Performance Evaluation and Microstructure Characterization of Metakaolin-Based Geopolymer Containing Oil Palm Ash

Table 1

Chemical composition (wt.%) and physical property of MK and OPA.

Element	MK	OPA
SiO2	50.30	38.37
Al2O3	41.02	1.48
CaO	0.33	13.84
Fe2O3	1.05	3.01
K2O	4.08	14.09
TiO2	1.50	0.21
MgO	—	3.00
Other	—	5.57
LOI	1.72	20.43
Specific surface area (m^2/g) BET	13.61	13.06
𝑑10 (𝜇m)	1.352	4.321
𝑑50 (𝜇m)	6.308	19.305
𝑑90 (𝜇m)	88.803	100.109