Avaliação da substituição parcial do agregado miúdo por agregado reciclável de concreto em paver

Abstract

Considering the replacement of fine aggregate with recycled concrete aggregate as a means for recycling construction waste to reduce environmental impacts, this study evaluated the partial replacement of fine aggregate with recycled concrete aggregate in interlocking pavement, both in the fresh and hardened states. Preliminary procedures were carried out to obtain the characteristics of the materials. The blocks were made from a mix ratio of cement:sand:gravel/cement of 1:1.5:1.5:0.5 and 1% water-reducing admixture, with the partial replacement of fine aggregate with construction waste in fractions ranging from 5% to 20%. During the preparation of the specimens, tests were conducted in the fresh state and subsequently in the hardened state. It was found that only the concrete block made with a 15% replacement of fine aggregate with construction waste achieved the minimum strength specified by NBR 9781 (ABNT, 2013). Additionally, it was the only block to exhibit a void ratio lower than the reference composition. Regarding absorption, all results were satisfactory. In other aspects, we can conclude that the 15% replacement of sand with recycled aggregate is a viable alternative considering the current standard.