Analysis on the Strength of Cement Mortar Mixed with Construction Waste Brick Powder

Table 5

Grey entropy of mortar strength activity index and BP particle characteristic.

Strength activity index		Specific surface area (m^2/kg)	Area mean particle size (μm)	Volume mean particle size (μm)
Compressive strength (MPa)	7 d	1.0000	0.9524	0.9363
	28 d	0.9942	0.9377	0.9229
Flexural strength (MPa)	7 d	0.9990	0.9461	0.9863
	28 d	0.9902	0.9329	0.9186