Assessment of Curing Exposures Effect on the Long-term Engineering Properties of Novel Lightweight Aggregate Concrete

Mohammad H.  Jannaty; Dawood Atrushi

doi:10.14500/aro.10739

Mohammad H. Jannaty Department Of Civil Engineering, Islamic Azad University, Sanandaj Branch, Iran. https://orcid.org/0000-0002-5301-8330
Dawood Atrushi Department of Civil Engineering, College of Engineering, University of Duhok, Duhok, Kurdistan Region- F.R. Iraq https://orcid.org/0000-0003-0609-9964

Keywords: Compressive strength, Curing conditions, LWAC, Ultrasonic pulse velocity, Weathering Expanded polystyrene

Abstract

At present, most of the generated waste expanded polystyrene (EPS) in developed countries are transported to landfill and in some developing and/or less-developed countries such as Iraq are sent to open landscapes; consequently, this inadequate waste disposal can be very dangerous to our health and environment. This study describes engineering properties of sustainable lightweight aggregate concrete (LWAC) incorporating novel aggregates of waste EPS produced by a unique recycling technique of densifying. The new recycling technique significantly improved the segregation resistance of EPS beads in concrete as these beads are ultra-light material. The novel LWA of densified EPS (DEPS) was used as partial natural aggregate replacement in the mixes. Three water/cement (W/C) ratios were used. Three different types of curing conditions of indoor full water curing, outdoor weathering exposure, and heating exposure were employed during this study to represent different conditions which concrete may be subject to. The engineering properties of concrete investigated were consistency, dry density, compressive strength, and ultrasonic pulse velocity (UPV) for long-term performance of more than one-year age. It was indicated that the properties of concrete were not only primarily influenced by the employed curing conditions but the content of DEPS in the mixtures and additionally the W/C ratio had effect on the properties of concrete. However, adequate engineering properties can be achieved using an appropriate amount of DEPS with proper W/C and curing conditions.

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Author Biographies

Mohammad H. Jannaty, Department Of Civil Engineering, Islamic Azad University, Sanandaj Branch, Iran.

Mohammad Hemen Jannaty is Assistant Professor of Water Civil Engineering in Islamic Azad University of Sanandaj Branch. He completed his doctorate at the Islamic Azad University of Science and Research Branch, Tehran in 2017. In recent years, he has been in charge of many research projects and supervised many master and PhD students in the field of water engineering and Structure engineering. He is also the author of one book of fluid mechanics. He has devoted his academic career to study of the integrated water resources management, river engineering, sediment, scouring, technology of concrete and experimental design. Dr. Mohammad Hemen Jannaty has more than 10 years teaching experience and has published many academic papers and final research reports. Nowadays he is Group Manager of Civil engineering in Islamic Azad University of Sanandaj Branch.

Dawood Atrushi, Department of Civil Engineering, College of Engineering, University of Duhok, Duhok, Kurdistan Region- F.R. Iraq

Dawood S. Atrushi is a lecturer in the Department of Civil Engineering at the University of Duhok where he has been a faculty member since 2004. Dr. Atrushi completed his PhD and undergraduate study at the Norwegian University of Science and Technology. His research interests lie in the area of mechanical properties of the young concert, ranging from theory to design to testing. The core of his research area has been a creep. In recent years, his focus has been directed to Eurocods in addition to Fiber Reinforced Polymers. He has a long international experience from the industry and in teaching. In addition, he has many year of experiences in higher education management.

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