Pozzolanic activity index, PI (ASTM C 311) Chloride permeability was determined using a modified version of the ASTM Standard Method. A current passing through a mortar was monitored at regular one minute intervals over a 72 h period for each sample and the ionic flux calculated.
The pozzolanic activity index indicates the pozzolanic reactivity and potential contribution of the material to the overall strength development of concrete. Higher activity index values indicate greater reactivity and potential for enhancing concrete properties.
ASTM C311 is a standard test method used for sampling and testing fly ash or natural pozzolans to determine their suitability for use in Portland-cement concrete. It provides procedures for various physical and chemical properties of these materials, helping ensure the concrete's quality and performance.
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