Properties Of Lightweight Foam Concrete With The Inclusion Of Fibres
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Date
2015-01
Authors
AHMAD, MUHAMMAD HAFIZ
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Abstract
Lightweight Foamed Concrete (LFC) is a concrete consists of slurry mortar in which the air-voids is entrapped in the structure by the addition of foaming agent. The wide density variation of LFC from 500kg/m3 to 1800kg/m3 offers numerous advantages such as lightweight, good thermal and sound insulation, and high flow ability concrete product. Unfortunately, relatively high cement content and lack of aggregate in LFC results in high shrinkage and weak in tension. The inclusion of fibres was known to be effective in enhancing the strength and reducing shrinkage in normal concrete. However, the use of fibre in LFC is not widely practiced. This research investigate the properties of LFC using 1000kg/m3 density with the inclusion of five different fibres (steel, polypropylene, alkaline-resistance glass (AR-glass), kenaf and oil palm fibre) and fly ash as partial cement replacement. Two different percentages of fibre were used at 0.25% and 0.4%. Thirty percent of cement was replaced by fly ash. Steel fibre contributed almost 40% and 20% of increment towards flexural and tensile splitting strength respectively. The inclusion of AR-glass fibre and fly ash yield the best result in drying shrinkage whereby it recorded 79.3% better performance. AR-glass fibre LFC specimens exhibit the best result in terms of properties enhancement on average. Moreover, the properties of LFC with fibre addition could be optimized with the inclusion of fly ash at the later age.
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Foam Properties Of Lightweight Concrete , With The Inclusion Of Fibres