Edição 117 - Controle da Qualidade do Concreto
Título
On the experimental determination of concrete compressive and tensile strengths
Autores
CLAUDIA A. MOREL; IGNACIO ITURRIOZ; JORGE RIERA
Resumo
For design purposes, concrete is often modelled as a linearly elastic, isotropic and homogeneous material.
DIN codes initially used cubic samples to ass ess uniaxial compress ive strength, but friction effects along the loading plates led to their replacement by cylinders.
Evidence that strength varies with the casting direction raised doubt about the implicit isotropy ass umption. Measuring the compress ive strength in vertical and horizontal directions requires, however,
properly supp orted cubic samples. To address the friction problem, grease performed better than other alternatives and was chosen for disc rete element method (DEM ) simulations of experimental results. Greased cubic sp ecimens led to nearly the same compress ive strength measurements as found
for cylinders or prisms, and determined anisotropy due to the casting direction. DEM simulations also suggest that cubic samples can replace conventional sp litting tensile strength tests, providing tensile strength data in both directions.
Palavras-chave
compress ive strength; testing, app aratus & methods; disc rete-element modelling; constitutive relations.
