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      Experimental investigation on the use of steel-concrete bond tests for estimating axial compressive strength of concrete. Part 2: APULOT Translated title: Investigação experimental sobre o uso de ensaios de aderência aço-concreto para estimativa da resistência à compressão axial do concreto. Parte 2: APULOT


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          The scope of this research investigates the feasibility to use steel-concrete bond tests for estimating the compressive strength of concrete to supplementary use it in the quality control of reinforced concrete. Lorrain and Barbosa (2008)[1] and Lorrain et al. (2011)[2] justify the use of a modified bond test, called APULOT, to estimate the compressive strength of concrete, thereby increasing the possibilities for the technological control of reinforced concrete at construction sites. They propose an adaptation of the traditional pull-out test (POT) method, standardized by CEB/FIP RC6:1983[3], as this is a low complexity test with the advantage of reduced costs. The use of the APULOT test as a technological control test of concrete at construction sites requires determining a standard and also adapting it from the experimental laboratory practice to the field. The first part of this work evaluated the potential to perform compressive strength estimates from the bond strength data obtained by the POT test. The second part of this paper will present and discuss the test results achieved by the APULOT method. Two concrete compositions of different classes (25 MPa and 45 MPa) were tested at 3, 7 and 28 days. Ribbed bar specimens (nominal diameters of 8, 10 and 12.5 mm) were also used in the preparation stage of the specimens, totaling 144 APULOT tests. The results show that under standard test conditions, the correlation between the maximum bond strength and the compressive strength of concrete is satisfactory at all ages tested, corroborating the objective of consolidating this test as a complementary alternative for controlling the quality of reinforced concrete.

          Translated abstract

          EA presente pesquisa se propõe a estudar a viabilidade do uso de ensaios de aderência aço-concreto para estimativa da resistência à compressão axial do concreto, com o objetivo de empregá-los como um complemento no controle de qualidade do concreto armado. Lorrain e Barbosa (2008)[1]e Lorrain et al. (2011)[2]justificam a utilização de um ensaio de aderência modificado, denominado APULOT, para estimar a resistência à compressão do concreto, incrementando as possibilidades de controle tecnológico do concreto armado em canteiros de obras. Os mesmos propõem uma adaptação do método pull-out test (POT) tradicional, normalizado pela CEB/FIP RC6:1983[3], por ser este um ensaio de baixa complexidade e de custo reduzido. Para viabilizar o uso do ensaio APULOT como ensaio de controle tecnológico do concreto em canteiro de obras é necessário definir um padrão para o mesmo e adaptá-lo da prática experimental do laboratório para o campo. A primeira parte deste trabalho buscou avaliar a potencialidade de efetuar estimativas da resistência à compressão a partir dos dados da tensão de aderência obtidos com uso do POT. Na segunda parte deste trabalho serão apresentados e discutidos resultados de ensaios realizados com o método APULOT. Foram ensaiadas 2 composições de concreto de classes distintas (25 MPa e 45 MPa), aos 3, 7 e 28 dias. Foram, ainda, usadas na confecção dos corpos de prova barras nervuradas com diâmetros nominais de 8, 10 e 12,5 mm, totalizando 144 ensaios do tipo APULOT. Os resultados obtidos mostram que, sob condições padronizadas de ensaio, a correlação entre a tensão máxima de aderência e a resistência à compressão do concreto é satisfatória, em todas as idades ensaiadas, fortalecendo o propósito de consolidar este ensaio como uma alternativa complementar para controle de qualidade do concreto armado.

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          Most cited references9

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          Confinement effects on the steel–concrete bond strength and pull-out failure

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            Is Open Access

            Estimation of compressive strength based on Pull-Out bond test results for on-site concrete quality control

            Quality control of structural concrete has been conducted for several decades based mainly on the results of axial compression tests. This kind of test, although widely used, is not exempt from errors and has some considerable drawbacks that may affect its reliability, such as the need for appropriate and careful specimen conditioning and adoption of adequate capping techniques. For these reasons, it would be useful to have complementary or alternative ways to check compressive strength, in order to improve concrete quality control. The use of a bond test to monitor concrete strength is being proposed by an international group of researchers from France, Tunisia and Brazil as a potential means to this end. Given the fact that the link between bond resistance and concrete strength is already well established, this type of test seems to be a viable alternative to traditional methods. Nonetheless, to check if the underlying principle is sound when used in different circumstances, the group has been gathering data from several studies conducted by different researchers in various countries, with distinct concretes and rebar types. An analysis of the data collected shows that there is a clear and strong correlation between bond resistance and compressive strength, no matter the influence of other variables. This result validates the basic idea of using an Appropriate Pull-Out (APULOT) bond test to assess concrete strength. If the general principle is valid for random data obtained from different studies, the definition of a clear and appropriate test will probably lead to the reduction of experimental noise and increase the precision of the strength estimates obtained using this method.
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              Bond steel-concrete: simulation analysis of the pull-out tests and APULOT using the program ATENA


                Author and article information

                Revista IBRACON de Estruturas e Materiais
                Rev. IBRACON Estrut. Mater.
                IBRACON - Instituto Brasileiro do Concreto (São Paulo, SP, Brazil )
                October 2014
                : 7
                : 5
                : 856-878
                [01] Porto Alegre RS orgnameUnivesidade Federal do Rio Grande do Sul orgdiv1Programa de Pós Graduação em Engenharia Civil Brasil dovalesilvahotmail.com,lcarlos66@ 123456gmail.com
                [02] Ilha Solteira SP orgnameUnivesidade Estadual Paulista orgdiv1Departamento de Engenharia Civil Brasil mbarbosa@ 123456dec.feis.unesp.br
                [03] Toulouse orgnameInstitut National des Sciences Apliquées orgdiv1Département de Génie Civil França michel.lorrain@ 123456insa-toulouse.fr
                S1983-41952014000500008 S1983-4195(14)00700500008

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                : 15 March 2014
                : 15 July 2014
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 20, Pages: 23

                SciELO Brazil

                compressive strength of concrete,APULOT,pull-out,bond steel-concrete,resistência à compressão do concreto,aderência aço-concreto


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