The Effect of Variation of Molarity of Alkali Activator and Fine Aggregate Content on the Compressive Strength of the Fly Ash: Palm Oil Fuel Ash Based Geopolymer Mortar

Table 1

Chemical composition and physical properties of POFA and FA.

(a)

Chemical compounds	CaO	SiO2	Al2O3	MgO	Na2O	SO3	P2O5	K2O	TiO2	Cr2O3	MnO	Fe2O3	Cl	LoI
POFA	5.57	67.72	3.71	4.04	0.16	1.07	4.13	7.67	0.27	—	0.11	4.71	0.65	6.20
FA	5.31	54.72	27.2	1.10	0.43	1.01	1.12	1.00	1.82	0.04	0.10	5.15	0.01	6.80

(b)

Physical properties	Colour	S.G.	S.S.A.	𝐷  [4, 3]	𝐷  [3, 2]	𝐷 (𝑣, 0.1)	𝐷 (𝑣, 0.5)	𝐷 (𝑣, 0.9)
POFA	Black	2.2	3.41	20.06	3.49	3.23	18.46	38.27
FA	Grey	2.4	1.72	36.43	1.76	0.48	16.50	101.74

S.G.: Specific gravity
S.S.A.: Specific surface area, m²/g
𝐷  [4, 3] = Volume moment mean, μm
𝐷  [3, 2] = Surface area moment mean, (μm)²
𝐷 (𝑣, 0.1) = 10% of particle by volume below this size
𝐷 (𝑣, 0.5) = 50% of particle by volume below this size
𝐷 (𝑣, 0.9) = 90% of particle by volume below this size.