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Abstract:Vibrations are potentially harmful to green concrete in shaft foundations, and many states, including
Mississippi, cautiously established limits in terms of compressive strength, distance boundary, and
wait time to protect early age concrete. But these limits could be overly conservative with respect
to experimental evidence, and perhaps unnecessarily impede construction schedules and add cost to
projects. The objective of this study was to quantify the effects of early age vibrations on concrete
performance. Concrete cylinders were exposed to several combinations of vibration magnitudes
and durations that were representative of shaft construction, and at ages coincident with the
sensitive period between initial and final set. The vibrations had no consistent effect on compressive
strength and electrical resistivity. There was also no discernable difference between limestone and
river gravel coarse aggregates.
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