Development of Bottom Ash Block for Control Surface Temperature of Pavement and Non-Point Source Pollution
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1170-R05-26
Development of Bottom Ash Block for Control Surface Temperature of Pavement and NonPoint Source Pollution Jong-Bin Park1, SangHo Lee1, Ree-Ho Kim1and Hee-Bum Pyun1 1
Construction Environment Research Division, Korea Institute of Construction Technology,
Goyang, Gyeonggi-Do, 411-721 South Korea.
ABSTRACT Permeable pavement systems to alleviate urban heat island phenomena are suitable for a variety of residential, commercial and industrial applications, yet are confined to light duty and infrequent usage. And Most of study for the permeable pavement is limited to asphalt pavement. Also, immense quantities of coal combustion by-products are produced every year, but only a small fraction of them are currently utilized, particularly bottom ash which is used in this study. In this study, we aimed at the development of new permeable and water absorbing pavement blocks. Optimum conditions for compressive strength and water absorption, volume of water retention and porosity characteristics were investigated for production of the pavement blocks from bottom ash. In addition, removal efficiencies of pollutants in road runoff by the pavement blocks were compared under various conditions. Experimental results showed that the compressive strengths and water absorption after 7 and 28days for blocks were 12~15MPa and 18%, respectively. Also, turbidity and heavy metals in rainwater were successfully removed. So, further study on the durability test such as the effect of surface fouling by dust is possibly needed prior to use the new bricks as construction materials. Keyword : Heat island, Pavement, Temperature, Non-point source pollution, Block
INTRODUCTION In the large cities of industrial countries, most of the ground surface is covered by artificial pavement materials. Pavement materials heavily influence outdoor thermal environments. These factors have resulted in changing their microclimate, one of the contributory factors leading to global warming and heat island problems. Cities heated by sunlight retain their high temperature up to midnight, especially in the summer. The number of nights on which the minimum temperature is greater than 25oC (called tropical night) is increasing. So, to solve these problems, many studies have discussed. A few studies to analyze the characteristics of heat and water transfer processes in porous block pavement, asphalt and grass revealed that the surface temperature of permeable pavement is appreciably lower than that of impermeable pavement[1,2]. Many materials with water-retention properties have been developed for use in various types of functional pavement systems. In these pavements, a particular cooling effect arises from vapor evaporation occurs from the surface of pavements containing water-retention materials. But because it is difficult to maintain this effect for any length of time without supplying water, application of permeable or water retention pavements in the field were slight[3]. Also, Global freshwater resources are being increasingly polluted and depleted,
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