Abstract:
This research was aimed to study the dynamic elastic
modulus (Ed) of cement-only concrete, fly ash concrete, bottom
ash concrete and synthetic fiber concrete. The bottom ash was
used as an internal curing material. Non-destructive testing by
ultrasonic pulse velocity test (UPV) was used to determine the
ultrasonic pulse velocity and to calculate Ed of concrete. The
Ordinary Portland cement was used in this study as binder and
the water to binder ratio was 0.55. In this study, the weight
percentages of replacement of cement by fly ash were 0, 30 and
50%. The volume percentages of replacement of fine aggregate
by the bottom ash were 10 and 30%. The content of synthetic
fibers were 2 and 4 kilograms per cubic meter. The results
showed that the Ed determined with the UPV method higher than
the elastic modulus (Ec) about 13-39%. The cement-only
concrete have Ec and Ed values nearly the same with synthetic
fiber concrete. The fly ash concrete and bottom ash concrete
have Ec and Ed lower than that of the cement-only concrete. The
Ec and Ed decrease with the increase of fly ash or bottom ash
content. The Ec and Ed have linear relationship while the
compressive strength and UPV have exponential relationship