Journal Papers
M. Khooshechin Gilak, R. Shabani, ”Durability and ageing behaviour of asphalt mixtures modified by hydrophobic and hydrophilic Nano-Alumina”, Construction and Building Materials, 2023.
(In Preparation)
Abstract
The resistance of Asphalt Concrete (AC) to climatic conditions such as aging and moisture damage can be defined as the durability of asphalt concrete. To meet the durability requirement of asphalt concrete, the asphalt must be hard enough at the highest pavement temperature to resist deformations. It should also be flexible enough and strong enough to resist cracking at the lowest coating temperature (down to about -20°C depending on local climate). There is a consensus among asphalt researchers that modifiers have a significant impact on the performance of asphalt binders and can extend the service life of pavement binders. In recent years, the use of nano modifiers in asphalt concrete and other bituminous materials has been investigated by many researchers. Research shows that Nanomaterials can improve the mechanical performance of asphalt concrete. However, there are few studies investigating the effect of nanomaterials on the aging behavior and durability of asphalt mixtures. In this study, Nano Alumina was chosen to change the rheological and physical properties of the asphalt binder and thus the asphalt concrete. Two types of nano alumina were used in this research: Hydrophobic and hydrophilic. The influence of surface hydrophilicity/hydrophobicity on the rheology, aging behavior, and durability of Nano-Alumina modified asphalt mixtures have never been demonstrated before. Three nano-alumina content (5%, 7%, and 9%) was used for the modification of 50/70 and SBS-modified asphalt binders. Permanent Marshal stability testing (after prolonged aging of the mixes), moisture damage, and low-temperature failure are tests to be applied to asphalt concrete samples to investigate the effect of different types of nano alumina on different mixes. Scanning electron microscopy (SEM), Fourier-transform infrared (FTIR), Dynamic mechanical analysis (DMA), and BBR (Bending beam rheometry) are tests used to evaluate the effect of different types of nano alumina on the rheology of aged and unaged asphalt.
Abstract
In recent decades finished and semi-finished commodities are the most common and fastest-growing cargo categories for transportation in Europe. These commodities usually have low density and are of high value. This paper aims to assess the CO2 emissions, cost, and availability of road, rail, and railroad intermodal transportation used to deliver LDHV goods in a case study involving chemical goods transportation throughout the EU27 countries in 2020. The findings indicated that most chemical goods were transported via road, which emits more CO2 than a railway. Furthermore, road transport cost is significantly higher than rail. In order to reduce CO2 emissions and costs, four railroad intermodal scenarios were suggested. According to the analysis, these scenarios for delivering LDHV goods may be feasible to mitigate environmental concerns while also significantly lowering costs. Additionally, the availability and accessibility of intermodal terminals for shipping LDHV goods were analyzed to evaluate these scenarios.
Abstract
Studying the application of nanomaterial in cement matrixes is a new subject which has attracted the attention of researchers. Development of engineered cementitious composite has produced a solution to numerous shotcrete application challenges. In this study, mechanical tests were conducted to evaluate the strength of the concrete modified by fibers and nanomaterials in terms of comparison with conven- tional concrete and shotcrete.
It is included in the application of Nano-Al2O3 and Nano-SiO2, which are some of the cement con- stituent. With proper homogenization, Nano-Al2O3 acts as filler for improving the pozzolanic reaction in the concrete. Nano-SiO2 particles also prevent the diffusion of external destructive factors into the con- crete, thus improving the durability and stability of concrete. On the other hand, application of Alkali Resistant (AR) glass fibers improves the tensile and compressive strengths as well as concrete continuity and also resolves the changes created in mechanical properties of the fibers caused by alkaline concrete environment. Test results revealed that the maximum increase in compression and flexural strengths of modified concrete were 20.6 and 52%, respectively of its optimum compounds for 0.7% glass fiber with 1% Nano-Al2O3 and 1.5% Nano-SiO2, while in the modified shotcrete, these values were increased by 22.9 and 75%, respectively. In addition, application of the mentioned materials led to decrease of penetration depth and water absorption of the modified concrete by 46.78 and 2.5%, respectively, in relation to the conven- tional concrete. Also, addition of fibers and nanomaterials in shotcrete reduced the effect of cracking due to shrinkage and the modified shotcrete material rebound.
