Study of urban heat island effect and MSWI and insulation materials reduce the surface temperature for cement mortar

• Main Authors: Yuan Sheng Hsien, 袁勝賢
• Other Authors: Hung Ming Jui
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/78014194858932077118

碩士 === 明志科技大學 === 生化工程研究所 === 98 === Excessive artificial surfacing more often caused one of the causes of increased urban heat island effect, mainly due to the general pavement materials often have high unit weight and low porosity and other characteristics, it is easy to absorb solar radiation of short wave infrared heat to form the phenomenon of high accumulation. This study of urban waste incinerator bottom ash as a recycled material, while attempting to add a low thermal conductivity of inorganic insulation material, hoping to improve the existing concrete pavement products category generally have a high thermal conductivity, in order to reduce the labor of the city pavement the ability of the heat island effect. In this study, mortar specimens were added bottom ash and the inorganic insulating material, in the laboratory the thermal properties of a series of tests, initial results show that: (1)The use of MSWI bottom ash in cement mortar specimens, the lower pavement surface temperature does not have effect. (2)The use of low thermal conductivity of inorganic insulation material in cement mortar specimens in order to reduce the pavement surface temperature is quite feasible, such as: mica powder, calcium carbonate, calcium silicate, talc and other four materials, with the addition of drop of pavement surface temperature is proportional to add to more than 40%, respectively, the surface temperature can drop about 1-3 ℃. However, the effectiveness of magnesium oxide is not obvious, and kaolin have the opposite effect has happened. (3)Part of the inorganic thermal insulation materials, thermal conductivity and surface temperature variation between the relationship is not consistent. Indication that the man-made open space pavement, the assessment of the thermal properties of surface materials, in addition to thermal conductivity, the need to be further consideration of the surface temperature of the reaction, or threatens to misjudge its effectiveness. (4)Shows the microstructure of the material, particle surface more smooth, flat and the higher the degree of white material, due to better reflection of solar radiation effects, which have lower surface temperatures; the contrary, the greater the degree of rough and white lower the material had a higher surface temperature.