Predictions of graphite strength under tensile and bending loads using fracture mechanics have been compared with experimental data and the currently used Weibull method. The methods are comparable for similar specimens but Weibull's method fails to predict the observed effects for large specimen si
On the influence of different load application techniques on the lateral strain and fracture of concrete specimens
β Scribed by G. Schickert
- Publisher
- Elsevier Science
- Year
- 1973
- Tongue
- English
- Weight
- 485 KB
- Volume
- 3
- Category
- Article
- ISSN
- 0008-8846
No coin nor oath required. For personal study only.
β¦ Synopsis
If concrete is tested by applying the load with rigid steel platens, restrained lateral deformations lead to a complicated multiaxial state of stress. Some methods to reduce the influence of friction between specimen and platens are discussed. Using aluminum sheets between platens and concrete compressive strength was found to be only 92% of compressive strength using rigid steel platens. With steel brushes instead of rigid steel platens the strength decreased to approximately 81%. A new method to determine concrete strength is described. Using a hydraulic cushion and individual pistons it is possible to reach uniformly distributed load all over the specimen.
Wenn die Betonfestigkeit in einer Ublichen
Druckpresse geprUft wird, erh~It man durch die Behinderung der Querdehnung einen mehrachsigen Spannungszustand. Es werden einige Methoden die durch Reibung eingefUhrte Querdehnungsbehinderung zu verringern vergleichend diskutiert. Die Druckfestigkelt des Betons sinkt auf g2% wenn Aluminiumfolien zwischen Probek~rper und Druckplatten gelegt werden. StahlbUrsten erniedrigen die Festigkeit auf etwa 81%. Eine neue Methode die Betonfestigkeit zu bestimmen wird skizziert dabel sorgen ein hydraullsches Klssen und mehrere voneinander unabh~ngige Belastungszylinder fur eine gleichm~Bige Belastung Uber die gesamte Probenfl~che. 487 488 Vol. 3, No. 4 COMPRESSIVE STRENGTH, CONCRETE, TEST METHODS, STRAIN * Bundesanstalt fur Materialprufung (BAM), Berlin -Federal Institute for Testing Materials.
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