Simulation and preparation for hollow slab of solar
pavement with light guide concrete
(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2020年1期
- Page:
- 87-98
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Simulation and preparation for hollow slab of solar
pavement with light guide concrete
- Author(s):
- ZHA Xudong; WANG Ziwei; HU Hengwu; ZHANG Chengjian
- School of Traffic and Transportation Engineering, Changsha University of Science and
Technology, Changsha 410114, Hunan, China
- Keywords:
- road engineering; light guide concrete; mechanism simulation; solar pavement; hollow slab; model preparation; performance test
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to explore a reasonable type of solar pavement structure, a kind of rectangular hollow slab structure of light guide concrete with builtin arch chamber, light guide bodies and solar cell was proposed. Each light guide body was an integral structure composed of a planeconvex lens, a truncated coneshaped prism and a cylindrical light guide fiber. The planeconvex lenses as light input terminals were arranged on the surface of hollow slab at equal intervals, and the bottom surfaces of light guide fibers as light output terminals were gathered at the vault of arch chamber. Thus, the light energy on road surface could be converged, transmitted and projected onto the builtin solar cell for photovoltaic power generation. Firstly, the loading features of hollow slab pavement structure were simulated through building the threedimensional finite element model, then the suitable length, width and height of hollow slab structure to meet the requirements of bearing capacity were determined to be 50, 50, 17 cm respectively, and the arch width, floor thickness, arch height and roof thickness were 26, 5, 5 and 7 cm respectively. Secondly, the propagation laws of light path for the light guide body were simulated with the light ray tracing method, and the design parameters of light guide body were optimized and selected in accordance with the light guide performance and economy, the radius and refractive index of light guide optical fiber were 3.5 mm and 1.6 respectively, the radius and thickness of planeconvex lens were 10.5 and 4.2 mm respectively, and the height and surface reflectivity of prism were 31.1 mm and 1.0, respectively. Lastly, the preparation process of hollow slab model was put forward for the solar pavement with light guide concrete, and the corresponding hollow slab specimens were prepared with the selfcompacting water proof concrete and the polymethyl methacrylate light guide bodies to test their mechanical properties and power generation efficiency. The results show that the maximum tensile stresses and the maximum vertical displacements of the hollow slab pavement structure increase significantly with the increase of arch width, but decrease gradually with the increase of floor thickness, arch height and roof thickness. The hollow slab specimen is small in the maximum vertical displacement and high in the mechanical strength. The light guide optical fiber radius and the planeconvex lens radius have significant influences on the total solar energy of single day transmission of light guide body, but the influences of planeconvex lens thickness, height and surface reflectivity of prism and refractive index of light guide optical fiber are smaller. The more the number of light guide bodies in the hollow slab specimen, the higher the working voltage and the maximum output power, so the corresponding light guiding and concentrating effects are better, but in order to ensure the mouldability and integral strength of hollow slab concrete, the number of light guide bodies should be selected as 81. The annual power generation per square meter of hollow slab specimen is about 50 to 90 kw·h, and its increased costs can be recovered in 5 to 10 years with better overall economy and fine social and environmental benefits. Therefore, the structure can meet the dual function requirements of driving and power generation to provide a kind of feasible scheme for the researches and applications of solar pavement. 5 tabs, 14 figs, 25 refs.
Last Update: 2020-01-17