دانلود رایگان مقاله اندازه گیری دمای سطح جاده چندین آسفالت پیاده رو

Abstract

In the urban area, the heat island phenomenon and hot nights when the temperature does not fall below 25 °C outdoors are becoming environmental problems. Pavements cover a high percentage of the urban area and largely affect the development of the urban heat island phenomenon. The authors have developed water retaining pavements with several cement-based grouting materials poured into voids of open graded asphalt pavements (porous asphalt pavements) to reduce the surface temperature in the hot summer climate. The cement-based grouting materials consist of cement, ceramic waste powder, and fly ash or natural zeolite. In field measurements conducted in the summer season, all of the water retaining pavements reduced the surface temperature by 10 °C and more, when the porous asphalt pavement reached over 60 °C. Especially, one of the water retaining pavements, which uses ultra-rapid hardening cement, ceramic waste powder, and natural zeolite, reduced the surface temperature by about 20 °C. In this paper, the details of the cement-based grouting materials used in the field tests are described. Also, the field test results on the thermal performance of the water retaining pavements are reported.

4. Conclusions

Asphalt pavements cover a high percentage of the urban area and largely affect the development of the urban heat island phenomenon. This study has two purposes: to utilize the ceramic waste powder and to improve the thermal conditions in the urban environment. In this study, the cement-based grouting materials used for the water retaining pavements were developed and the surface temperature of those water retaining pavements was measured in the field tests. All of the cement-based grouting materials were confirmed to effectively reduce the surface temperature of the asphalt pavement. The combinations of cement-based grouting materials can be selected from a viewpoint of economical and thermal performance. Especially, the ultra-rapid hardening cement and the natural zeolite having creamy color as the cement-based grouting material for the water retaining pavement more effectively reduce the surface temperature of the asphalt pavement. Their application to the urban area can have great potential in reducing the surface temperature and contribute to the mitigation of the urban heat island phenomenon. Moreover, the ceramic waste powder is utilized.