Avaliação da viabilidade técnica do uso de água residuária como água de amassamento

• Autor(a) principal: Silva, Wyoskynaria Mihaly Maia da
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/40893
• topic: Reúso; Água residuária; Água de amassamento; Concreto

Water shortage is a problem that affects mainly the Northeastern region of Brazil due to factors such as irregularity on the rainfall regime, low rainfall index and high temperatures throughout all year, becoming a limiting factor for the region development. In this scenery, water reuse presents itself as a viable alternative to preserve this limited natural resource, a necessity and an important instrument of water resource management, as it can be implemented in many fields, such as agricultural, industrial and urban fields. One of the areas where the wastewater reuse is feasible is the civil construction, including for activities such as production and cure of concrete. Considering the high production and elevated water consumption of the concrete industry, there is a favourable scenario to investigate the viability of the use of alternative water sources in the field. On this mindset, the present research aims to evaluate the technical viability of the use of wastewater as mixing water. Therefore, it was performed an study based on the NBR 15.900 – Mixing water for concrete using distilled water, potable water and wastewater from a secondary treatment plant. Chemical analysis were performed for the potable water and the waste water, where the potable water showed total compliance to the established limits and the wastewater did not met the requirements for detergents, colour and odour. The setting time for potable water and wastewater met the requirements of the NBR 15.900, as the difference from the distilled water was less than 25%. Compression resistance for mortars also met the requirements, as it were superior to 90% of the resistance to the reference mortar, made with distilled water. In addition to the compliance verification of the NBR 15.900 parameters, three concretes were executed using the same proportions, substituting only the mixing water. For the workability, the concrete made with wastewater showed the lowest slump, below the desired value, but the concretes made with distilled and potable water showed adequate workability. The compression resistance of the concretes made with potable and wastewater were superior to 90% of the resistance of the concrete with distilled water, thereby meeting the norm requirements. Hence, it is concluded that the potable water is adequate as mixing water, while the wastewater should not be used for that intent, according to NBR 15.900, for it did not show compliance to the detergents, colour and odour parameters.