Influência da adição de resíduos industriais na durabilidade de blocos solo-cal.

Abstract

The industries of beneficiation of ornamental rocks, red ceramic and kaolin, generate large volume of waste, which are mostly discharged into the environment irregularly, thus causing serious environmental impacts. The reintegration of industrial waste in the productive chain, as raw material in the development for building materials, are being an alternative evaluated by several researchers. Among the alternative materials, soil-lime blocks has advantages such as simplicity of production, compression resistance similar to conventional blocks, are not submitted to the cooking process and enable the incorporation of waste with potential binder to matrix. Research results indicate that these residues when finely ground may submit caking properties that enable its incorporation in partial substitution of lime in soillime blocks manufacture. But to ensure reliability to alternative materials is essential evaluating their durability. This research aimed to evaluate the durability of soil-lime blocks incorporated with industrial waste arising from the processing of ornamental rocks, manufacturing of red ceramic and kaolin. Specimens were made at the dash 1:10 in ratio of lime: soil, and using waste to partially replace lime in the proportions 15%, 30% and 50% for curing periods of 28, 60 and 90 days. The materials were subjected to physical and mineralogical characterization tests, such as: granulometry by sieving and laser diffraction, chemical analysis, thermo differential analysis, thermo gravimetric analysis, and X-ray diffraction. The study of the durability was performed using the natural aging, accelerated aging by the technique of wetting and drying, driving rain simulation and resistance to attack sulfates , taking as parameter degradation the unconfined compressive strength of the blocks. The results showed that the incorporation of 15% ceramic waste and kaolin in soil -lime block does not compromise its durability.