Effects of Hybrid Polypropylene-Steel Fiber Addition on Some Hardened Properties of Lightweight Concrete with Pumice Breccia Aggregate

Table 1

Mixture proportion.

Material	Mix type
	A	B	C	D	E
Water (lt/m^3)	225.00	225.00	225.00	225.00	225.00
Portland cement (kg/m^3)	455.00	455.00	455.00	455.00	455.00
Silica fume (kg/m^3)	45.00	45.00	45.00	45.00	45.00
Coarse aggregate (kg/m^3)	606.81	606.81	606.81	606.81	606.81
Sand (kg/m^3)	538.52	538.52	538.52	538.52	538.52
Superplasticizer (lt/m^3)	4.70	4.70	4.70	4.70	4.70
Set retarder (lt/m^3)	0.70	0.70	0.70	0.70	0.70
Polypropylene (kg/m^3)	0.90	0.90	0.90	0.90	0.90
Steel fiber (kg/m^3)	0.00	33.50	67.00	100.50	134.00