Abstract
The influence of silica modulus (Ms) on the compressive strength of alkali activated ultrafine palm oil fuel ash based mortar has been investigated. Two alkali activated mortar mixtures, S1 and S2 were prepared using sodium silicate (Na2SiO3) with initial silica moduli, Ms of 3.3 and 2, respectively. The Na2SiO3 was used in combination with sodium hydroxide (NaOH) with NaOH concentration of 10 M. The results indicate that the S2 mortar mixture has higher strength than the S1 mortar mixture at all testing ages, with 28 day strength of 27.18 MPa and 32.8 MPa recorded by S1 and S2 mortar mixture, respectively. Hence, lower Ms leads to higher compressive strength. The higher compressive strength of S2 is corroborated by the formation of more C-S-H as implied by the Fourier Transform Infra-red (FTIR) spectra analysis.
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