The elastic properties of concrete under bi-axial loading . ace^ experimented v:ith cubes of stoneand found that pasteboard had no effect when placed betT:een thespecimen and the plates but that when cork or a mixture ofstearine 9Jid wax was placed between the plates and the specimenthat the breal^ing load was reduced about half. (Perhaps the stone and mortar tested by these men had ahigh Poissons ratio which increased the deformation perpendiculato the applied load when the restraint of the plates was reduced,and caused failure. ) M. Peret concluded that the results of the men quoted abovewer
The elastic properties of concrete under bi-axial loading . ace^ experimented v:ith cubes of stoneand found that pasteboard had no effect when placed betT:een thespecimen and the plates but that when cork or a mixture ofstearine 9Jid wax was placed between the plates and the specimenthat the breal^ing load was reduced about half. (Perhaps the stone and mortar tested by these men had ahigh Poissons ratio which increased the deformation perpendiculato the applied load when the restraint of the plates was reduced,and caused failure. ) M. Peret concluded that the results of the men quoted abovewere too erratic and based on too small a number of experimentsto be reliable, and he conducted a few tests on cement mortarprisms and cubes. Five square prisms 2-cm. on a side and6-cm. hi^h were broken between steel plates and four similarones between plates coated with 0,5-mm. of parrafine. The Hittheilungen d. mech. techn. Labor, d, PI. , 1900. z Atxi del Collegio degl•Ingegneri e Architetti in Palermo,1901- Baumaterialienlvunde, 151 brealcins loads of the first set of prlsir^s averaced 430 X^./cm.^and Of the second set 337 ^, or 78 per cent of 430. Heattributed the reduction to the fact that the parrafine squeezedout at the edses of the loaded faces and therefore that the loadwas concentrc^ted on the center part of the prlsn. All the experiments mentioned above -ere made on a fev; spec-imens and they ivere far from concordant. Another short set ofexperiments by Peret on twelve specimens pointed out that tiieultimate load carried by a cement mortar 3-cm. high and3-cm. in di^aneter, was the same whether tested with a paste ofsoap between the specimen and the plates (465 1:^. load) orwhether tested in direct contact with the steel plates (462 1^^). The form of the fracture in the two cases was differenthowever. With nothing; between the specimen the plates,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
