Uso de agregados reciclados de concreto em blocos de alvenaria estrutural / Use of recycled concrete aggregates in blocks of structural masonry

AUTOR(ES)

Alexandre Marques Buttler

DATA DE PUBLICAÇÃO

2007

RESUMO

The main goal of the present research project was the evaluation of recycled concrete aggregates incorporation in structural concrete blocks of three different levels of compressive strength (4,5 MPa, 8,0 MPa and 12,0 MPa). The study was developed in four stages. The first stage analyzed the physical properties of fine and coarse concrete aggregates derived from a precast concrete plant. In the second stage, physical and mechanical properties of dry consistency concrete cylindrical specimens were analyzed using two types of recycled aggregates. The aim was to define a correlation interval between the compressive strength of cylindrical specimens and concrete blocks, verify the influence of recycled aggregates on the physical and mechanical properties, and determine the better compositions to be used in the next stage. The third stage involved the technical viability of producing concrete blocks, and also the economic viability of some recycling alternatives. As a whole, independently of the strength class, the recycled coarse aggregate blocks fulfilled the required specifications; additionally the economic hypotheses confirmed the viability of producing recycled aggregate units with both production and market costs lower than those of the conventional units. Finally, the fourth stage dealt with the drying shrinkage of mini-walls, the compressive strength and the elasticity modulus of elements (prisms and mini-walls) built with units defined in the former stage. Based on the obtained results, the study showed that only the drying shrinkage property was affected by the recycled aggregates units; the reduction of the distance between two adjacent control joints was an adequate procedure to minimize the effects of the drying shrinkage in this case.

ASSUNTO(S)

agregados reciclados de concreto recycled concrete aggregates propriedades físicas e mecânicas physical and mechanical properties structural blocks produced with recycled concrete aggregates blocos estruturais com agregados reciclados de concreto elements composed with recycled concrete aggregates elementos compostos por unidades com agregados reciclados

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