The Development Of Fibres Reinforced Flowable High Strength Mortar And Concrete As Repair Materials
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Date
2011-04
Authors
Dawood, Eethar Thanon
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The study of flowable high strength concrete and mortar as repair materials was carried
out to understand the behaviour of these materials on construction sites. The
experimental tests were carried out on High Strength Flowable Mortar (HSFM) and
High Strength Flowing Concrete (HSFC) mixes reinforced with different percentages of
steel fibres and hybrid fibres of steel, Palm and Barchip fibres. These materials are
proposed as repair materials which are more beneficial and effective than epoxy or
polymer materials. The tests results revealed that the increase in steel fibre inclusions in
the HSFM and HSFC mixes resulted in reduction of flow. Thus, a higher dosage of SP is
needed to achieve the required flowability. The results of HSFM with steel fibres show
that the highest increase in compressive strength, in order of 20%, is obtained with steel
fibres fraction of 1.25%. Whereas, the results of HSFC with steel fibres show that the
highest increase in compressive strength, of about 10%, is obtained with steel fibres
fraction of 1.0%. The results obtained for each HSFM and HSFC specimen reinforced
with steel fibres indicated that the inclusion of 1.5, 1.75 & 2.0 % by volume exhibited
the most appropriate percentages to be used for repair applications.
Furthermore, the results for the hybrid fibres for each of the HSFM & HSFC showed
that the mixes of 1.75% steel fibres + 0.25% palm fibres, 1.5% steel fibres +
0.5% palm fibres and 1.5% steel fibres + 0.25% palm fibres + 0.25% Barchip Fibres
exhibit the best performance amongst the mixes tested. The hybridization of Steel Fibres with Palm and Barchip Fibres enhances the tensile strength, flexural toughness, static modulus of elasticity, and impact resistance, among other characteristics for each of the HSFM and HSFC mixes.
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Keywords
Flowable high strength concrete and morta , as repair materials