INFLUÊNCIA DO TAMANHO DO CORPO DE PROVA NOS RESULTADOS DE ENSAIOS DE MÓDULO DE DEFORMAÇÃO E RESISTÊNCIA À COMPRESSÃO E SUAS CORRELAÇÕES PARA CONCRETOS PRODUZIDOS EM GOIÂNIA - GO
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2008-10-03
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Universidade Federal de Goiás
Resumo
Even though the different sizes of cylindrical specimens for tests in concrete are
standardized to get the simple compressive strength and the modulus of elasticity,
this factor is not usually studied in most researches. So, the goal of this thesis was to
evaluate the influence of the size of the specimens in the initial tangent modulus of
elasticity (Eci) and in the compressive strength (fc), correlate the values of fc and Eci,
and compare the values of modulus of elasticity that were estimated by the equations
proposed by the Brazilian code (NBR 6118/2003) and by the American norm (ACI
318/2002).
Concretes with three levels of strength were used after 28 days: 25MPa, 30MPa and
40MPa. They were all proportionally mixed with materials of the region and supplied
by only one concrete batching plant of Goiânia GO. The tests of compressive
strength and initial tangent modulus of elasticity were done in cylindrical specimens
of 100 x 200 mm and 150 x 300 mm after 28 days. The samples were collected
during the delivery of the concrete in the construction sites. For each truck, ten
specimens were molded, five of 100 x 200 mm and five of 150 x 300 mm. Of the 600
specimens that were molded, 240 tests of compressive strength and 360 tests of
modulus of elasticity were done. The cure was in a tank with water saturated with
limestone. After the tests were done, the statistical analysis of the results was done.
The variance analysis (ANOVA) indicated that the size of the specimen exerts
influence only on the results of the initial tangent modulus of elasticity (Eci). There is
a tendency for the specimens of 100 x 200 mm to show greater results for the
modulus of elasticity of the concrete than the specimens of 150 x 300 mm. In the
compressive strength, only the level of strength significantly exerted influence on the
results. It was also observed that the NBR 6118/2003 overestimates the values of
modulus of elasticity of the researched concretes and the results are better adequate
to the model proposed by the ACI 318/02.
Descrição
Palavras-chave
concreto, tamanho do corpo de prova, módulo de deformação
tangente inicial, resistência à compressão, centrais de concreto, análise estatística,
NBR 6118/2003. , concrete, size of the specimen, modulus of elasticity, compressive
strength, concrete batching plants, statistical analysis, NBR 6118/2003.
Citação
MARTINS, Danilo Gomes. INLUENCE OF THE SIZE OF THE SPECIMEN IN THE RESULTS OF THE TESTS
OF MODULUS OF ELASTICITY AND COMPRESSIVE STRENGTH AND THEIR
CORRELATIONS FOR CONCRETE MADE IN GOIÂNIA GO. 2008. 113 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2008.