Table 3.

Compressive strengths of samples at different ages (hybrid concrete refers to the high-content hybrid fiber–polymer concrete studied in this paper; plain concrete refers to ordinary concrete C40 without fiber or polymer).

Time	Type	Load (kN)	Strength after Reduction (MPa)	Average Strength (MPa)
3 days	Plain concrete	211.99	20.14	19.92
		223.99	21.28
		192.99	18.34
	Hybrid concrete	213.99	20.33	20.30
		218.99	20.81
		207.99	19.76
7 days	Plain concrete	370.99	35.25	39.36
		416.99	39.62
		454.99	43.23
	Hybrid concrete	350.99	33.35	35.28
		391.99	37.24
		370.99	35.25
28 days	Plain concrete	422.99	40.19	40.25
		445.99	42.37
		401.99	38.19
	Hybrid concrete	559.98	53.20	52.82
		556.98	52.92
		550.98	52.35