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

Table 5

Variation characteristic in the ultrasonic compressive pulse velocity of three kinds of concrete under FT cycles.

Specimen	VP at 0 FT cycles (km/s)	VP at 300 FT cycles (km/s)	Decay rate of VP (%)
C40-A1-NCTC	4.55	3.45	24.14
C40-A2-NCTC	4.55	3.13	31.24
C40-A3-NCTC	4.65	3.70	20.36