A Study on the Flexural Behaviour of Geopolymer Lightweight Eco-Friendly Concrete Using Coconut Shell as Coarse Aggregate

Table 8

Deflection at service stage and ultimate stage.

Beam ID	Service stage		Ultimate stage		Ductility index
	Load (kN)	Displacement	Load (kN)	Displacement	(ΔU)/(ΔY)
		(Δy) (mm)		(Δu) (mm)
Singly reinforcement beam
GPCSC-S1	18.67	7.56	28	16.82	2.22
GPCSC-S2	25.33	9.02	38	18.99	2.11
GPCSC-S3	36.00	10.67	54	28.99	2.72
GPCC-S1	20.00	3.21	30	11.23	3.50
GPCC-S2	26.67	3.45	40	12.34	3.58
GPCC-S3	38.67	7.89	58	25.99	3.29
Doubly reinforcement beam
GPCSC-D1	54.67	10.45	82	29.45	2.82
GPCSC-D2	88.00	15.67	132	43.44	2.77
GPCSC-D3	102.67	18.56	154	53.45	2.88
GPCC-D1	56.00	7.11	84	25.22	3.55
GPCC-D2	90.67	9.99	136	35.45	3.55
GPCC-D3	108.00	15.66	162	45.45	2.90