Frontiers Research of Architecture and Engineering

The Role of Geotechnical Engineering in Photovoltaic Solar Photovoltaic Energy in Arid Climate Regions

Abdulla AL-Rashidi — 2022-08-10

The photovoltaic solar energy is comprised of many engineering disciplines. Geotechnical engineering is one of those disciplines in which it has important functions in the solar photovoltaic technology and particularly for large scale projects which usually employed in open areas such as parks or deserts. The aim of this paper is to present in depth the role of the geotechnical engineering in the solar photovoltaic energy and clarifying the common challenges facing this technology in arid climate regions. It is found that the lack of specialised codes and specifications that needed for foundation design and in selecting the proper foundation types. This would significantly affect the development of this technology in terms of efficiency and performance of the proposed solar photovoltaic systems. The hot weather climate and induced stresses by wind speed are also critical issues that should be considered. In order to avoid the uncertainty of data such as soil properties, the use of numerical modelling techniques is an effective method to help determining the most proper parameters needed for design and analyse purposes.

DCLR Modifi ed Petroleum Asphalt Optimization and Mixture Road Performance

Yifan Chu — 2022-11-01

In recent decades, modifi ed asphalt materials have been used in enhancing the traffi c load on the roads. The main objective of this paper is to explore the modifi cation eff ect of direct coal liquefaction residue (DCLR) on as- phalt binders and investigate the eff ectiveness of DCLR in improving the performance of asphalt road. This paper prepared modifi ed petroleum as-
phalt under diff erent process conditions and tested its penetration, softening point and ductility index. Based on the experimental data, according to gray correlation degree, the performance for the asphalt was compared. The performance for the modifi ed asphalt is simulated and predicted using poly-nomial functions. The modifi ed asphalt was analyzed by FT-IR, TGA, SEM and HPLC. The results show that the optimal process conditions for DCLR modifi ed asphalt are shear mixing time of 45 min, shear mixing tempera- ture of 150 °C and shear mixing rate of 4000 r/min. The predicted fi t with the experimental data of 0.993 further demonstrates the effectiveness of the method. The characterization results show no signifi cantchemical change between the DCLR and the asphalt. DCLR can signifi cantly improve the high temperature performance and water stability of the asphalt, but it has little impact on its low temperature performance.

Analysis of the Relations between Highway Geometric Design and Traffic Safety in Bangladesh, China, and America

Licai Zhang — 2022-11-01

Transportation plays a critical role in the economic sector in Bangladesh. Since its independence, infrastructure has been developing rapidly, including land, water, and air transportation. National economy is increasing at a relatively high rate, leading to the better-off of people’s lives. As the living standards keep improving, people are more concerned about safety issues in transportation. This article makes an analysis of the status quo of traffic safety in Bangladesh and compares the Bangladeshi code with American code AASHTO from the geometric aspects of horizontal and vertical alignment, in an eff ort to provide reference to the highway design in Bangladesh. Through a reasonable design, the traffi c safety will be under control and accident rate as well as economic loss will be minimized.