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Fracture Behavior of Lightweight Aggregate Concrete Under Multiaxial Compressive Stress

Published online by Cambridge University Press:  22 February 2011

Peter Grübl
Peter Grübl*
Affiliation:
DYWIDAG, Erdinger Landstraße 1, D-8000 München, Federal Republic of Germany
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Abstract

Lightweight aggregate concrete under triaxial compressive load shows a different failure behavior compared with normalweight concrete. The increase of strength due to confining pressure is not as large as it is with normalweight concrete. It depends on the type of aggregate. The larger the stiffness of the aggregate the larger the increase of strenoth. Under hydrostatic pressure the low strength lightweight aggregate concrete (Bc ∼ 15 N/mm2 ) showed a confining strength which was about 2 to 2,5 times higher than the urfiaxial strength. Concrete with aggregates with high stiffness (E ∼ 14,000 N/mm2 ) and a uniaxial strength between 33 and 48 N/mm2 reached at a confining factor of 25% a strength increasing factor of about 4. The volumetric change curves show two remarkable facts. With confining factors of 0,05 and 0,10 lightweight aggregate concrete has at a stress level of 80% to 90% of the confining strength a volumetric increase which changes into a volumetric decrease shortly before reaching the ultimate load. With a confininn factor of 0.25 the volume decreases constantly until the fracture happens. The temporary volumetric increase is caused by a widening of the cracks. The fracture of lightweight aggregate concrete under confining pressure is mainly caused by an internal collapse of the aggregate grains.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 42: Symposium L – Very High Strength Cement-Based Materials , 1984 , 183
Copyright
Copyright © Materials Research Society 1985

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