Browsing by Author "Gurgun, Asli Pelin"

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Citation Count: 39
Approaches for sustainable cement production - A case study from Turkey
(Elsevier Science Sa, 2013) Ekincioglu, Ozgur; Gurgun, Asli Pelin; Engin, Yasin; Tarhan, Muhittin; Kumbaracibasi, Sezgi
One of the keys to achieve the sustainable construction goals in green projects is to select appropriate building materials for construction. Such projects aim to use eco-friendly materials that encourage the consumption of recycled and renewable materials, locally manufactured with less harmful gas emissions with long and durable profiles. Using these eco-friendly materials is also helpful for obtaining higher rates during the application processes of green building certificates. As the demand for sustainable materials increases globally, the construction material producers need to supply materials that can be used in environmentally responsible buildings without compromising ecological conditions. In particular, cement production has a huge impact on the environment because of releasing high amount of CO2 during production processes. This paper aims to express the sustainability of building materials in Turkish construction industry through analyzing cement production of a Turkish cement company where alternative fuels, raw materials, by-products and energy efficient methods are used for sustainable development. (C) 2013 Elsevier B.V. All rights reserved.
Citation Count: 32
Public-Private Partnership Experience in the International Arena: Case of Turkey
(Asce-amer Soc Civil Engineers, 2014) Gurgun, Asli Pelin; Touran, Ali
Public-private partnership (PPP) models are frequently used in construction projects worldwide. The experiences of developed and developing countries vary depending on existing legal, economical, social, and political environments. Although there are some common challenges, risks, limitations, and success factors, practicing PPP framework is also dependent on country-specific factors. In this paper, first the state of the art in frequent PPP practicing regions/countries such as Europe, the U.K., and China are summarized; and a review of PPP experience in the U.S. is presented. Then, Turkey, where different PPP models have been used for nearly three decades, is analyzed in more depth as an example for developing countries. A new PPP law has been drafted to expand the legal context and types of models and overcome the existing limitations since the first introduction of PPP projects in Turkey in early 1980s. An intensive PPP literature survey has been made to present the common success factors, risks, limitations, and challenges in Europe, the U.K., China, U.S., and Turkey as well as understanding the differences in the implementations. A viable economic environment, proper contractual arrangements for appropriate risk allocation, well-established legal basis, public support, transparency, and a central unit to standardize the procedures are determined to be major factors for successful PPP projects. (C) 2014 American Society of Civil Engineers.
Citation Count: 6
SCHEDULE CONTINGENCY ANALYSIS FOR TRANSIT PROJECTS USING A SIMULATION APPROACH
(Vilnius Gediminas Tech Univ, 2013) Gurgun, Asli Pelin; Zhang, Ye; Touran, Ali
This paper presents a probabilistic method to establish schedule contingency levels based on percent completion of the project. The objective is providing a distribution for contingency for various percent completion levels which allows the project owner/manager to choose the schedule contingency at their comfort level. The proposed method is applied on real data from a number of US transit projects and actual schedule overruns for different phases of the project development (preliminary engineering, final design and construction) are analyzed. These values are used to establish the required contingency at the conclusion of each of the mentioned project phases. Additionally, using these values, the required contingency at various points during the construction phase (such as 25% and 50% completion) is calculated and reported. This approach can be used by project owners to plan realistic schedules during various phases of the project, providing better control on duration and the opportunity for being prepared to take necessary action in case the available schedule contingency falls below reasonable levels.