Portland Pozzolana Cement (PPC) is widely used to achieve durable and sustainable concrete in modern construction. In the present study, the potential use of natural volcanic ash in the manufacturing of PPC has been studied. Young Toba Tuff (YTT) was collected from Jwalapuram, Andhra Pradesh, India. The pozzolanic performance of this ash was assessed by Strength Activity Index (SAI) and Frattini test. SAI of YTT was found to be above 75% for sufficient pozzolanicity. Further, the results of Frattini test were below the lime solubility curve, indicating that YTT could be potentially useful as pozzolanic material in concrete.
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