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Arti Chouksey, Nirendra Dev, VVL Kanta Rao
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- Assistant Professor, Professor, Ex. Principal Scientist, Department of Civil Engineering, DCRUST MURTHAL, Department of Civil Engineering, Delhi Technological Institute, Bridge and Structure Division, CRRI, Haryana, Delhi, Delhi, India, India, India
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Abstract
nIn this Experimental Study, Raw Lime sludge from the Paper industry was characterized by XRD and TGA techniques. Lime Sludge was calcined for a temperature range of 550–7500C for 2 h and cooled by air cooling. The effect of calcination temperature on the reactivity of resultant Sludge was investigated by various indirect and direct methods of pozzolanic activity assessment such as the Strength Activity Test(SAI), Lime reactivity test, XRD, TGA, and API. It was concluded that the calcination of lime sludge affects the microstructure and pozzolanic reactivity of the resultant Sludge. For Calcination temperatures lower than 7000C, Calcinations of CaCO3 are not complete. Whereas at higher temperatures, the crystallization of amorphous content was enhanced. It is observed that calcinations of Sludge at a temperature of 7500C for 2h and slow cooling condition increases the pozzolanic reactivity of Sludge. Results showed that compared to other pozzolanic admixtures such as FA or BFS, CPS (Calcined Paper Sludge) had superior pozzolanic activity. With a calcination temperature of 750 °C, a calcination time of 2 hours, and a slow cooling method, their pozzolanic activity was exceptionally good. At 28 days old, the SAI (percent) of mortar with CPS produced under ideal circumstances was 94%, comparable with the fly ash’s quality (Class F).
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Keywords: Lime Sludge, Calcination, Calcined Clay, SAI, XRD, TGA, Lime Reactivity Test
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| Volume | |
| [if 424 equals=”Regular Issue”]Issue[/if 424][if 424 equals=”Special Issue”]Special Issue[/if 424] [if 424 equals=”Conference”][/if 424] | |
| Received | September 16, 2023 |
| Accepted | October 31, 2023 |
| Published |
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