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Essay Preview: Mr Report this essay Ajdukiewicz, A., Kliszczewicz, A., 2002. Influence of recycled aggregates on mechanical characteristics of HS/HPC. Cement and Concrete Composites 24 (2), 269-279. Bulgaria-Country Profile, 2001. Information Provided by the Government of Bulgaria to the United Nations Commission on Sustainable Development, Ninth Session, 18 April-1 May, New York. Buyle-Bodin, F., 1993..