Sudin, M.A.S. and Ramli, M.
(2014)
Effect of Specimen Shape and Size on the Compressive
Strength of Foamed Concrete.
MATEC Web of Conferences, 10 (02003).
pp. 1-6.
ISSN 2261-236X
Abstract
Lightweight concrete, in the form of foamed concrete, is a versatile material
that primarily consists of a cement based mortar, mixed with at least 20% volume of air.
Its dry density is typically below 1600 kg/m3 with a maximum compressive strength of
15MPa. The ASTM standard provision specifies a correction factor for concrete strength
of between 14 and 42Mpa, in order to compensate for a reduced strength, when the aspect
height-to-diameter ratio of a specimen is less than 2.0. However, the CEB-FIP provision
specifically mentions a ratio of 150mm dia. x 300mm cylinder strength to 150 mm cube
strength; though, both provision requirements do not specifically clarify the applicability
and/or modification of the correction factors for the compressive strength to lightweight
concrete (in this case, foamed concrete). The focus of this work is to study the effect of
specimen size and shape on the axial compressive strength of concrete. Specimens of
various sizes and shapes were cast with square and circular cross-sections i.e., cubes,
prisms, and cylinders. Their compression strength behaviours at 7 and 28 days were
investigated. The results indicate that, as the CEB-FIP provision specified, even for
foamed concrete, 100mm cubes (l/d = 1.0) produce a comparable compressive strength
with 100mm dia. x 200mm cylinders (l/d = 2.0).
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