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Heat transfer dynamics analysis of composite recycled concrete wall with expanded polystyrene formwork

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Document pages: 7 pages

Abstract: Because recycled concrete has the advantages of reducing pollution, energy saving and resource recycling, and the apparent heat storage and insulation rate of expandable polystyrene (EPS) formwork, its combined heat transfer dynamics has become a contemporary research topic. In this paper, the heat transfer coefficient u of EPS formwork recycled concrete shear wall is studied. In order to quantify its heat output, four concrete mixture shear wall samples with different insulation types were developed. The effects of temperature (T) and humidity (H) on the thermal conductivity of reinforced concrete and EPS formwork are studied( λ) The impact of. λ 0°C(rlative variation for a 0°C of temperature variation in T) of cement mortar, recycled-concrete shear wall, and ordinary concrete shear wall were measured being 0.7526, 1.2463, and 1.3750 W·m−1·K−1, respectively. And the λ calculation of EPS was carried out being 0.0396 W·m−1·K−1. A corrected calculation method was put forward to application in practical work that could reflect the real U value in a more precise manner. These results brought to light the fact that the heat preservation output of recycled-concrete shear wall posed to be comparatively more improved than that of ordinary concrete shear wall. We put forth the suggestion for the use of corrected calculation method in the calculation and analysis of U of EPS template recycled-concrete composite shear wall in the climatic conditions of Beijing. The results revealed the fact that the U of EPS template recycled-concrete shear wall was dominantly controlled by the change of thermal conductivity changes of EPS template. The monthly mean U increased with increasing Tout and decreased with decreasing Tout. The smaller the U of the enclosure wall was, the better the thermal stability of the wall was experienced.

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