Granulometria dos agregados graúdos comercializados nos municípios da Chapada do Apodi/RN – análise comparativa com a norma NBR 7211/2009

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2019-03-18
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Universidade Federal Rural do Semi-Árido

Resumo

The microregion of Chapada do Apodi, in the State of Rio Grande do Norte, is evidenced by the great talent in mineral resources for the civil construction industry. This work aims to compare the granulometry of large aggregates: crushed stone and gravel marketed, with the Brazilian National Standards Organization (BNSO) in the Chapada do Apodi-RN. Samples of crushed stone and gravel types were collected according to the availability of the trades of the four cities studied: Caraúbas, Apodi, Felipe Guerra and Governor Dix-Sept Rosado. The experimental analyses were carried out in the soil laboratory at the Federal Rural Semiarid University - UFERSA, Caraúbas Campus. The granulometric analyzes of crushed stone and gravel types were carried out on standard Tyler or American series screens. The absorption test consisted of submersing 3000g of limestone and granite grit classified commercially by crushed stone 19mm, and 2000g of limestone and granite gravel classified according to gravel trade; in water at room temperature for a period of (24 ± 4) h. Apodi, Felipe Guerra and Governor Dix-Sept Rosado were found in the Chapada do Apodi, in the municipalities of Caraúbas, Apodi, Felipe Guerra and the Governor Dix-Sept Rosado, which are available in the trade are 19mm gravel and gravel. The majority of available Britons are of granite origin purchased at the quarry in the municipality of Caraúbas; in the cities of Governador Dix-Sept Rosado and Felipe Guerra, gravel and gravel of calcareous origin were also found. In Governador Dix-Sept Rosado was found the gravel offered by 19mm and in Felipe Guerra, like gravel, both of calcareous origin. In Caraúbas, other sizes of crushed stone and gravel of granite origin are available in sizes of 25mm and 19mm and gravels by 9mm and 12mm, respectively; all these commercially available sizes do not match the granulometric grading according to ABNT NBR 7211 standards. The water absorption test according to NBR NM 53/2003 was satisfactory for granitic samples, but not for calcareous samples according to limits imposed by the standard. It was also observed that brittle granitic rocks are consistently brittle and with less water absorption, thus being the most qualified in construction for the traces, since limestone found in Felipe Guerra and Governador Dix-Sept Rosado, absorb more water, influencing the water/cement factor of the traces, facilitating the pathological manifestations and problems in the quality of the concrete. Granite gravel has a better performance than limestone.


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Nogueira (2019) (NOGUEIRA, 2019)