Optimization of Arabian-Shield-Based Natural Pozzolan and Silica Fume for High-Performance Concrete Using Statistical Design of Experiments

Table 3

Classification of concrete chloride ion penetrability (ASTM C 1202).

Charge passed (Coulombs)	>4000	2000–4000	1000–2000	100–1000	<100
Permeability class	High	Moderate	Low	Very low	Negligible