The report describes a fluid-loading type of platen which can apply uniform sustained stresses of more than 15 N/mm2 (2200 1b/in2) to rectangular specimens. Four such platens were used in a square configuration to apply uniform biaxial compressive and tensile stresses to a 150 × 150 × 19 mm (6 × 6 × 3/4 in) specimen. Two fluid platens in combination with two rams were used to apply uniform biaxial compressive and tensile stresses to a 150 × 273 × 19 mm (6 × 10 3/4 × 3/4 in) specimen. Tests showed that the fluid platens had negligible transverse stiffness and did not, therefore, restrain the specimen or absorb transverse loads.
Get full access to this article
View all access options for this article.
References
1.
HilsdorfH.‘Versuchstechnische Probleme beim Studium der Zweiachsigen Festigkeit des Betons’, Bericht Nr 41, 1965 (Materialprüfungsamt für das Bauwesen der Technischen Hochschule Munchen).
2.
HannantD. J.‘Equipment for the measurement of creep of concrete under multiaxial compressive stress’, R.I.L.E.M. Bull.1966 No. 33, 421.
3.
DukeC. H.DavisH. E.‘Some properties of concrete under sustained combined stresses’, Proc. Am. Soc. Test. Mater.194444, 888.
4.
DavisR. E.DavisH. C.HamiltonS. S.‘Plastic flow of concrete under sustained stress’, Proc. Am. Soc. Test. Mater.1934, 34, 354.
5.
FopplA.Mitt. mech.-techn. Lab. Münch. 1900. Hefte 27 und 28.
6.
MoriceP. B.BaseG. D.‘The design and use of a demountable mechanical strain gauge for concrete structures’, Mag. Concr. Res.19535 (No. 13), 37.
