Potencial de aproveitamento de resíduos de caulim paraibano para o desenvolvimento de argamassas de múltuplo uso. / Potential use of waste kaolin Paraiba for the development of multiple-use mortars.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

In Paraíba, the industry of the kaolin, an activity of great importance to the State and local producers, generating large amounts of waste that is landfilled, impacting the environment. The National Council on the Environment (CONAMA) has been made responsible for waste management to their generators. This residue does not have recycling technology known developed and field of study at the Federal University of Paraíba. Thus, this study aims to evaluate some aspects of waste aggregate and kaolin as filler in mortars and multiple use as pozzolanic material. Physical and mineralogical characterizations of waste were carried out by XRD qualitative and quantitative analysis miscrocópico optical unit mass and size distribution. Several mixtures of mortars were studied, in which combined the waste with cement and / or lime. In order to verify the capability of the residual clay as pozzolanic material, there was an improvement of the waste by grinding and calcination (at 700 C) and found the rate of pozzolanic activity and fineness (Blaine method). In the natural state the residual clay was tested as a plasticiser in multiple-use mortars and sand as aggregate. The performance of mortars were evaluated using the consistency and retention of water, fresh, compressive strength, bond strength traction, mass density, physical characteristics (absorption by immersion, density and voids) and capillary permeability in the hardened condition, being compared with a reference mortar and other industrialized by the market place. Was also made an assessment of waste heat in mortars, which were calcined up to 700 C, and after this calcination, we evaluated the curve tensãodeformação and stiffness of these mortars. The residues of kaolin in the composition contains quartz, mica and kaolinite, and can be classified as sand (locally called behaviors) and clay (locally called lees), according with the content of kaolinite. The clay showed about 55% of kaolinite and sand about 30%, and 58.5% quartz. The law of Abrams was followed for all mortars, with and without waste. The reduction of resistance in mortars with the waste is made more meaningful. Changes in mineralogy and form of particles of waste affected the packaging of them. The behavior of the stress-strain curve and modulus of elasticity for the variation temperature, the mortar with waste were significantly more stable, but lower values. In general, the waste of kaolin paraibanos studied in this work, has the potential to be used as constituent materials for mortar mutiple use, for the mechanical properties evaluated. The application of this waste depends on the content of kaolinite in your existing compoisção.

ASSUNTO(S)

argamassas. resíduos industriais engenharias caulim industrial waste kaolin mortars

ACESSO AO ARTIGO

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