non-destructive assessment of concrete quality produced with riverbed sand and drainage sand as fine aggregates

In this work, the effect of fine aggregates from two different sources on the quality and strength of concrete was determined using upv measurements. the concrete samples were produced using a nominal mix ratio of 1: 1½: 3 and water-cement ratio of 0.55, with three different aggregate sizes (3/8, ½ and ¾ inches) of granite mixed separately with sand obtained from ogun river and a local drainage in abeokuta, southwestern, nigeria. upv was measured through each sample on days 1, 7, 14, 21 and 28 after curing using pundit lab+ equipment. comparison of the actual compressive strength and estimated compressive strengths from equations generated for each sample type using the crushed samples on the 7th and 28th days respectively shows that most estimations were within the acceptable ±20% variation. results show that there is no significant difference between the samples made from using either of the two fine aggregates.