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Journal ArticleDOI

Fluid-Pressured Test to Measure Tensile Strength of Concrete

01 Apr 2014-Journal of Materials in Civil Engineering (American Society of Civil Engineers)-Vol. 26, Iss: 4, pp 776-780
TL;DR: In this article, a fluid-pressured test has been developed as an alternative to measure tensile strength of concrete, where a radial internal fluid pressure is applied until failure occurs.
Abstract: A fluid-pressured test has been developed as an alternative to measure tensile strength of concrete. This test method covers the determination of the tensile strength of cylindrical concrete specimens with a centered internal hole where a radial internal fluid pressure is applied until failure occurs. This loading condition induces tangential stresses on the specimen; the maximum fluid pressure sustained by the specimen is affected by appropriate geometric factors to obtain a measurement of the tensile strength. Preliminary experimental data suggests that the tensile strength measured with the proposed method is about 17% greater than the tensile strength obtained from splitting tensile tests. Additionally, results of the tensile pressure strength were on average 11% of the compressive strength.
Citations
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Journal ArticleDOI
TL;DR: The test results show that the concrete tensile strength obtained by this proposed method is close to the value obtained from the direct tension test for concrete with compressive strengths from 25 to 55 MPa.
Abstract: Tensile strength is one of the important mechanical properties of concrete, but it is difficult to measure accurately due to the brittle nature of concrete in tension. The three widely used test methods for measuring the tensile strength of concrete each have their shortcomings: the direct tension test equipment is not easy to set up, particularly for alignment, and there are no standard test specifications; the tensile strengths obtained from the test method of splitting tensile strength (American Society for Testing and Materials, ASTM C496) and that of flexural strength of concrete (ASTM C78) are significantly different from the actual tensile strength owing to mechanisms of methodologies and test setup. The objective of this research is to develop a new concrete tensile strength test method that is easy to conduct and the result is close to the direct tension strength. By applying the strut-and-tie concept and modifying the experimental design of the ASTM C78, a new concrete tensile strength test method is proposed. The test results show that the concrete tensile strength obtained by this proposed method is close to the value obtained from the direct tension test for concrete with compressive strengths from 25 to 55 MPa. It shows that this innovative test method, which is precise and easy to conduct, can be an effective alternative for tensile strength of concrete.

17 citations

Journal ArticleDOI
01 Jan 2018
TL;DR: In this article, the relationship between the radial stress and tangential stress when a hollow cylinder is subjected to an internal pressure (Pi) was evaluated and it was found that the value of tangential tensile stress at any point is equal to the minimum tangential stresses (it is present at the outer surface of the hollow cylinder) plus the values of the radial stresses at the evaluation point, which correspond to the suma entre el esfuerzo tangencial minimo (presente in la cara externa del cilindro bajo carg
Abstract: espanolEl presente articulo evalua la relacion que se presenta entre el esfuerzo radial y el esfuerzo tangencial cuando un cilindro hueco normalizado es sometido a una presion interna (Pi). En investigaciones anteriores, los autores reportaron una nueva metodologia para generar una falla por traccion en cilindros de concreto huecos. Al ser un metodo innovador, para comprender la situacion de los esfuerzos en la probeta, es importante establecer las relaciones entre los esfuerzos y su grado de correlacion. En este articulo se encuentra reflejado como varian los valores de los esfuerzos de acuerdo a los diferentes valores de radio interno (ri) para cilindros huecos. Como resultado de la investigacion se encontro que el valor del esfuerzo tangencial obedece al aporte de dos tipos de esfuerzo, es decir, corresponde a la suma entre el esfuerzo tangencial minimo (presente en la cara externa del cilindro bajo carga) y el valor del esfuerzo radial en el punto de evaluacion. El esfuerzo maximo por traccion se presentara siempre en la cara interna del cilindro hueco y siempre a un valor de esfuerzo tangencial mayor al aplicado como Pi. EnglishThis article evaluates the relationship between the radial stress and tangential stress when a hollow cylinder is subjected to an internal pressure (Pi). In previous research, authors reported a new methodology to generate a tension strength test in hollow concrete cylinders. As a novel method, to understand the stress behaviour on the probe, it is important to establish relationships between these stresses and its correlations. This article reflects how these stresses vary according to the different internal radius (ri) for hollow cylinders. As result of this evaluation, it was found that the value of tangential stress at any point is equal to the minimum tangential stress (it is present at the outer surface of the hollow cylinder) plus the value of the radial stress at the evaluation point. The maximum tensile stress always occurs at the internal surface of the cylinder and at a value for tangential stress higher than Pi.
Patent
29 Apr 2020
TL;DR: In this article, a machine for tensile and compression testing of hollow cylinders is described. The machine comprises an open container in which the hollow cylinder is arranged, and inside the cylinder there is an expanding cylindrical membrane, which is connected to a pressure unit that supplies a pressurized fluid to the expanding membrane.
Abstract: The present invention corresponds to a machine for testing mechanical properties of hollow cylinders. The machine comprises an open container in which the hollow cylinder is arranged. Inside the hollow cylinder there is an expanding cylindrical membrane, which is connected to a pressure unit that supplies a pressurized fluid to the expanding membrane. A valve and a pressure sensor are located between the pressure unit and the expanding cylindrical membrane. A control and data capture system is connected to the pressure unit, the valve and the pressure sensor. The machine performs tensile and compression tests on hollow cylinders.
References
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Journal ArticleDOI
TL;DR: In this article, the effects of concrete strength on the modulus of elasticity, tensile strength (flexural and splitting tensile), and Poisson's ratio of concrete are discussed.
Abstract: This paper discusses some important engineering properties of plain concrete for a wide range of compressive strength. A large volume of selected experimental data has been collected from existing literature and then analyzed. Particular emphasis has been given to studying the effects of concrete strength on the modulus of elasticity, tensile strength (flexural and splitting tensile), and Poisson’s ratio of concrete. Study on the effect of the size of specimens on the compressive strength and modulus of elasticity of concrete has also been included. The adequacy of some of the familiar relationships for predicting the modulus of elasticity and tensile strengths of concrete has been critically examined, and suitable expressions are suggested to cover concrete strength up to 120 MPa.

