Comparison characterization between ordinary concrete and concrete with POFA .
There are several references to the use of palm oil fuel ash in concrete available on the internet. One reference indicated the ash must be ground to ~15 microns and ~7 microns. When used as a partial replacement for portland cement the addiditves extended set times, although there was some indicationof improved compressive strengths.
This seems somewhat similar to the use of rice hull ash. RHA must be properly burned or the pozzolonic properties of the final product are not as desirable.
Hope this helps.
Tom
POFA is the ash formed from the burned palm oil shell and fiber in an incinerator. it is grey in colour. Increse the percentage replacement of POFA , it will decrease the workability of concrete. This might contribute to it porous nature and decrease the concrete workability. In term of strength development, it more depend on nature of POFA used, such as the fineness,chemical composition due to burned temperature and percentage of POFA replacement. Furthermore, POFA give the better improvement in durability such as it is good used for chloride resistant in concrete making (only up to certain amount of POFA added)
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