Glow-in-the-dark Pathways and Transportation Materials: A Synthesis of Currently Available Technologies, Completed Projects, and Associated Costs
Blythe Carter, North Carolina State UniversityShow Abstract
Sarah O'Brien, UNC Highway Safety Research Center
High profile glow-in-the-dark (GITD) pathway and highway projects have stimulated public interest in incorporating GITD materials to increase safety, beautify pathways, and potentially substitute street lighting. This assessment is a synthesis of available literature regarding GITD transportation materials, including chemical properties and safety of luminescent compounds, currently available products, recent projects, and construction methods. The synthesis is intended to assist agencies in determining whether these surfaces align with project goals and expectations by providing a non-biased summary of available technologies and their associated costs as informed by preliminary performance evaluations of existing facilities. Available peer-reviewed research, news articles, local agency interviews, and vendor guidelines and specifications sheets were utilized. Of the two primary luminescent compounds available strontium aluminate compared better. Materials cost estimates per 1000 ft. length of 10 ft. wide pathway ranged from $5,000 (application of a single line of GITD paint to center of path) to $400,000 (full coverage of luminescent “glow stones” embedded into a new concrete surface). Peer-reviewed evaluations of current public projects were not found to objectively determine what is anecdotally believed or reported by vendors that the glow of all applications is not bright enough to serve as a street light substitute but does make pathways more visible in the dark and serves a pathway beautification function by making interactive surfaces which could attract more visitors. More research into user perceptions, performance of materials in variable environmental conditions, and evaluations of material longevity is required to better quantify the benefits of GITD additives.
A Compatible Swarm Intelligence Model and Construction Method to Satisfy Bridge Design and Load Rating Requirements
Chad William Harden, Michael Baker International, Inc.Show Abstract
This paper details the novel combination of a population-based swarm intelligence algorithm, structure mechanics, and a specific construction staging methodology, to propose an autonomous construction system which can erect a bridge over arbitrary crossing geometry while satisfying project constraints and conventional design code requirements (“The Proposal”). The fields of metaheuristic applications in structures, unmanned aerial systems, and additive manufacturing are each independent innovations in the transportation industry. The Proposal brings these fields together, with a vision that independent drone robots with very basic programming could construct a bridge with no user interruption and without performing a conventional structural design. A simulation as proof-of-concept is compared to a modern bridge design; the result is a modest increase in materials with an anticipated dramatic savings in labor. The Proposal has promise where socio-economic issues may be a factor, such as construction of infrastructure in remote locations or developing nations, and emergency repair or replacement of bridges.
PERSONALIZED SAFETY INSTRUCTION SYSTEM FOR CONSTRUCTION SITE IN THE INTERNET ERA
Ning Tang, Shanghai Jiao Tong UniversityShow Abstract
Hao hu, Shanghai Jiao Tong University
Feng Xu, Shanghai Jiao Tong University
Fengfeng Zhu, Shanghai Jiao Tong
Safety instruction plays a critical role on construction sites, and its ultimate goal is to ensure the safety of workers. However, existing safety instruction cannot protect individual onsite workers effectively. Traditional safety management relies mainly on the regulation and supervision by a small number of on-site managers. Safety instruction received by workers are usually not timely and precise. To change this situation, this paper proposes a Personalized Safety Instruction Management (PSIM) system based on whole system thinking. Its conceptual modeling and system function are developed based on user-oriented interactive design. Based on the design idea, the authors designed the collection, retrieval, and processing of project information used in the PSIM system according to 5W1H method. Finally, the application of the PSIM system is demonstrated through a high-speed railway construction project. The results of the experiment are certified by experts, which shows that the real-time personalized safety instruction of workers can be realized at a reasonable cost based on cloud computing and GPS positioning technology. The system utilized up-to-date technology such as real-time location technology and cloud computing, and presented in the form of mobile APP and web interface. This authors have changed the conventional method of safety instruction and created a safer environment for construction workers. The conception of PSIM system based on Internet platform is a test of the progressive evolution of quality managerial systems, with a potential of application in different industries, such as quality inspection and job training.
Low-cost Collaborative Positioning Technology for Pavement Construction Monitoring Based on Global Positioning System and Ultra Wideband System
Tong Jia, Southeast UniversityShow Abstract
Zhen-dong Qian, Southeast University
A low-cost collaborative positioning technology based on Global Positioning System (GPS) and Ultra-Wide Band (UWB) system was proposed for the rolling positioning and the numbers of passes for pavement construction monitoring. The civil GPS system is used to track the rollers for numbers of passes, and obtain the information of velocity and azimuth. The UWB system is used to acquire the locations of the rollers for rolling positioning. The collaborative positioning system was designed, and an optimization algorithm based on Kalman Filtering algorithm was proposed to improve the positioning accuracy. The tracking and positioning experiments were carried out at a larger open parking lot. The results show that the accuracy of civil GPS module could be improved to 1m, but still unavailable for rolling positioning. The accuracy of UWB system reaches decimeter level, but the possitioning area is limited by wireless communication distance. The collaborative system improves the average accuracy to 0.48m with a sufficiently large ranging area. Taking advatages of both positioning subsystems, the collaborative technology based on GPS and UWB meets the requirements of pavement construction monitoring with a lower cost.