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Acoustically Efficient Concretes Through Engineered Pore Structure

This paper describes the results of a research study aimed at developing and characterizing concretes with specially engineered pore structure as materials for sound absorption. In general, sound absorbing material are porous materials with reduced densities. The basic principle is that the acoustic energy is converted into heat energy in the open pores of the material, resulting in the reduction of perceived noise levels. The study demonstrated that by engineering the pore structure by careful aggregate grading as in enhanced porosity concrete, cementitious materials that have the potential for significant acoustic absorption could be developed.