Effects of Aging on the Tensile Properties of Polyethylene Fiber-Reinforced Alkali-Activated Slag-Based Composite

Table 5

Uniaxial tensile behavior.

Age (days)	First-cracking strength (MPa)	Tensile strength (MPa)	Tensile strain capacity (%)	Toughness (MPa·m/m)	Strength performance index
3	3.65 ± 0.72	9.63 ± 1.40	6.58 ± 0.19	0.44	2.64
5	3.79 ± 0.56	10.70 ± 1.17	7.03 ± 0.10	0.51	2.82
7	3.93 ± 0.57	11.14 ± 0.79	7.07 ± 0.56	0.53	2.83
14	4.43 ± 0.43	10.97 ± 1.67	6.85 ± 0.46	0.53	2.48
28	4.58 ± 0.79	10.98 ± 0.97	6.81 ± 0.04	0.53	2.40
90	4.84 ± 0.91	11.27 ± 1.49	6.73 ± 0.53	0.54	2.33