RESEARCH ARTICLE


High Performance Reinforced Concrete Beams made with Sandstone Reactive Aggregates



Paramasivam Suresh Kumar*, Md. Abdul Mannan , KurianVelluruzhathil John
Civil Engineering Program, School of Engineering and Information Technology, Universiti Malaysia Sabah, 88999 Kota Kinabalu, Malaysia.


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© 2008 Kumar et al

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Civil Engineering Program, School of Engineering and Information Technology, Universiti Malaysia Sabah, 88999 Kota Kinabalu, Malaysia; Tel: +6-088-320 000 (ext) 3100; Fax: +6-088-320348; E-mails: drpsuresh@hotmail.com, mannan@ums.edu.my


Abstract

An investigation on the flexural behaviour of reinforced high performance concrete (HPC) has been conducted. Crushed sandstone known as reactive aggregate was used for both fine and coarse aggregates. In addition, mineral admixtures such as silica fume and fly ash combined with superplasticiser was used. The beams were made with concrete having compressive strength in the range of 74 - 88 N/mm2 and tensile reinforcement in the range of 1.34 to 3.14 %. The experimental ultimate moment was found to be about 14 - 34 % and 3 - 15 % higher than the predicted ultimate moment based on BS 8110 and ACI 318 respectively. Due to lower stiffness of reactive sandstone aggregates, the actual deflections of the beams were found to be slightly above allowable values under service loads. The observed crack widths under service loads were within acceptable limits. It was found that HPC made with crushed sandstone coarse and fine aggregate had better structural integrity. Hence, there is a high potential to produce high strength HPC using sandstone aggregates with silica fume and fly ash.

Keywords: High performance concrete, Sandstone aggregate, Deflection, Crack, Neutral axis.