Performance Analysis of a Recycled Concrete Interfacial Transition Zone in a Rapid Carbonization Environment

Table 3

Mixing proportion and 28-day compressive strength of the concrete samples.

Steel grade	Cement (kg/m^3)	Fine aggregate (kg/m^3)	Coarse aggregate (kg/m^3)	Water-cement ratio	28 d compressive strength (MPa)
C30	300	780	1170	0.39	39.2
C40	375	750	1125	0.35	50.7
C50	467	713	1070	0.31	61.3