FLUIDEZ E PROPRIEDADES MECÂNICAS DE ARGAMASSAS PARA SISTEMAS DE PISO AUTONIVELANTES CONTENDO FÍLER DE BRITAGEM DE BASALTO
DOI:
https://doi.org/10.46421/entac.v18i.1023Keywords:
Self-leveling mortar, Crushed basaltic filler, Fluidity, Mechanical strengthAbstract
Self-leveling mortars used in flooring systems are characterized by high fluidity and, therefore, the use of fines is essential. The use of fillers generated as by-products of stone crushers in quarries, such as basaltic filler, can be an alternative source of fines in these mortars. This study aimed to investigate the influence of the sand content and the partial replacement of sand by crushed basalt filler. The filler was used in contents of 4.5%, 9% and 18% of the mass of total solid in self-leveling mortars. The properties evaluated were: fluidity and compressive strength at 1 and 28 days. The results obtained show that the sand content must be limited and the paste content sufficient to guarantee the mixture fluidity. In the fresh state, the increase in the crushed filler content increases the amount of superplasticizer for the same consistency. However, higher filler contents result in higher mechanical strength. Thus, it was found that the crushed basalt filler has the potential to be used in self-leveling mortars.
References
ABNT. NBR 13279: Argamassa para assentamento e revestimento de paredes e tetos -Determinação da resistência à tração na flexão e à compressão. Rio de Janeiro. 2005.
______. NBR 16372: Cimento Portland e outros materiais em pó – Determinação da finura pelo método de permeabilidade ao ar (método de Blaine). Rio de Janeiro. 2015.
______. NBR 16541: Argamassa para assentamento e revestimento de paredes e tetos -Preparo da mistura para a realização de ensaios. Rio de Janeiro. 2016.
______. NBR 16605: Cimento Portland e outros materiais em pó – Determinação da massa específica. Rio de Janeiro. 2017.
______. NBR NM 52: Agregado miúdo – Determinação da massa específica e massa específica aparente. Rio de Janeiro. 2009.
______. NBR NM 248: Agregados – Determinação da composição granulométrica. Rio de Janeiro. 2003.
BARLUENGA, G.; HERNÁNDEZ-OLIVARES, F. Self-levelling cement mortar containing grounded slate from quarrying waste. Construction and Building Materials, v. 24, n. 9, p. 1601-1607, 2010.
DOBISZEWSKA, M.; SCHINDLER, A. K.; PICHÓR, W. Mechanical properties and interfacial transition zone microstructure of concrete with waste basalt powder addition. Construction and Building Materials, v. 177, p. 222-229, 2018.
LAIBAO, L.; YUNSHENG, Z.; WENHUA, Z.; ZHIYONG, L.; LIHUA, Z. Investigating the influence of basalt as mineral admixture on hydration and microstructure formation mechanism of cement.
Construction and Building Materials, v. 48, p. 434 – 440, 2013.
ONISHI, K.; BIER, T. A. Investigation into relations among technological properties, hydration kinetics and early age hydration of self-leveling underlayments. Cement and Concrete Research, v. 40, n. 7, p. 1034-1040, 2010.
SEIFERT, S.; NEUBAUER, J.; GOETZ-NEUNHOEFFER, F. Spatially resolved quantitative in-situ phase analysis of a self-leveling compound. Cement and Concrete Research, v. 42, n. 7, p. 919-927, 2012.
UNČÍK, S.; KMECOVÁ, V. The effect of basalt powder on the properties of cement composites. Procedia Engineering, v. 65, p. 51-56, 2013.
UYSAL, M.; YILMAZ, K. Effect of mineral admixtures on properties of self-compacting concrete.
Cement and Concrete Composites, v. 33, n. 7, p. 771-776, 2011.
