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TINKER, J. A.; JOHN, V. M.; SATO, N. M. N. Improving the thermal performance of concrete using lightweight aggregates replacementes. In: CIB SYMPOSIUM ON CONSTRUCTION E ENVIRONMENT: THEORY INTO PRACTICE, 2000, São Paulo. Anais… São Paulo, 2000.
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Dados do autor na base InfoHab:
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Abstract

In the worldwide quest to reduce global pollution, most new building designs have to meet some form of energy performance criteria. Most buildings contain large quantities of concrete or concrete based materials and as aggregate occupies the greatest part of a concrete it has an influence on its thermal properties and hence on the thermal performance of the building. Whilst concrete’s made from natural aggregates yields high strength, they generally exhibit poor thermal performance and hence contribute to poor energy efficiency of the building. Energy efficiency of the concrete product can be improved by the use of lightweight aggregates and other replacement materials. Most lightweight aggregates are renowned for their porous, cellular structure and load-bearing qualities. However, little is known about their thermal performance. This paper examines the thermal conductivity of different concrete’s in the density range 1100-1400kg/m3 made from four different aggregate materials based on PFA, BFS, a sintered colliery shale/clay mixture and coconut fibers. Various specimens of each concrete were cast using different aggregate:cement ratios and their thermal conductivity was measured using an experimental technique based on a hot-plate using equilibrium air-dry concrete specimens. The results indicate that aggregate type and mix proportions significantly affect density and thermal conductivity while the cement content influences the equilibrium air-dry moisture content.
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