This study characterized discarded sanitary ware waste (SWW) that could not meet quality requirements. To understand the composition of such SWW, samples were collected, processed, and characterized. This SWW was used to substitute granite in ceramic slips, and the final recycled sanitary ware compositions of 5%, 10%, 25%, 50% and 100% were obtained. Then, the mixtures were evaluated based on density, rheology, linear shrinkage, water absorption, and flexural strength. The results for viscosity and pyroplastic deformation in specimens containing the ceramic waste were better than the reference slip used in a production line. Results for density, water absorption and linear shrinkage showed no significant difference from the control samples. Although the replacement of more than 5% of granite reduced the flexural strength, no tested specimen was below the minimum value required by the industry.

The Alto Paranaiba and Triângulo Mineiro mesoregion in the state of Minas Gerais and the State of São Paulo have a number of industries with eucalyptus chip fired boilers that produce great amounts of ash. Since thermoelectric ashes generally have good pozzolanic activity, this paper studied the mechanical behavior of cementitious composites made with raw eucalyptus chip ash as a partial replacement for Portland cement and processed under two different conditions. The mechanical behavior of the composites was measured from tests on specimens for their compressive strength, tensile strength to diametral stress and to bending. Results show ashes could be used as mineral additives.

ResumoO grande volume de resíduos sólidos industriais gerados pela indústria de batatas pré-fritas e o alto custo do seu manejo estimulam pesquisas em busca de soluções mais adequadas para a sua destinação final. Esse trabalho caracterizou o resíduo sólido (lodo) de Estação de Tratamento de Efluentes (ETE) de indústria de batatas. O lodo foi processado através de secagem, desidratação, moagem e peneiramento. Para a caracterização do lodo foram utilizadas técnicas de granulometria a laser, microscopia eletrônica de varredura (MEV) com espectrômetro de raios X dispersivo em energia (EDS), difração de raio X, análise térmica diferencial (DTA), termogravimétrica (TGA) e perda ao fogo. Após a caracterização, o lodo foi utilizado para a confecção de compósitos cimentícios, em substituição parcial do cimento, em massa equivalente para substituição do mesmo volume, determinado pelas massas específicas de ambos materiais, nas porcentagens de 3, 5, 7 e 10%. Os compósitos foram ensaiados para a obtenção da resistência à compressão e do módulo de elasticidade dinâmico. A utilização do lodo de ETE como pozolana foi descartada, tendo-se como base o resultado do ensaio de perda ao fogo. Nos ensaios mecânicos realizados, nota-se que a adição de lodo, em substituição parcial ao cimento, impactou, negativamente, de forma mais relevante a resistência à compressão. Tais ensaios foram considerados satisfatórios para os compósitos com substituição do cimento por 3% e 5% de lodo. Palavras-chave: Lodo de ETE, indústria de batatas pré-fritas. AbstractThe

The manufacture of Portland cement used in the production of concrete emits large amounts of CO2into the atmosphere, contributing to the increase of the greenhouse effect. The environmental impact generated by the mineral exploration activity is a problem of easy verification, especially in open pit mines. The present work evaluated the possibility of using iron ore tailing as an addition to the partial replacement of the cement in mortars. The iron ore tailings were processed by drying in oven (48h at 105oC) and milling in a planetary mill (10min at 300RPM), obtaining medium grain size of 14,13 μm. For the characterization, laser granulometry, X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential thermal and thermogravimetric analysis (DTA / TGA) were performed. The sample is composed predominantly by quartz, hematite, goethite and gibbsite. After the characterization, the waste was used in the preparation of test specimens, with 10, 20 and 30% weight substitution of the cement. The composites were submitted to compression tests, with ages of 3, 7 and 28 days, using a strength rate of 0,25MPa/s. The mortars with 10, 20 and 30% of substitution presented resistance of 41.65, 36.26 and 31.64 MPa, being able to be characterized as category of Portland cement of resistance 40, 32 and 25 respectively. Considering the reduction of cement in the mortars produced, the results of compressive strength were relevant for the substitutions. The cements produced with the substitutions according to the Brazilian standards under the mechanical aspect can be classified as Portland cement.

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