Stress-strain curve of concretes with recycled concrete aggregates: analysis of the NBR 8522 methodology
ABSTRACT This work analyses the methodology "A" (item A.4) employed by the Brazilian Standard ABNT 8522 (ABNT, 2008) for determining the stress-strain behavior of cylindrical specimens of concrete, presenting considerations about possible enhancements aiming it use for concretes with recyc...
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doaj-34cf73ac1273404d934892be5f06e00b2020-11-24T23:22:34ZengInstituto Brasileiro do Concreto (IBRACON)Revista IBRACON de Estruturas e Materiais1983-419510354756710.1590/s1983-41952017000300002S1983-41952017000300547Stress-strain curve of concretes with recycled concrete aggregates: analysis of the NBR 8522 methodologyD. A. GUJELC. S. KAZMIERCZAKJ. R. MASUEROABSTRACT This work analyses the methodology "A" (item A.4) employed by the Brazilian Standard ABNT 8522 (ABNT, 2008) for determining the stress-strain behavior of cylindrical specimens of concrete, presenting considerations about possible enhancements aiming it use for concretes with recycled aggregates with automatic test equipment. The methodology specified by the Brazilian Standard presents methodological issues that brings distortions in obtaining the stress-strain curve, as the use of a very limited number of sampling points and by inducing micro cracks and fluency in the elastic behavior of the material due to the use of steady stress levels in the test. The use of a base stress of 0.5 MPa is too low for modern high load test machines designed do high strength concrete test. The work presents a discussion over these subjects, and a proposal of a modified test procedure to avoid such situations.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952017000300547&lng=en&tlng=en8522 Standard (ABNT, 2008)ConcreteModulus of elasticitystrength-stress behaviour |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
D. A. GUJEL C. S. KAZMIERCZAK J. R. MASUERO |
spellingShingle |
D. A. GUJEL C. S. KAZMIERCZAK J. R. MASUERO Stress-strain curve of concretes with recycled concrete aggregates: analysis of the NBR 8522 methodology Revista IBRACON de Estruturas e Materiais 8522 Standard (ABNT, 2008) Concrete Modulus of elasticity strength-stress behaviour |
author_facet |
D. A. GUJEL C. S. KAZMIERCZAK J. R. MASUERO |
author_sort |
D. A. GUJEL |
title |
Stress-strain curve of concretes with recycled concrete aggregates: analysis of the NBR 8522 methodology |
title_short |
Stress-strain curve of concretes with recycled concrete aggregates: analysis of the NBR 8522 methodology |
title_full |
Stress-strain curve of concretes with recycled concrete aggregates: analysis of the NBR 8522 methodology |
title_fullStr |
Stress-strain curve of concretes with recycled concrete aggregates: analysis of the NBR 8522 methodology |
title_full_unstemmed |
Stress-strain curve of concretes with recycled concrete aggregates: analysis of the NBR 8522 methodology |
title_sort |
stress-strain curve of concretes with recycled concrete aggregates: analysis of the nbr 8522 methodology |
publisher |
Instituto Brasileiro do Concreto (IBRACON) |
series |
Revista IBRACON de Estruturas e Materiais |
issn |
1983-4195 |
description |
ABSTRACT This work analyses the methodology "A" (item A.4) employed by the Brazilian Standard ABNT 8522 (ABNT, 2008) for determining the stress-strain behavior of cylindrical specimens of concrete, presenting considerations about possible enhancements aiming it use for concretes with recycled aggregates with automatic test equipment. The methodology specified by the Brazilian Standard presents methodological issues that brings distortions in obtaining the stress-strain curve, as the use of a very limited number of sampling points and by inducing micro cracks and fluency in the elastic behavior of the material due to the use of steady stress levels in the test. The use of a base stress of 0.5 MPa is too low for modern high load test machines designed do high strength concrete test. The work presents a discussion over these subjects, and a proposal of a modified test procedure to avoid such situations. |
topic |
8522 Standard (ABNT, 2008) Concrete Modulus of elasticity strength-stress behaviour |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952017000300547&lng=en&tlng=en |
work_keys_str_mv |
AT dagujel stressstraincurveofconcreteswithrecycledconcreteaggregatesanalysisofthenbr8522methodology AT cskazmierczak stressstraincurveofconcreteswithrecycledconcreteaggregatesanalysisofthenbr8522methodology AT jrmasuero stressstraincurveofconcreteswithrecycledconcreteaggregatesanalysisofthenbr8522methodology |
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