3 research outputs found
E-modulus evolution and its relation to solids formation of pastes from commercial cements
Models for early age E-modulus evolution of cement pastes are available in the literature, but their validation is
limited. This paper provides correlated measurements of early age evolution of E-modulus and hydration of
pastes from five commercial cements differing in limestone content. A recently developedmethodology allowed
continuous monitoring of E-modulus from the time of casting. The methodology is a variant of classic resonant
frequencymethods,which are based on determination of the first resonant frequency of a composite beam containing
the material. The hydration kinetics — and thus the rate of formation of solids — was determined using
chemical shrinkagemeasurements. For the cements studied similar relationships between E-modulus and chemical
shrinkage were observed for comparable water-to-binder ratio. For commercial cements it is suggested to
model the E-modulus evolution based on the amount of binder reacted, instead of the degree of hydration.Fundação para a Ciência e a Tecnologia (FCT