Publicação
E-modulus evolution and its relation to solids formation of pastes from commercial cements
| Resumo: | 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. |
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| Autores principais: | Maia, Lino |
| Outros Autores: | Azenha, Miguel; Geiker, Mette; Figueiras, Joaquim A. |
| Assunto: | Hydration Elastic moduli Elastic moduli Resonant frequency Resonant frequency Cement paste Limestone filler Cement paste (D) Elastic moduli (C) Hydration (A) Limestone filler (D) |
| Ano: | 2012 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso restrito |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | 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. |
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