153 citations

Journal ArticleDOI
TL;DR: In this paper, an overview of methods to determine the strength and fracture energy of concrete subjected to uniaxial tension is given, which can be transferred directly to studies of other quasi-brittle geo-materials like natural rocks, clay and ice, fired clay bricks, plaster and the like.

121 citations

Journal ArticleDOI
TL;DR: In this article, the size effect caused by energy release due to fracture growth during brittle failures of concrete structures is verified for diagonal shear failure and torsional failure of longitudinally reinforced beams without stirrups, punching shear failures of slabs, pull-out failures of deformed bars and of headed anchors, failure of short and slender tied columns, double-punch compression failure, and splitting failure of concrete cylinders in the Brazilian test.
Abstract: The paper reviews experimental evidence on the size effect caused by energy release due to fracture growth during brittle failures of concrete structures. The experimental evidence has by now become quite extensive. The size effect is verified for diagonal shear failure and torsional failure of longitudinally reinforced beams without stirrups, punching shear failure of slabs, pull-out failures of deformed bars and of headed anchors, failure of short and slender tied columns, double-punch compression failure and for part of the range also the splitting failure of concrete cylinders in the Brazilian test. Although much of this experimental evidence has been obtained with smaller laboratory specimens and concrete of reduced aggregate size, some significant evidence now also exists for normal-size structures made with normal-size aggregate. There is also extensive and multifaceted theoretical support. A nonlocal finite element code based on the microplane model is shown to be capable of correctly simulating the existing experimental data on the size effect. More experimental data for large structures with normal-size aggregate are needed to strengthen the existing verification and improve the calibration of the theory.

73 citations

Journal ArticleDOI
TL;DR: In this paper, a novel indirect tensile test method, the biaxial flexure test (BFT) method, has been developed to measure the BFT strength of concretes.

41 citations

Journal ArticleDOI
TL;DR: In this article, the Brazilian cylinder splitting test is analyzed using isoparametric nonlinear finite strip elements and the results of the numerical analysis suggest that the apparent tensile strength obtained from the splitting test underestimates the uniaxial strength of concrete.
Abstract: The widely used concrete tensile strength test, the Brazilian cylinder splitting test, is analyzed using isoparametric nonlinear finite strip elements. The results of the numerical analysis suggest that the apparent tensile strength obtained from the splitting test underestimates the uniaxial tensile strength of concrete. After investigating the effects of various concrete properties and the packing strip width in the splitting test, a simple method for correcting this underestimation is established.

28 citations