Mechanical Properties of SiO₂-Coated Carbon Fiber-Reinforced Mortar Composites with Different Fiber Lengths and Fiber Volume Fractions

Table 5

Results of strength tests with different fiber lengths and fiber volume fractions.

Type of mortar	Fiber volume fractions (%, in vol)	Fiber lengths (mm)	Mortar strength (MPa)
			SiO2-coated carbon fiber (CFRM)	0.5		6	31.4	3.6	8.7
12	30.4	3.7			8.2
1.0	6	30.5		4.3	7.1
	12	30.0		4.6	6.5
1.5	6	27.1		4.5	6.0
	12	27.3		4.9	5.6
2.0	6	21.6		4.1	5.3
	12	23.6		4.3	5.5
Uncoated carbon fiber (CFRM)	0.5	6	29.6	3.2	9.3
		12	28.6	3.4	8.4
	1.0	6	28.5	3.9	7.3
		12	28.0	4.2	6.7
	1.5	6	25.3	4.1	6.2
		12	24.8	4.5	5.5
	2.0	6	19.7	3.7	5.3
		12	20.7	3.9	5.2
Plain mortar	—	—	30.6	3.1	9.9

is the average of the compressive strength measured at 28 days, and is the average of the flexural strength measured at 28 days.