Cinza da casca do arroz utilizada em argamassas de assentamento e revestimento.

Abstract

The use of residues as alternative materials have been shown satisfactory according to some studies. The husk rice ash (HRA) is a vegetal residue that causes ambient impact, but it has a great potential for use in civil engineering construction in the production of mortars and concrete, mainly because of its high content of silica (SiO2) and so it can be used as pozzolan. This research aimed to verify the viability of husk rice ash added to mortars for bricklaying and covering. Conventional and alternative raw materials used to produce mortars were characterized by the physical, chemical and mineralogical properties as well as to evaluate HRA as pozzolanic property. The development of the study firstly determinate the consistence of each mix studied after reference mortars and mortars with HRA mixes of 1:2:9 and 1:1:6 incorporated with 6%, 9%, 15%, 20% and 30% of HRA in partial substitution of cement for curing period of 28, 63 and 91 days. The results to characterize raw materials are in standard values established by Brazilian Standards (ABNT) and to HRA was used its pozzolanicity through high surface area, pozzolanic activity and its mineralogical properties which shown to be predominantly amorphous. To the technological testings, the mortars mixes of 1:2:9 e 1:1:6 showed satisfactory results in relation to the physical and mechanical performance, where the mortars with HRA incorporated had values superior to the reference mortars, probably due to pozzolanic reactions. With these results, it can be concluded that the utilization of HRA in mortars is feasible in relation to the technical and ecological aspects.