Avaliação de desempenho de argamassas modificadas com agregados finos de vidro

Abstract

The growth of civil construction have a big importance for the development of society, but in contrast, the sector consumes a large amount of available natural resources, generating a grand environmental impact. Scarcity of resources has led to the search for sustainable alternatives, worrying about the environment. in this context, waste recycling has proven to be a good alternative for reducing impacts generated by the construction sector. For some years now, many researchers have been thinking about the need to look for other alternative resources and / or materials - that can be used and perform well - to minimize the environmental impacts generated by construction waste. With a focus on material utilization, recycled materials such as glass waste appear to be a good option. Although glasss isn't a polluting material, it is not a biodegradable material because it does not decompose. However, it is an infinitely recyclable material. Turning it into an alternative source of raw material is the challenge of this work. Thus, the experimental program was developed in order to evaluate the technical viability of mortars produced using glass waste. The comminuted glass was used for the production of mortars, and entered the composition of the mixture in partial substitutions (by mass) of the natural fine aggregate, in the contents of 5%, 10%, 15% and 20%. The consistency was set at 250 ± 10 mm and for this parameter to be reached in the different mixtures the water content of the traces was modified. In the fresh state the properties of consistency index, mass density, incorporated air content and water retention were analyzed. In the hardened state the investigated properties were flexural traction, axial compression, capillarity water absorption, bulk density and dynamic modulus of elasticity. The evaluation of properties in the hardened state was also verified under the mortar applied on a standard substrate, where the tensile strength and water absorption tests were performed by the pipe method. The results indicated an improvement in the water retention of mortars, as well as a decrease in water absorption in the plates. Moreover, it was found that the mortars with glass powder maintained the properties of flexural tensile strength and tensile bond strength, and it is recommended to replace the maximum substitution content studied in the work.