Caracterização de argamassas produzidas com agregado miúdo reciclado de resíduos da fabricação de blocos de concreto

• Autor(a) principal: Romera, Bruno Ferreira
• Data de Publicação: 2019
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Biblioteca Digital de Monografias da UFMT
• Texto Completo: http://bdm.ufmt.br/handle/1/1059
• topic: CNPQ::ENGENHARIAS::ENGENHARIA CIVIL; Resíduos de construção civil; Agregado reciclado; Argamassa reciclada; Civil construction waste; Recycled aggregate; Recycled mortar

The construction industry, together with the consumption of building materials are constantly growing worldwide, making the sector one of the largest explorers of non-renewable natural resources. In addition to this reality, in Brazil, due to the construction processes adopted, civil construction is also the branch of activity that generates the most amount of solid waste, and these wastes are called Civil Construction Waste (CCW). In this context, many researches have been carried out in order to develop technologies aimed at recycling this material, since many of them are susceptible to this process. In addition, the reuse of civil construction waste as a raw material within the civil construction industry, such as aggregates, for example, results not only in the improper non-disposal of these wastes, but also in the non-exploitation of natural aggregates through of natural deposit and riverbeds, considering also the environmental impacts that this large-scale exploitation causes. Thus, the present study seeks to contribute to this field of research by bringing a characterization of recycled mortars produced through the use of civil construction waste obtained from the tailings of a concrete precast industry as an alternative of recycled aggregate. This characterization was done through standardized tests of determination of tensile strength in flexion, axial compression and water absorption by capillarity, aiming to propose a possible replacement of natural sand commonly used as a fine aggregate in certain applications in civil construction. For this, a study was carried out on the granulometric composition of the beneficiated residue, where a divergence could be observed in relation to the natural fine aggregate. Therefore, an adequacy was made in the granulometric composition of this material based on the granulometric composition of the natural sand obtained in the local trade, where all the dosages followed this reference. The flexural tensile strength test showed closeness between the results compared to the common mixed mortar in two of the three dosages of recycled mortar (1:2:6 and 1:2:9) used by the study and the axial compression resistance test presented equivalent of results for all traces of recycled mortar in the same comparison. In the capillary water absorption test, three of the four traces of recycled mortar (1:2:6, 1:2:8 and 1:2:9) used had satisfactory results, with only slight variations in the comparison with the common mortar. Thus, the recycled mortar proposed by the study showed better results in the proportions 1: 2: 6 and 1: 2: 9 in the substitution of common mixed mortar in applications that have as requisite properties like mechanical resistance and water absorption, considering that these characteristics were equivalent in the comparison between the mortars. It should be noted that other properties should be raised in later studies to better characterize this type of recycled mortar.