Assessing the Quality of Concrete Tunnel Lining Exposed to Tunnel Fire through Residual Compressive Strength

Table 3

Compressive strength of the MYC and SPC concrete segments.

Samples	Before exposure to fire, f ′cu (MPa)	After exposure to fire of higher than 1000°C
		fc′ (MPa)	f ′cu (MPa)	Residual compressive strength (%)	Average residual strength (%)
MYC 1	72.30	37.3	46.63	64.5	66.04
MYC 2	72.30	38.4	48	66.39
MYC 3	72.30	38.9	48.63	67.25
SPC 1	72.45	36.37	45.46	62.75	62.46
SPC 2	72.45	34.5	43.13	59.53
SPC 3	72.45	37.75	47.19	65.1