Abstract
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.
Highlights
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
This study was conducted at UNESP/SP and is inserted in the APULOT research group composed of researchers from France, Brazil and other countries, which has been working on the improvement of a new test method based on the steel-concrete bond test: the pull-out test (POT), originally proposed as a recommendation from CEB/FIP RC6:1983[3], which is characterized by its simplicity and low cost
In continuity to Part 1 of this article presented in Vale Silva et al (2013)[4], which addressed standardized POT tests and its perspectives in determining the compressive strength of concrete, the objective of this second part is to analyze the results of another series of tests performed by the authors, which addressed the proposal of the APULOT method, using PET bottle molds as sample specimens, demonstrating that the tests can be performed in a simple manner, not entailing major technological devices
Summary
This study was conducted at UNESP/SP and is inserted in the APULOT research group composed of researchers from France, Brazil and other countries, which has been working on the improvement of a new test method based on the steel-concrete bond test: the pull-out test (POT), originally proposed as a recommendation from CEB/FIP RC6:1983[3], which is characterized by its simplicity and low cost. In continuity to Part 1 of this article presented in Vale Silva et al (2013)[4], which addressed standardized POT tests and its perspectives in determining the compressive strength of concrete, the objective of this second part is to analyze the results of another series of tests performed by the authors, which addressed the proposal of the APULOT method, using PET bottle molds as sample specimens, demonstrating that the tests can be performed in a simple manner, not entailing major technological devices. The same concrete compositions, test ages and types of reinforcement bars presented in part 1 of this article [4] were used, the anchorage length calculation was based on the new premise developed by Lorrain and Barbosa (2008) [1]
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