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Fundamental study on compressive strength development of seawater-mixed concrete in Johor, Malaysia

Md Noor, Nurazuwa and Ibrahim, F.A and Abojomjoma, A.M S (2018) Fundamental study on compressive strength development of seawater-mixed concrete in Johor, Malaysia. In: Concrete technology: research and applications. Penerbit UTHM, UTHM, pp. 70-77. ISBN 978-967-2110

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Concrete is made from water, cement and aggregate, and the present consumption of concrete worldwide is of order of 12 billion tons each year. In such tremendous volumes, human consume no material except water, bringing to the demand of freshwater resources and global freshwater shortage. Thus, this research was carried out to investigate the possibility of seawater as mixing water in concrete under Malaysia circumstances. Four (4) series of concrete mix was designed according to Department of Environment (DOE) with water-to-cementitious ratio of 0.45 and target mean strength of 40 MPa at 28 days. Control specimen was prepared using tap water as mixing water and the other three (3) concrete mixes was prepared using seawater, collected from Minyak Beku offshore located in Johor. Ordinary Portland cement was the main cementitious material and was replaced by weight with 15% and 30% of fly ash (FA) in several mixes. All mix series was curing in tap water and seawater for 7, 28 and 90 days. Artificial salt was made using sodium chloride (NaCl) at 10% concentration for seawater curing. All specimen was tested on slump and compression performance. Results showed that all concrete slump falls between targeted slump design range and classified as high workability. Slump with seawater and FA was higher compared to mix without FA. Meanwhile, compressive strength was increased with the increasing of hydration period in all mixes under both curing medium. It was found that, compressive strength for specimen with FA and seawater was lower at early stage but it started to increase with time in comparison with control mix. Overall, specimen curing in tap water gave better compressive strength performance compared to specimen curing in seawater.

Item Type: Book Section
Uncontrolled Keywords: Seawater; fly ash; plain concrete; compressive strength.
Subjects: T Technology > T Technology (General)
Divisions: Faculty of Civil and Environmental Engineering > Department of Structural and Material Engineering
Depositing User: Mr Abdul Rahim Mat Radzuan
Date Deposited: 18 Feb 2020 03:34
Last Modified: 18 Feb 2020 03:34
URI: http://eprints.uthm.edu.my/id/eprint/12643
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