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N. Gozde Ozerkan worked as an Assistant Professor in the Center for Advanced Materials in Qatar University. She received her BSc in Civil Engineering from the Cukurova University, Turkey, in 2002. She received her MSc in January 2006 and Ph.D. in October 2009 from Middle East Technical University, Turkey, both in Civil Engineering. She has extensive experience in mechanics of construction materials, nondestructive evaluation techniques, material science, image processing, construction materials testing procedures, life cycle assessment and recycling.
Worldwide, there is a growing level of interest to develop sustainable cement-based products and processes in which the usage of natural resources such as sand and limestone are reduced from the current levels. One of the ways to achieve this is by replacing them with suitable inclusions of recycled granular materials from municipal wastes where possible. However, to understand the effects of such inclusions in concrete structures, research advancements are needed to sense and characterise the distribution of stresses (/strains) at the local scale and to establish their links with the fracture and bulk strength characteristics under external loading environments, which is the focus here. In this research, polyethylene (PE)-based granular materials derived from municipal wastes and fly ash obtained from the incineration of municipal solid wastes are used together as secondary raw materials in preparing the concrete mixtures. Photo stress analysis (PSA) is performed here, making non-contact and whole-field digital measurements of maximum shear stress distribution and the directions of the principal stresses at any point of interest on the surface of the samples under external loading. Their links with the fracture toughness and flexural strength of the samples cured at different times are presented. The novel PSA-based stresssensing helps to establish new understandings of the strength characteristics of composites across scales in the applications involving recycling and reusing conventional wastes and possibly in otherengineering applications in the future.
S. Joseph Antony; George Okeke; D. Deniz G. Tokgoz; N. Gozde Ozerkan. Whole-Field Stress Sensing and Multiscale Mechanics for Developing Cement-Based Composites Containing Recycled Municipal Granular Wastes. Sustainability 2021, 13, 848 .
AMA StyleS. Joseph Antony, George Okeke, D. Deniz G. Tokgoz, N. Gozde Ozerkan. Whole-Field Stress Sensing and Multiscale Mechanics for Developing Cement-Based Composites Containing Recycled Municipal Granular Wastes. Sustainability. 2021; 13 (2):848.
Chicago/Turabian StyleS. Joseph Antony; George Okeke; D. Deniz G. Tokgoz; N. Gozde Ozerkan. 2021. "Whole-Field Stress Sensing and Multiscale Mechanics for Developing Cement-Based Composites Containing Recycled Municipal Granular Wastes." Sustainability 13, no. 2: 848.
This paper presents the effect of freezing-thawing on self consolidating concrete (SCC) that contains different percentages of fly ash (FA) and air entraining agents (AEA). The effect of freezing-thawing on concrete is assessed on the basis of the change in the dynamic modulus of elasticity. The dynamic modulus of elasticity is determined from both ultrasonic pulse velocity and resonant frequency tests. An in-house resonant frequency test apparatus was developed using an accelerometer and a data acquisition system. During the development of the test apparatus, structural eigenvalue analysis was also utilized to understand if the correct modal frequency of cylindrical test specimens is detected or not. The dynamic modulus of elasticity is then used to compute the durability factor of SCC specimens that are subjected to freezing-thawing cycles. The relationship between durability factor – FA – AEA content was evaluated, and the highest degree of reduction in durability factor was observed at mixes including maximum FA content, and no AEA and maximum AEA content. Furthermore, when FA was used in the range of certain limits, it was observed that SCC specimens were resistant to freezing-thawing cycles.
N. G. Özerkan; Ismail Ozgür Yaman. Use of Dynamic Modulus of Elasticity to Assess the Durability of Self Consolidating Concrete. High Performance Fiber Reinforced Cement Composites 6 2011, 303 -308.
AMA StyleN. G. Özerkan, Ismail Ozgür Yaman. Use of Dynamic Modulus of Elasticity to Assess the Durability of Self Consolidating Concrete. High Performance Fiber Reinforced Cement Composites 6. 2011; ():303-308.
Chicago/Turabian StyleN. G. Özerkan; Ismail Ozgür Yaman. 2011. "Use of Dynamic Modulus of Elasticity to Assess the Durability of Self Consolidating Concrete." High Performance Fiber Reinforced Cement Composites 6 , no. : 303-308.