Flexural Toughness Properties of Reinforced Steel Fibre Incorporated Alkali Activated Slag Concrete

Table 5

Toughness properties of various steel fibre reinforced geopolymer concrete.

Mix ID	GC5		GSF1		GSF2		GSF3
Steel fibre dosage	0%		0.50%		1%		1.50%
Testing age (days)	3	28	3	28	3	28	3	28
Flexural strength (N/mm^2)	6.12	7.08	8.09	8.66	10.12	11.2	13.03	13.2
Absolute toughness (N-m)	0.65	19.22	7.29	21.92	89.22	105.78	136.02	171.54
Post crack toughness (N-m)	0	0	5.04	11.79	70.15	74.61	115.12	135.03
Residual toughness (N-m)	0	0	4.13	10.83	63.37	30.31	103.57	157.43
Toughness index (Re3)	0	0	0.38	0.42	0.41	0.45	0.54	0.76

Note: test results denote an average of 3 concrete specimens tested with standard deviation of 12.25 and the coefficient of variation around 0.21.