Mechanical Behaviour Of High Metakaolin
Lightweight Aggregate Concrete
Author(s)
A. Al-Sibahy & R. Edwards
Abstract
The work described in this paper forms part of a much larger investigation of the
behaviour of a new developed type of lightweight aggregate concrete which
would be suitable for use as load bearing concrete masonry units. The
experimental work investigated the effect of high metakaolin (MK) content on
the mechanical behaviour of newly modified lightweight aggregate concrete.
15% metakaolin and waste glass were used as a partial replacement for both
ordinary Portland cement and natural sand. A medium grade expanded clay type
Techni Clay was used as a coarse aggregate in the concrete mixes. Equal
amounts of waste glass with particles sizes of 0.5-1 and 1-2 mm were used
throughout this study. Unit weight, compressive and splitting tensile strengths
were measured at various ages in accordance with the relevant British/EN
standards. Fresh concrete properties were observed to justify the workability
aspect. An assessment was carried out to indentify the pozzolanic activity of
metakaolin material. The tests results were compared with the obtained results of
controlled and lower metakaolin contents concretes which were previously
studied. The tests results showed that metakaolin material had an explicit role in
improving the strength and unit weight of modified lightweight concrete mixes.
Compressive and splitting tensile strengths increase with an increase in the
metakaolin content, while a counteractive behaviour was recorded for the unit
weight aspect. The metakaolin material showed higher pozzolanic activity which
was overcame there duction of compressive strength due to the negative effect of
glass aggregate. However, the workability of concrete mixes degraded at higher
metakaolin inclusion.
Keywords: lightweight aggregate concrete, metakaolin, waste glass, mechanical
behaviour.
Keywords
lightweight aggregate concrete, metakaolin, waste glass, mechanical
behaviour
Related Book
Other papers in this volume
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