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Others
01 March 2020 - 30 August 2021
Post Doctoral Researcher
01 January 2014 - 01 November 2016
Others
01 April 2010 - 01 April 2011
Graduate Student or Post Graduate
01 February 2004 - 01 June 2013
D. Deniz Genc Tokgoz is an Assistant Professor at Hacettepe University, Turkey. She received her MSc and PhD in environmental engineering from Middle East Technical University, Ankara, Turkey. She worked as a post-doc researcher at Qatar University. She has a multidisciplinary scientific background. Her research interests include atmospheric and aerosol sciences, air pollution monitoring, solid waste management, recycling, and waste utilization.
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.
Fracture toughness measures the resistance of a material to fracture. This fundamental property is used in diverse engineering designs including mechanical, civil, materials, electronics and chemical engineering applications. In spite of the advancements made in the past 40 years, the evaluation of this remains challenging for extremely heterogeneous materials such as composite concretes. By taking advantage of the optical properties of a thin birefringent coating on the surface of opaque, notched composite concrete beams, here we sense the evolution of the maximum shear stress distribution on the beams under loading. The location of the maximum deviator stress is tracked ahead of the crack tip on the experimental concrete samples under the ultimate load, and hence the effective crack length is characterised. Using this, the fracture toughness of a number of heterogeneous composite beams is evaluated and the results compare favourably well with other conventional methods using combined experimental and numerical/analytical approaches. Finally a new model, correlating the optically measured shear stress concentration factor and flexural strength with the fracture toughness of concretes is proposed. The current photonics-based study could be vital in evaluating the fracture toughness of even opaque and complex heterogeneous materials more effectively in future.
S. Joseph Antony; George Okeke; D. Deniz Genc Tokgoz; N. Gozde Ozerkan. Photonics and fracture toughness of heterogeneous composite materials. Scientific Reports 2017, 7, 4539 .
AMA StyleS. Joseph Antony, George Okeke, D. Deniz Genc Tokgoz, N. Gozde Ozerkan. Photonics and fracture toughness of heterogeneous composite materials. Scientific Reports. 2017; 7 (1):4539.
Chicago/Turabian StyleS. Joseph Antony; George Okeke; D. Deniz Genc Tokgoz; N. Gozde Ozerkan. 2017. "Photonics and fracture toughness of heterogeneous composite materials." Scientific Reports 7, no. 1: 4539.
D. Deniz Genc Tokgoz; N. Gozde Ozerkan; O. Samir Kowita; S. Joseph Antony. Strength and Durability of Composite Concretes with Municipal Wastes. ACI Materials Journal 2016, 113, 669 -678.
AMA StyleD. Deniz Genc Tokgoz, N. Gozde Ozerkan, O. Samir Kowita, S. Joseph Antony. Strength and Durability of Composite Concretes with Municipal Wastes. ACI Materials Journal. 2016; 113 (5):669-678.
Chicago/Turabian StyleD. Deniz Genc Tokgoz; N. Gozde Ozerkan; O. Samir Kowita; S. Joseph Antony. 2016. "Strength and Durability of Composite Concretes with Municipal Wastes." ACI Materials Journal 113, no. 5: 669-678.
D. Deniz Genc Tokgoz. Assessment of microstructural and mechanical properties of hybrid fibrous self-consolidating concretes using ingredients of plastic wastes. 2016, 1 .
AMA StyleD. Deniz Genc Tokgoz. Assessment of microstructural and mechanical properties of hybrid fibrous self-consolidating concretes using ingredients of plastic wastes. . 2016; ():1.
Chicago/Turabian StyleD. Deniz Genc Tokgoz. 2016. "Assessment of microstructural and mechanical properties of hybrid fibrous self-consolidating concretes using ingredients of plastic wastes." , no. : 1.
D. Deniz Genc Tokgoz; N. Gozde Ozerkan; Osama Kowita; S. Joseph Antony. Durability and Microstructure of Cement Composites Containing Qatar's Municipal Wastes. Qatar Foundation Annual Research Conference Proceedings Volume 2016 Issue 1 2016, 1 .
AMA StyleD. Deniz Genc Tokgoz, N. Gozde Ozerkan, Osama Kowita, S. Joseph Antony. Durability and Microstructure of Cement Composites Containing Qatar's Municipal Wastes. Qatar Foundation Annual Research Conference Proceedings Volume 2016 Issue 1. 2016; ():1.
Chicago/Turabian StyleD. Deniz Genc Tokgoz; N. Gozde Ozerkan; Osama Kowita; S. Joseph Antony. 2016. "Durability and Microstructure of Cement Composites Containing Qatar's Municipal Wastes." Qatar Foundation Annual Research Conference Proceedings Volume 2016 Issue 1 , no. : 1.
In this study, ionic compositions of 350 aerosol samples collected between April 2006 and May 2008 in a rural area at Northwestern Turkey (Black Sea coast of Turkey) were discussed. Ions accounted for approximately 30% of PM mass. Contributions of secondary aerosol species (NO
D. Deniz Genc Tokgoz; Güray Doğan; N.A. Lhan; Tülay Balta; Gürdal Tuncel. Ionic composition of aerosols at Northwestern Turkey. International Journal of Global Warming 2015, 7, 161 .
AMA StyleD. Deniz Genc Tokgoz, Güray Doğan, N.A. Lhan, Tülay Balta, Gürdal Tuncel. Ionic composition of aerosols at Northwestern Turkey. International Journal of Global Warming. 2015; 7 (2):161.
Chicago/Turabian StyleD. Deniz Genc Tokgoz; Güray Doğan; N.A. Lhan; Tülay Balta; Gürdal Tuncel. 2015. "Ionic composition of aerosols at Northwestern Turkey." International Journal of Global Warming 7, no. 2: 161.
Spatial and temporal variations in concentrations of CO, NO, NO(2), SO(2), and PM(10), measured between 1999 and 2000, at traffic-impacted and residential stations in Ankara were investigated. Air quality in residential areas was found to be influenced by traffic activities in the city. Pollutant ratios were proven to be reliable tracers to differentiate between different sources. Air pollution index (API) of the whole city was calculated to evaluate the level of air quality in Ankara. Multiple linear regression model was developed for forecasting API in Ankara. The correlation coefficients were found to be 0.79 and 0.63 for different time periods. The assimilative capacity of Ankara atmosphere was calculated in terms of ventilation coefficient (VC). The relation between API and VC was investigated and found that the air quality in Ankara was determined by meteorology rather than emissions.
D. Deniz Genc Tokgoz; Canan Yesilyurt; Gürdal Tuncel. Air pollution forecasting in Ankara, Turkey using air pollution index and its relation to assimilative capacity of the atmosphere. Environmental Monitoring and Assessment 2009, 166, 11 -27.
AMA StyleD. Deniz Genc Tokgoz, Canan Yesilyurt, Gürdal Tuncel. Air pollution forecasting in Ankara, Turkey using air pollution index and its relation to assimilative capacity of the atmosphere. Environmental Monitoring and Assessment. 2009; 166 (1-4):11-27.
Chicago/Turabian StyleD. Deniz Genc Tokgoz; Canan Yesilyurt; Gürdal Tuncel. 2009. "Air pollution forecasting in Ankara, Turkey using air pollution index and its relation to assimilative capacity of the atmosphere." Environmental Monitoring and Assessment 166, no. 1-4: 11-27.