Applied Mechanics and Materials Vols. 752-753

Abstract: Taiwan's National Freeway plays an important role in Taiwan's transportation, it is convenient to go to anywhere through a series of north-south and east-west road networks, from this we can see, the freeway road quality is a project that always need to be concerned, and how to enhance the pavement quality of National Freeway will be the main subject of this study.In order to improve the comfort index of National Freeway in this study, we first understand the examination part of National Freeway, like road testing items and methods, and because the need of study, we need to organize the relevant information of National Freeway road comfort index and investigation processes, with the investigation and analysis processes, it is beneficial to maintain and enhance the comfort quality of National Freeway.

Abstract: Geological CO₂ sequestration is a promising method to reduce atmospheric CO₂. Deep saline aquifers are one of the most important sites due to their capacity for CO₂ storage. Thus, a better understanding of immiscible brine-CO₂ mobility and their saturations including invading patterns in deep saline aquifers as CO₂ storage sites is required. Microfluidic model provides the opportunity to discover unrecognized processes and to explore existing theories in fluid flow through porous media. In this study, the microfluidic model is used to explore the effects of both the supercritical carbon dioxide (scCO₂) injecting velocity and ionic strength in saline aquifers on scCO₂ invading patterns in geological CO₂ sequestration. The results show that scCO₂-brine displacement ratio increases with (1) increased scCO₂ injecting velocity up to 40 μL/min, and (2) decreased ionic strength in the range of 1M~5M NaCl.

Abstract: The objective of this paper is to present a brief report of a project for water recycling and treatment for a second use applied at the Academic Unit of Amecameca, part of the Autonomous University of the State of Mexico (UAEMex). It presents the local problems that gave origin to the project as well as the development and structure of the system developed for such project. Finally it presents the lessons learned from its development as well as further venues of research for new developments and improvements. It is the researchers' consideration that this project can represent a viable option for sustainable use of residual water in remote locations.

Abstract: Article proposes a comprehensive approach to the formation of the program sequence surveys of industrial buildings equipped with overhead cranes. Authors formalized synthesis algorithm that reveals the concept essence of the probabilistic method application to the study of changes in the stress-strain state of the industrial building frame during its operation taking into account the variability impacts. The calculation of the reliability and durability is based on the method of limiting states. The implementation of this method makes it possible to take into account the random nature of not only the combination of existing loads, but also the strength properties of building materials by constructing a system of safety factors.

Abstract: Heinrich (1980) claimed that safety education primarily relates with 88 percent of safety accidents, and secondarily relates with safety accidents. For this reason, safety education is of critical importance. However, while many studies have been performed on safety education in Korea for the prevention of safety accidents, few studies have been done on safety education currently performed in other countries. Therefore, in this study, a comparative analysis was conducted on the safety education cases of three different construction companies that are currently carrying out overseas construction projects. With this study, we identified four shared features and some differences in the safety education of each company.

Abstract: While safety in the construction industry has been acknowledged as an important issue, there has yet to be a decrease in the number of disasters. For this reason, to manage and control construction disasters, a study should be conducted on the distribution and use of money allocated to safety management at construction sites. Thus, through an analysis of the current state of safety management cost, a distribution plan was sought, by accident type. In this study, the current state of accidents and safety management cost of four construction sites were analyzed. In the findings of this study, it was found that crash accidents, which have been reported as the accident type most frequently occurring, can be cut by increasing the safety facility cost for the prevention of crashes by more than 50 percent

Abstract: Since recently almost all housing built in Korean have shared walls and floor, diverse problems are unavoidable including noise between floor arising from noise and vibration. Many efforts have been made by the Korean government, but the number of complaints related with the noise between floors has been gradually increasing. Therefore, through the field measurements by house type, the current state of noise was understood. To do this, the noise between floors was measured in an apartment household and a multiplex house to perform a comparative analysis. As the result, the differences in the noise between the two house types were clarified. The findings of this research are expected to contribute to reduction of the noise between floors in an apartment building in the future.

Abstract: Magnetic flux leakage (MFL) testing is widely used to inspect and characterize defects in storage tank floors, pipelines and other structures. In this paper, magnetic flux leakage testing technology is applied to the horizontal product oil underground tank wall inspection. The artificial defects were prefabricated on the tank wall such as corrosion pits, grooving and other artificial defects to simulate the corrosion, cracks and other actual defects in actual working conditions. The experimental research of the mutual influence between magnetic flux leakage and defects’ parameters were carried out, such as the depth and width of cracks, and depth and diameter of corrosion pits. Then the relationship between the defect’s parameter and magnetic field amplitude was obtained. The experimental results showed that, whether corrosion or crack, the depth is a very important factor affecting the leakage magnetic field amplitude. Especially for crack, width, length and the inclination angle between crack and magnetic field had great influence on the detection of the cracks, and too small angle to lead to misjudgment and undetected of crack. Therefore, single direction inspection may lead to undetected in engineering practice.

Abstract: In Korea, construction accidents have been constantly increasing. Construction laborers have higher hazard rates and higher work intensity than other industries, which mean that they experience more job stress. The job stress has risk to have a negative impact on their safety at site. While the number of foreign laborers has increased, there are few studies about the stress of them. Therefore, this study proposed a safety management method based on job stress analysis for foreign construction laborers in Korea. A questionnaire to measure job stress was performed targeting foreign laborers, and the results were analyzed. The results of this study can be utilized to preventing construction accidents related to job stress in the future.

Abstract: This paper presents a case of repair practice for a concrete bridge that was classified as imminent failure condition. The bridge is slab-type with an equal span of 10 meters long. Each pier is built up of six driven concrete piles. Over 30 years, critical deterioration occurred to concrete pier columns with many severe corrosion spots on reinforcing bars. A concept of section replacement was used to develop a repair technique to remove an entire body of deteriorated materials and restore with selected new materials, was used to develop a repair method. The method involved several stages of works that included: site investigation, damage inspections; work area preparation and installation of temporary structure; material replacement; and work completion. The lesson learned from repair practice suggests the number of key success factors to complete the task safely and cost effectively in a timely way.