Evaluation of Freeze-Thaw Durability of Silica Fume Concrete with Spraying Inorganic Coating Using Ultrasonic Testing

Table 3

Concrete mix proportions.

Strength grade	Sample	Cement (kg/m^3)	Limestone (kg/m^3)	Sand (kg/m^3)	Water (kg/m^3)	Silica fume (kg/m^3)	Water-reducing agent (kg/m^3)	XT-HPA material (kg/m^3)	Water-binder ratio	External inorganic coating materials
C40	C40-A1-NCTC	418	999	785	176	22	2.2	2.2	0.4	XT-HPA + XT-SS
C40	C40-A2-NCTC	418	999	785	176	22	2.2	2.2	0.4	None
C40	C40-A3-NCTC	418	999	785	176	22	2.2	2.2	0.4	XT-HPS