The compressive strength of precast concrete composites
(cubes) developed using different proportionates of GRP waste
powder under water curing and oven curing were tested at 14 days,
28 days and 180 days and the results are reported and discussed
below. Fig. 6 (a, b) shows the testing compressive strength of
concrete specimen. The results of 14 days, 28 days and 180 days
compressive strength of concrete are shown in Table 3.