Durabilidade de concretos com agregados reciclados: uma aplica？？o de análise hierárquica

the concern about the disposal of waste from the demolition of buildings and the scarcity of natural materials for the production of aggregates have motivated the realization of studies on the reuse of construction waste in different countries. this paper discusses the combined use of recycled aggregates from construction and demolition waste and natural aggregates in order to obtain suitable concrete strengths, emphasizing the durability of the structural elements produced. the main contribution of this paper is the use of hierarchical analysis to compare the performance of the options considered. this technique is based on identifying the key elements for decision-making in setting priorities and on the logical consistency of the model to be built. thirteen concrete mix proportions were included in the study (one reference plus twelve different levels of recycled aggregate) for each of the three levels of compressive strength considered (20, 30 and 40 mpa), totaling 39 mix proportions. these variations were evaluated using eight parameters and applying ahp for the purpose of providing a comprehensive assessment of the cases studied. the analytical hierarchy tool was effective in supporting decision-making in the process of designing concrete mix with recycled aggregates.