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

Table 6

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

Strength activity index		<1 μm	10∼20 μm	20∼40 μm	40∼60 μm	>60 μm
Compressive strength (MPa)	7 d	0.9956	0.9727	0.9461	0.8813	0.8113
	28 d	0.9997	0.9854	0.9380	0.8769	0.8113
Flexural strength (MPa)	7 d	0.9978	0.9783	0.9427	0.8794	0.8113
	28 d	1.0000	0.9890	0.9352	0.8754	0.8113