Experimental Study of Hollow RC Beams Strengthened by Steel Fiber under Pure Torsion

Table 1

Chemical properties of cement [16].

Composition of cement	(%)	Specification limit
(CaO)	62.83
SiO2	22.54
AL2O3	5.4
Fe2O3	2.64
MgO	3.23	5%
SO3	2.45	2.8%
(Na2O)	0.24
(K2O)	0.62
(L.O.I)	0.71	4.00 (max.)
(I.R)	0.57	1.50 (max.)
(L.S.F)	0.91	0.66–1.02
Cement compound
C4AF	7.93	7.72–8.02
C3A	10.21	11.96–12.3
C2S	33.65	28.61–37.9
C3S	38.51	31.03–41.05