Reactivity of cement constituents - Heat of hydration and bound water content methods

This document specifies two complementary test methods to assess the chemical reactivity of a pozzolanic or latent hydraulic cement constituent by measurements of heat of hydration (see Clause 5 and 8.3 Method A, Heat of Hydration) or bound water content (see Clause 5 and 8.4 Method B, Bound Water Content) of hydrated pastes composed of the cement constituent, calcium hydroxide, calcium carbonate, potassium sulfate, and potassium hydroxide cured at 40 °C for 72 h and 168 h (3 days and 7 days). These two test methods do not distinguish between latent hydraulic and pozzolanic reactivity. Therefore, these methods are used for measuring the chemical reactivity of following cement constituents as specified under EN 197 1 and EN 197 5: S, D, P, Q, V, W and T. These test methods are used in complement with the current specifications on cement constituent reactivity given by EN 197 1 and EN 197 5, i.e. the reactive silicon dioxide content measured according to EN 196 2 for cement constituents P, Q and V; the compressive strength of specified test mortars determined according to EN 196-1 for cement constituents W and T, and the pozzolanicity of pozzolanic cements according to EN 196 5 for CEM IV type cements according to EN 197-1. The test methods are used for qualification purposes if the cement constituents are tested at the fineness of the intended use.