The Feasibility of Using Palm Oil Ash …
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0
500
1000
1500
2000
2500
12d
24d
Density, kg/m³
Fig. 4 Density of compressed POFA bricks at 12 and 24 days curing
0
5
10
15
20
25
12-d
24-d
Water absorption, %
Fig. 5 Water absorption of compressed POFA brick samples at 12 and 24 days curing
unground POFA (11.9–20.5%), particularly at 24 day curing period. At the early
age of curing, all brick samples absorbed more water due to less formation of the
hydration product. As initial water curing duration increased, more solid hydration
products were formed, resulting in lower absorptivity of longer cured specimens
(Jaturapitakkul et al. 2011). Significant reduction in the water absorption of all
compressed ultrafine POFA brick samples was due to diminishing of the voids
through the pore void modification. With high pozzolanic activity, formation of the
solid hydration products has produced compressed ultrafine POFA brick with more
57
0
500
1000
1500
2000
2500
12d
24d
Density, kg/m³
Fig. 4 Density of compressed POFA bricks at 12 and 24 days curing
0
5
10
15
20
25
12-d
24-d
Water absorption, %
Fig. 5 Water absorption of compressed POFA brick samples at 12 and 24 days curing
unground POFA (11.9–20.5%), particularly at 24 day curing period. At the early
age of curing, all brick samples absorbed more water due to less formation of the
hydration product. As initial water curing duration increased, more solid hydration
products were formed, resulting in lower absorptivity of longer cured specimens
(Jaturapitakkul et al. 2011). Significant reduction in the water absorption of all
compressed ultrafine POFA brick samples was due to diminishing of the voids
through the pore void modification. With high pozzolanic activity, formation of the
solid hydration products has produced compressed ultrafine POFA brick with more