This paper presents a method to deice concrete pavement with carbon nanotube (CNT) so as to avoid the adverse effects of conventional deicing method such as salt on the structure, function and environment. To meet the research objective, laboratory tests were incorporated with finite element method. Laboratory tests conducted with CNT embedded inside the slab to investigate how far the heat transfers on the surface temperature of above 0oC when CNT generates the target temperature of 60oC in the freezer temperature of -10oC. Also, the cases of three different spacing of 15, 20 and 30 cm between CNTs were conducted to determine the maximum allowable spacing of CNT. Along with these experimental tests, heat transferring analysis conducted to validate the test results.

PURPOSES : The purpose of this study is to develop a deicing pavement system using carbon fiber or graphite with high electrical conductivity and thermal conductivity. METHODS: Based on literature reviews, in general, conventional concrete does not exhibit electrical and thermal conductivity. In order to achieve a new physical property, experiments were conducted by adding graphite and carbon fiber to a mortar specimen. RESULTS: The result of the laboratory experiment indicates that the addition of graphite can significantly reduce the compressive strength and improve the thermal conductivity of concrete. In the case of carbon fiber, however, the compressive strength of the concrete is slightly increased, whereas, the thermal conductivity is slightly decreased against the plain mortar irrespective of the length of the carbon fiber. In addition, a mixture of the graphite and carbon fiber can greatly improve the degree of heating test. CONCLUSIONS : Various properties of cement mortar change with the use of carbon fiber or graphite. To enhance the conductivity of concrete for deicing during winter, both carbon fiber and graphite are required to be used simultaneously.

Domestic expressway are exposed to damage of combined deterioration by excessive use of deicer and a lot of cost is required for maintaining damage structures. Therefore now is the time that durability of subsidiary concrete structures is required to enhanced in order to reduce maintenance cost of structures and to promote road safety. In this study measured scaling resistance of concrete using the 4% CaCl2 used in the ASTM C 672 and 3% NaCl used in the MTO LS-412.