Influence of Palm Oil Fuel Ash and W/B Ratios on Compressive Strength, Water Permeability, and Chloride Resistance of Concrete

Table 1

Physical properties of the materials.

Sample	Specific gravity	Retained on a 45 µm sieve (number 325) (%)	Median particle size, (µm)
Type I Portland cement	3.14	13.5	14.7
POFA (before grinding)	1.89	94.4	183.0
Ground POFA	2.52	1.7	10.7