Artigos científicos, teses e dissertações
Publicados nas melhores instituições de ensino

Cementing operation is one of the most important stages in the oil well drilling processes and has main function to form hydraulic seal between the various permeable zones traversed by the well. However, several problems may occur with the cement sheath, either during primary cem...

In the state of Acre, Brazil, traditional fine and coarse grain aggregates are used. By the way, the concrete materials proportioning (of that region, as well as of all regions) aim to reach the better quality (strength, durability) instead of costs. This paper offers data for a ...

The use of red ceramics bricks finely grinded as pozzolanic addition to cements, mortar and concrete reveals a viable alternative, with technical, economic and environmental advantages, joining wasted material by the industry, which not always has a proper destination, to the inp...

This study evaluated the feasibility of using sugar cane bagasse ash (SCBA), a by-product of the sugar cane ethanol industry, obtained under controlled calcination as a partial replacement for Portland cement in mortars. Materials with pozzolanic characteristics may be used to pa...

Mineral and organic additions are often used in mortars to improve their properties. Microstructural investigation concerning the effects of styrene acrylic polymer and silica fume on the mineralogical composition of high-early-strength portland cement pastes after 28 days of hyd...

Elephant grass ash (EGA) was produced at 700 °C, with two different treatments: hot water (EGAhw) or acid solution (EGAas). The efficiency of the treatments at removing the potassium oxide was evaluated with the aim of using the EGA as a pozzolanic mineral addition for cement-bas...

The importance of civil construction for humanity is unquestionable. Today, environmental concerns and more stringent legal requirements have fueled research on the possible uses of agricultural and industrial byproducts in concrete as a way of creating more sustainable construct...

The importance of civil construction for humanity is unquestionable. Today, environmental concerns and more stringent legal requirements have fueled research on the possible uses of agricultural and industrial byproducts in concrete as a way of creating more sustainable construct...

The work presents the characterization of clays from sterile mining of the concentrated phosphatic materials of Araxá in Minas Gerais as pozzolanic materials. Three clays of distinct tones, namely, yellow (YC), red (RC), and intermediate (IC) clays, were used at different levels ...

Abstract This study explores the potential of the granite residue to be applied as a supplementary cementitious material. Furthermore, the efficiency of grinding methods in the improvement of the residue reactivity was also evaluated. The granite residue was collected in a facili...

Resumo Materiais cimentícios alternativos podem reduzir potencialmente o impacto ambiental da extração de cal e a produção de cimento Portland. Resíduos de cerâmica vermelha podem ser triturados em partículas finas e usados como fíler ou adição pozolânica em argamassas de cimento...

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Red mud, the main waste generated in aluminum and alumina production by the Bayer process, is considered hazardous due to its high pH, according to the Brazilian standard NBR 10004/2004, and worldwide generation of this waste exceeds 117 million tons/year. In this work, non-calci...

Portland cement based materials have great potential for providing good waste immobilization solutions, which are both cost effective and also promotes the sustainable development of modern industrial activities. Indeed, several industrial wastes have successfully been used in co...

The properties of peanut husk ashes as a potential supplementary material in cement mortars were studied in the laboratory. The ashes were prepared in an electric furnace at 500, 650 and 800 ºC during 180 minutes and used without further treatment. The characterization of ashes i...

Resumo Neste trabalho avaliou-se o potencial reativo de adições de resíduo de cerâmica vermelha (RCV) e de concreto de RCD, além de fíler calcário para referência. Avaliou-se o potencial pozolânico das adições por índice de atividade pozolânica (IAP) com cal, índice de desempenho...

Abstract The use of supplementary cementitious materials (SMCs) is one of the three essential factors for the sustainability of the cement industry. To reduce CO2 emissions, several studies have introduced new methods for the utilization of industrial wastes such as the addition ...

This paper presents an evaluation study of wastes from pulp and paper as well as construction and demolition industries for application in cement-based materials. The alternative raw materials were used as a source of calcium carbonate (CaCO3) and as pozzolanic material (water-re...

Composites reinforced with natural fibers are a good asbestos fibercomposites replacement material, as a result of the great natural fiber avaibility such as coco nut, sisal and cellulose. Durability aspects need to be improved, like the decrease of fiber resistance in alkaline e...

This paper presents a study on the production of silica gel in hydrothermal process using residual rice husk ash. Measurements of the chemical composition, X-ray diffraction, infrared spectroscopy, particle size distribution, and pozzolanic activity were carried out in order to c...