Faculty Publications
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Item Assessment on durability of lightweight concrete using alkali modified fly ash based atrificial coarse aggregate (FACA)(Taylor and Francis Ltd., 2023) Muhammed, A.; Palanisamy, T.; Shanmugamoorthy, S.Thermal power plant is the backbone of India’s energy generation comprising of more than 50%. Since Indian coal is of low grade with ash content of the order of 30–55% in comparison with imported coal which has low ash content of the order of 3–15%, huge piles of fly ash is left over which poses environmental degradation. In order to reduce its harmful effects on environment, we have to reuse/recycle this industrial by-product. As concrete contains 80% coarse aggregate, huge quantity of fly ash waste can be utilized if we reuse it as artificial coarse aggregate. This work compiles the results of a pilot scale study on durability properties of concrete made from fly ash-based artificial coarse aggregate (FACA). The molarity of NaOH, NaOH-to-Na2SiO3 ratio and alkaline-solution-to-fly-ash ratio used in this research are 8 M, 0.5 and 0.4 respectively. The coarse aggregate is produced by crushing the geopolymer mass in a crusher. The fundamental durability properties of the concrete (FACACRETE) prepared from FACA is compared with the conventional concrete (using crushed granite stone) at M20, M25 and M30 grades of concrete. It is observed that on increasing the grade of concrete, the ultrasonic pulse velocity test gives better result for both conventional concrete and FACACRETE. © 2022 Taylor & Francis Group, LLC.Item Experimental Investigation on FACA and FACACRETE — An Innovative Building Material(Springer Verlag service@springer.de, 2019) Muhammed, A.; Palanisamy, P.Recently, many studies are put forward by researchers to utilize waste materials like fly ash, GGBS, etc. in the construction industry due to the problems arise in the disposal of these materials. A novel study on incorporating the FACA (fly ash artificial coarse aggregate) in concrete is illustrated in this paper by comparing fly ash artificial coarse aggregate concrete (FACACRETE) with normal concrete. Different mixtures of geo-polymers were prepared using different molarities of NaOH solution and varying alkaline solution to fly ash ratio. These mixtures were cast to form a hard mass and cured. It is then pulverized in to fly ash artificial coarse aggregates (FACA). The properties of FACA were determined and are compared with conventional coarse aggregates. From the experiment, it is found that the FACA is a lightweight aggregate. It can be used for wearing as well as non - wearing surfaces as per IS: 383 - 2016. It is found that 8MA1 (8 Molar NaOH solution and 0.4 is the alkaline solution to fly ash ratio) is economical and can be used for further research as NaOH needed is less. This mix (8MA1) of FACA is used to prepare fly ash artificial coarse aggregate concrete (FACACRETE). The mechanical properties of both normal concrete and FACACRETE are compared and the results suggest that the compressive, splitting tensile, flexural strengths and the stress - strain relationship of FACACRETE is comparable with conventional concrete of same grade as per IS 456. The compressive toughness and compressive index of the FACACRETE is found to be more than the conventional concrete. The failure pattern of FACACRETE is associated with multiple cracking and that of normal concrete is localized failure. On considering the experimental investigations conducted here, it is found that the FACA can be used to replace conventional coarse aggregate in concrete. © 2019, Korean Society of Civil Engineers.