Abstract
This paper studies the drying shrinkage of mortar incorporating oil palm biomass waste including Palm Oil Fuel Ash, Oil Palm Kernel Shell and Oil Palm Fibre. Nano size of palm oil fuel ash was used up to 80 % as cement replacement by weight. The ash has been treated to improve the physical and chemical properties of mortar. The mass ratio of sand to blended ashes was 3:1. The test was carried out using 25 × 25 × 160 mm prism for drying shrinkage tests and 70 × 70 ×70 mm for compressive strength test. The results show that the shrinkage value of biomass mortar is reduced by 31% compared with OPC mortar thus, showing better performance in restraining deformation of the mortar while the compressive strength increased by 24% compared with OPC mortar at later age. The study gives a better understanding of how the biomass waste affect on mortar compressive strength and drying shrinkage behaviour. Overall, the oil palm biomass waste can be used to produce a better performance mortar at later age in terms of compressive strength and drying shrinkage.
Highlights
Drying shrinkage is strain associated with loss of moisture from the mortar by evaporation of water or hydration of cement
The results show that the shrinkage value of biomass mortar is reduced by 31% compared with Ordinary Portland cement (OPC) mortar showing better performance in restraining deformation of the mortar while the compressive strength increased by 24% compared with OPC mortar at later age
At 28 days curing, the compressive strength of biomass mortar increases by 24% as compared to OPC mortar
Summary
Drying shrinkage is strain associated with loss of moisture from the mortar by evaporation of water or hydration of cement. The change in volume of the mortar is related to the volume of water lost. The loss of free water from mortar may induce shrinkage. As the hydration process of the mortar continues, the water in the small capillaries is reduced significantly [1]. The loss of the water may force mortar to shrink causing cracks that can adversely affect the structural performances [2].
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