| Abstrakt: |
Pervious concrete denotes an ecofriendly concrete with enhanced porosity that has the ability to reduce surface run-off parallelly enhancing ground water quantity and quality. Biochar on the other hand serves as an effective replacement for cement in pervious concrete improving its various properties. This study involves using biochar sourced from palm flower as partial cement replacement in pervious concrete and is analysed for various fresh and hardened properties. Results show that replacement of cement using palm flower biochar (PFC) for up to 1% by weight of cement aids in the enhancement of various properties of pervious concrete without compromising the compressive strength of the mix. Further increase in PFC replacement reduces the compressive strength by 10–16% in comparison to reference mix. PFC replacement also aids in the enhancement of infiltration capacity which is another primary characterising property of pervious concrete from 7.36 to 9.41 mm/s when replaced with 1%. Further other key properties of pervious concrete namely water absorption capacity and porosity show an enhancement of 14% and 16% respectively in comparison to reference mix in 1% replacement. There is also a significant reduction in properties namely abrasion resistance and fresh and hardened density accordingly. Furthermore, analytical characterisation techniques namely FTIR, SEM/EDAX and XRD are used to verify the presence of variation in hydration products of cement owing to replacement using PFC. Water quality parameters so considered include total suspended solids, chemical oxygen demand, total organic carbon, biochemical oxygen demand, total phosphates and total nitrates. The maximum removal efficiency of 76.7% is obtained for TP on 2% replacement. Though the replacement enhances the stiffness of the mix, it still can be used for pavement purposes. With increasing PFC content, water purification ability of the samples is also improved. Thus, palm flower biochar serves as a potential cement replacer when replaced up to an optimum of 1% as this does not compromise both the strength, purification and other mandatory attributes of pervious concrete. [ABSTRACT FROM AUTHOR] |
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