Comparative Study of Strength and Corrosion Resistant Properties of Plain and Blended Cement Concrete Types

Table 5

Rapid chloride permeability test (RCPT) parameters for OPC, PPC, and PSC M30 and M40 grade concrete types.

Grade	28 days			90 days
	Charge passed (coulomb)	Free chloride contents; (ppm)	Chloride diffusion coefficient (cm^2s^−1) × 10^−10	Charge passed (coulombs)	Free chloride contents; (ppm)	Chloride diffusion coefficient (cm^2s^−1) × 10^−10
OPC M30	669	749	2.4	630	579	1.9
PPC M30	281	681	1.8	220	528	1.5
PSC M30	226	481	1.0	200	380	1.4
OPC M40	626	540	1.8	600	520	1.4
PPC M40	261	532	1.5	180	483	0.8
PSC M40	204	596	0.5	200	393	0.6