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Approaches in terms of concrete technology for the extension of the performance characteristics of c


Self-cooling concrete paving stones

 


The increasing development and expansion of urban areas is leading to inner-city heat islands due to the creation of thermal storage masses. This phenomenon is widely known as the ‘Urban Heat Island effect’, or UHI for short. The use of self-cooling concrete paving stones could counteract this phe-nomenon. Such stones should store water, wherein this water should evaporate again when tem-peratures increase. The utilisation of the evaporation enthalpy results in a lowering of the surface temperature. If these paving stones are used over extensive areas, a reduction of the ambient tem-perature is possible compared to normal paving systems. The optimisation of the grading curves of suitable concretes should result in a good compromise between the necessary mechanical charac-teristics and good water or water vapour transport characteristics. Mixtures with equal portions of fine and coarse grains proved to be particularly suitable. The use of paper ash, a residue from the paper industry, represents one approach to the realisation of the storage of water in concrete paving stones.

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CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 10 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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