Browsing by Subject "Construction industry"
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Item Utilization of volcanic slag in cement industry from Manisa in Turkey(2012) Aslan A.; Demirbas A.Cement, one of the basic materials of construction engineering, has an important place in view of strength and cost of structure. Cement consumption is increasing parallel to development of building construction sector. For cement producer, minimal cost is desired by using new and economical material source. On the other hand, the controllers and contractors need cheaper, safer and higher strength materials. It is well known that pozzolanics are chemically active silica and alumina bearing materials. There are many different pozzolanic materials. In this study, the volcanic slags from Kula and Gokceoren in Turkey were used as cement additives. The Portland cement clinker and slag were ground together. Normal Portland cement mortar and slag cement mortar were made with a constant water/binder ratio and similar type aggregates. In each slag cement mortar, the slag was 25 percent by weight of cement. The experimental results show that there is a good linear correlation between the Blaine fineness of cement and strengths of mortar. As the fineness of volcanic slag cement increases, the interfacial zone between aggregate and cement paste becomes stronger, as a result both compressive strength increase © Sila Science.Item Major Constructional Dispute Causes in Turkey(De Gruyter Open Ltd, 2016) Yildizel S.A.; Dogan E.; Kaplan G.; Ergut A.The possibility of construction disputes can be reduced, but they cannot be avoided due to the uncertain and risky nature of the building industry. Conflicts between construction parties often have very unfavourable effects, such as cost increases, poor construction quality and time extension in the schedule. Lots of studies have been carried out in order to try and avoid these disagreements. However, there are no common resolution tools or techniques due to the improving conditions and scope of contracted works. Advanced methods and dispute reasons should be fully monitored and updated for the applicable solutions. This paper discusses the current major constructional dispute reasons in Turkey. The questionnaire method was applied within the scope of this study. The questionnaire documents were randomly distributed to 80 contractors to analyse major dispute reasons in Turkey. Analysis of the questionnaire results indicates that the major current dispute causes are poor quality of performed works, delays in progress payments, inefficient site management, poorly written contracts and design mistakes. © 2016 Polish Academy of Sciences.Item Influence of tea waste concentration in the physical, mechanical and thermal properties of brick clay mixtures(Elsevier Ltd, 2019) Ozturk S.; Sutcu M.; Erdogmus E.; Gencel O.The sustainability of raw materials used in construction industry consumed large quantities of material has great importance. The use of pore-makers in the brick production is reducing the consumption of clean clay resources as well as lightness of the baked brick body. Many organic or inorganic additives have been used as pore-making in brick production for improving thermal performance. In this study, tea waste (TW) were used at different concentrations in the brick clay mixtures to examine its effects on baked brick properties. In addition to micro-structure investigations, physical, mechanical and thermal properties of bricks produced were investigated. It is concluded that tea waste additive up to 10% in brick body can be used for structural application and isolation while ratios more 10% tea waste additive for only isolation purposes. Tea wastes can be used as a pore-making additive in the brick production. © 2019 Elsevier LtdItem Thermodynamics analysis of biomass fired brick drying process(Inderscience Publishers, 2021) Dogru A.K.; Camcioglu E.; Ozgener O.; Ozgener L.For drying the bricks used in the construction sector in Turkey, it is estimated that the power needed is 460 MW. Moreover, the estimated energy consumption and produced brick are 2,680,400 MWh/year and 5 million ton per year, respectively. Due to increasing global warming and climate change, the amount of energy consumed per year for drying decreases. As the outdoor temperature increases, the amount of energy supplied for drying the brick will be reduced. This study was carried out because of this high energy consumption during drying process in brick production sector. According to the case study, energy and exergy analyses of a brick factory with an annual production capacity of 150,000 tons in Manisa were conducted using real operating data. The energy and exergy output values and exergy losses for each component of the process and the whole system were analysed according to ambient temperature (0°C–20°C) and changes in drying air temperature (75°C–105°C). The energy efficiency of the system in the range of 27.95%–34.31% exergy efficiency was found in the range of 48.23%–64.90%. Finally, further measures are proposed for increasing efficiency of system exergy and energy. Copyright © 2021 Inderscience Enterprises Ltd.Item Investigation of scaffolding accident in a construction site: A case study analysis(Elsevier Ltd, 2021) Dogan E.; Yurdusev M.A.; Yildizel S.A.; Calis G.The construction sector is one of the few high-risk businesses due to occupational accidents, their rate of frequencies, and related serious consequences, sometimes even resulting in the death of individuals. Therefore, it is a vital necessity and priority for employers and employees during the course of a project to comply with occupational safety rules under any circumstances. Nothing should deter or compromise the safety of any individual working in a potential risk environment. Within the scope of this study, the analysis addresses a scaffolding accident