by mass showed lower compressive strength than fly ash concrete with 25% Class C FA replacement level by mass in early age, this trend reversed at the curing age of 90 days[13].
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