Agro-based biomass ashes can be chemically activated with Ca-Na based activators having low alkali concentration at ambient environmental conditions to produce sustainable binders. The utilisation of agro-based biomass ash in cementitious binders is restricted due to the presence of residual carbon, inconsistency in ash composition, and variability in ash reactivity. Reactivity assessment of the biomass ash is crucial for understanding its utilization potential. This study involves physico-chemical characterization and reactivity assessment of agro-based biomass ashes collected from India. The existing reactivity assessment tools may not be suitable to assess the reactivity of pozzolanic materials for chemical activation. Hence, the reactivity is assessed by measuring the heat of hydration of chemically activated biomass ashes and lime reactivity test. The heat of hydration study is carried out without the addition of sulfates and carbonates (modified R3 (Rapid, Relevant, and Reliable) method) at room temperature. The study aims at establishing composition-reactivity relationship of Indian biomass ashes.

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