that occurred on a construction site. Once the information about how the accident possibly happened was received, the scaffolding in question identified at the construction was kept for an investigation to carry out the corrective and renovation works. In this paper the suspended scaffoldings are firstly categorized. Then how the accident happened was examined and theorized. The examination and analysis were supported by the results. This study is intended to prevent similar accidents and establish necessary precautions as a matter of procedure. © 2020 Elsevier LtdItem Enhancing thermal efficiency and durability of sintered clay bricks through incorporation of polymeric waste materials(Elsevier Ltd, 2023) Erdogmus E.; Sutcu M.; Gencel O.; Kazmi S.M.S.; Munir M.J.; Velasco P.M.; Ozbakkaloglu T.This pioneering study investigates the use of expanded polystyrene (EPS) and waste rubber tyre powder (WRTP) in sintered clay bricks for eco-friendly and cleaner buildings. Different ratios of EPS and WRTP were mixed with clay and sintered at 1000 °C. Advanced material characterization techniques were used to evaluate the materials, and physical, mechanical, and durability tests were performed on the bricks. The findings show that higher doses of EPS and WRTP increased the bricks' thermal efficiency and reduced their weight. Brick specimens with 0.5% EPS dosage met the weathering resistance requirements, and those with 0.5% EPS dosage and 5% WRTP dosage met the minimum compressive strength standards. The study offers valuable insights into the potential applications of EPS and WRTP in producing clean and sustainable polymer waste bricks to improve brick performance and efficient waste management in the construction industry. © 2023 Elsevier LtdItem Advancing earthquake resistance: Hybrid retrofitting of RC frames with FRP and TDS(Elsevier Ltd, 2024) Suk R.; Demir A.; Altiok T.Y.; Altintas G.Traditional and technological retrofitting methods have been proposed over time to enhance earthquake resistance in structures. Friction-type dampers have attracted considerable interest from both researchers and the construction industry because of their versatility in retrofitting, quick installation, and non-destructive characteristics. Moreover, the integration of damping systems with various retrofitting elements and the resulting impact of these hybrid systems on building performance have consistently been subjects of interest. This study involved the construction of three identical half-scale reinforced concrete (R.C) frames. One frame served as the reference (REF), the second was wrapped with Fiber Reinforced Polymers (FRP) material (REF-FRP), and the third was retrofitted using both FRP wrapping and the developed Technological Damper System (TDS-FRP). Quasi-static cyclic experiments were performed on the three structural frames, providing force-displacement and force-rotation relationships. The acquired data were then used to assess the damage states of the frames according to the Turkish Building Earthquake Code (TBEC 2018), and energy consumption rates were determined. Moreover, Finite Element Method (FEM) analyses were performed on REF, REF-FRP, and TDS FRP frames to derive force-displacement relationships, which were subsequently compared with experimental findings. The experiment results indicate that the horizontal load-carrying capacity of the TDS-FRP frame increased by 76 % to 122 % compared to the REF frame, while the REF-FRP frame showed a maximum increase of 14 %. Additionally, the cumulative energy consumption capacity of the REF-FRP frame increased by a maximum of 42 % compared to the REF frame, and the TDS-FRP increased between 51 % and 156 %. At a 1 % drift ratio, shear cracks at the beam ends and column-beam intersections of the REF frame were observed to be significantly reduced in the REF-FRP frame and eliminated in the TDS-FRP frame. Additionally, upon reaching a 3 % drift ratio, it was observed that the TDS-FRP frame remained within acceptable limits as per TBEC 2018, whereas the REF and REF-FRP frames exceeded the advanced damage limit. Additionally, it has been observed that the results obtained from FEM analyses coincide with the experimental results. In this context, the TDS-FRP hybrid application can be considered as an effective and alternative solution for the R.C buildings. © 2024 Institution of Structural EngineersItem Machine learning approach to predict the mechanical properties of cementitious materials containing carbon nanotubes(Elsevier Ltd, 2024) Okasha N.M.; Mirrashid M.; Naderpour H.; Ciftcioglu A.O.; Meddage D.P.P.; Ezami N.This research explores the use of machine learning to predict the mechanical properties of cementitious materials enhanced with carbon nanotubes (CNTs). Specifically, the study focuses on estimating the elastic modulus and flexural strength of these novel composite materials, with the potential to significantly impact the construction industry. Seven key variables were analyzed including water-to-cement ratio, sand-to-cement ratio, curing age, CNT aspect ratio, CNT content, surfactant-to-CNT ratio, and sonication time. Artificial neural network, support vector regression, and histogram gradient boosting, were used to predict these mechanical properties. Furthermore, a user-friendly formula was extracted from the neural network model. Each model performance was evaluated, revealing the neural network to be the most effective for predicting the elastic modulus. However, the histogram gradient boosting model outperformed all others in predicting flexural strength. These findings highlight the effectiveness of the employed techniques, in accurately predicting the properties of CNT-enhanced cementitious materials. Additionally, extracting formulas from the neural network provides valuable insights into the interplay between input parameters and mechanical properties. © 2024 The Authors