Conference Papers
M. Khooshechin Gilak, ”A compressive review on performance of asphalt binder and asphalt mixtures modified with Nano-Alumina”, 2023. (In Preparation)
Abstract
This paper provides a comprehensive review on the performance of asphalt binder and asphalt mixtures modified with nano-alumina. The use of nano-alumina as an asphalt modifier has gained significant attention in recent years due to its superior properties, such as high surface area, good thermal stability, and mechanical strength. The review covers various aspects of the modification process, including preparation methods, characterization techniques, and performance evaluation of modified asphalt. The paper also discusses the effects of nano-alumina modification on asphalt properties such as stiffness, fatigue, rutting, and moisture susceptibility. The review identifies that the addition of nano-alumina can enhance the mechanical and rheological properties of asphalt binder and asphalt mixtures, leading to improved performance under various loading and environmental conditions. However, the optimal dosage and dispersion of nano-alumina in asphalt matrices require further investigation. The review concludes that nano-alumina modification has the potential to improve the performance of asphalt pavements, and further research is needed to fully understand its effects and optimize its use in asphalt pavement engineering.
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Abstract
Today's intensified travel flows and the issues associated with them force airports to implement more advanced identity and security systems. One of the profitable artificial intelligence technologies that can be utilized in this regard is facial recognition. This research aims to find the articles that are most related to the topic of face recognition technology utilized in airports by use of a systematic mapping review. The methodology utilized in this article comprises three procedures; defining research questions, research process, and filtering process. Finally, these papers were thoroughly evaluated, analyzed, and classified in order to address eight Analytical and statistical questions. This study proposes a two-level taxonomy of the literature for the application of facial recognition in airports. The first level classification is structured into three primary categories; Identity, security, and security-identity. Furthermore, there are four subcategories for facial recognition application in airports; security cameras, check-in, border control, and airports' staff access control. Identity is the main category with the most papers and security cameras rank first in the ranking of subcategories. Furthermore, different algorithms and systems that had been utilized by scholars to enhance the efficiency of airports facial recognition systems are mentioned, as well as benefits outcomes and limitation of the proposed algorithm or system. The results also show that researchers mainly focus on proposing a new method for increasing the efficiency of face recognition technology in airports, indicating that there is more room for qualitative studies that focus on other aspects of airport face recognition.
Abstract
The tunnel excavation site experiences natural stress before drilling, which results in a specific distribution of stresses. However, this distribution changes after excavation, leading to deformations in the surrounding area and the ground surface. Therefore, determining the stress distribution and displacement in the vicinity of the tunnel is crucial for assessing its destructive effects on buildings and facilities on the ground. In this regard, various estimation methods are used to determine the horizontal stress values. Subsequently, numerical analysis is conducted for a sample circular tunnel based on two different models: the plate strain model and the three-dimensional strain model. FLAC3D software is employed to compare the results of the two models. The conclusion is drawn that the deformation caused by the three-dimensional strain model is lower than that of the plate strain model.
BOOK
J.Tanzadeh, M.Khooshechin Gilak,
Principles of tunnel designing”,
Kadusan Publication, Rasht, Iran, 2019, In Farsi,
ISBN: 9786226206136.
About
Principles of tunnel designing book meets the needs of civil engineering and geotechnical engineering students. The book introduces rock mechanics and its classification, which includes the basics of tunnel designing and underground structures .Also, in this book we analyze stress and strain around underground structures .In addition failure models and numerical methods of tunnel stability are explained.