[Retracted] Empirical Investigation on Compressive Strength of Geopolymer and Conventional Concretes by Nondestructive Method

Table 11

Rebound number for GPC.

Concrete mix	Rebound no.
	7 days	14 days	28 days
Mix 1	28	27	26
Mix 2	29	28	28.5
Mix 3	31	31.5	31.25