EFFECT OF CALCINATION CONDITION AND COOLING METHOD ON REACTIVITY OF LIME SLUDGE

Open Access

Year : 2024 | Volume :11 | Special Issue : 10 | Page : 36-48
By

    Arti Chouksey

  1. Nirendra Dev

  2. VVL Kanta Rao

  1. Assistant Professor, Department of Civil Engineering, DCRUST MURTHAL, Haryana, India
  2. Professor, Department of Civil Engineering, Delhi Technological Institute, Delhi, India
  3. Ex. Principal Scientist, Bridge and Structure Division, CRRI, Delhi, India

Abstract

In 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).

Keywords: Lime Sludge, Calcination, Calcined Clay, SAI, XRD, TGA, Lime Reactivity Test

[This article belongs to Special Issue under section in Journal of Polymer and Composites(jopc)]

How to cite this article: Arti Chouksey, Nirendra Dev, VVL Kanta Rao , EFFECT OF CALCINATION CONDITION AND COOLING METHOD ON REACTIVITY OF LIME SLUDGE jopc 2024; 11:36-48
How to cite this URL: Arti Chouksey, Nirendra Dev, VVL Kanta Rao , EFFECT OF CALCINATION CONDITION AND COOLING METHOD ON REACTIVITY OF LIME SLUDGE jopc 2024 {cited 2024 Feb 23};11:36-48. Available from: https://journals.stmjournals.com/jopc/article=2024/view=133484

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Special Issue Open Access Original Research
Volume 11
Special Issue 10
Received September 16, 2023
Accepted October 31, 2023
Published February 23, 2024