New model for the indirect determination of the tensile stress–strain curve of concrete by means of the Brazilian test

Carmona, Sérgio; Aguado, Antonio

doi:10.1617/s11527-012-9851-0

Cited by 70 publications

(33 citation statements)

References 18 publications

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“…In the BT, the specimen must fail along the vertical line between compression points; otherwise, the observed failure mode is considered invalid (Li and Wong 2013). The test typically ends with a sudden, violent failure of the specimen when it reaches the maximum load due to the propagation of an unstable crack (Carmona and Aguado 2012).…”

Section: Introductionmentioning

confidence: 99%

“…One can gain an idea of its impact if one considers that the use of concrete test specimens has been standardized into norms in various countries, such as UNE-EN 12390-6, ASTM C-496, and CPC6 (Carmona and Aguado 2012). In 1951, the BT was standardized in the Japanese industry as a test method for determining the TS of concrete (Kourkoulis et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Brazilian Test of Concrete Specimens Subjected to Different Loading Geometries: Review and New Insights

García

Márquez

Zúñiga-Suárez

et al. 2017

Int J Concr Struct Mater

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The objective of this work was finding out the most advisable testing conditions for an effective and robust characterization of the tensile strength (TS) of concrete disks. The independent variables were the loading geometry, the angle subtended by the contact area, disk diameter and thickness, maximum aggregate size, and the sample compression strength (CS). The effect of the independent variables was studied in a three groups of experiments using a factorial design with two levels and four factors. The likeliest location where failure beginning was calculated using the equations that account for the stress-strain field developed within the disk. The theoretical outcome shows that for failure beginning at the geometric center of the sample, it is necessary for the contact angle in the loading setup to be larger than or equal to a threshold value. Nevertheless, the measured indirect tensile strength must be adjusted to get a close estimate of the uniaxial TS of the material. The correction depends on the loading geometry, and we got their mathematical expression and cross-validated them with the reported in the literature. The experimental results show that a loading geometry with a curved contact area, uniform load distribution over the contact area, loads projected parallel to one another within the disk, and a contact angle bigger of 12°is the most advisable and robust setup for implementation of BT on concrete disks. This work provides a description of the BT carries on concrete disks and put forward a characterization technique to study costly samples of cement based material that have been enabled to display new and improved properties with nanomaterials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Brazilian Test of Concrete Specimens Subjected to Different Loading Geometries: Review and New Insights

García

Márquez

Zúñiga-Suárez

et al. 2017

Int J Concr Struct Mater

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“…1. The load (P) applied on two diametrically opposite generatrices produces vertical compressive and horizontal tensile stresses at the centre of the cube as follows [26][27][28]:…”

Section: Tensile Split Testmentioning

confidence: 99%

Bond between microwave cured repair and concrete substrate

2017

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The bond strength between a concrete substrate and repair patch is critical to its durability. This paper investigates the effect of microwave curing the freshly applied repair, for 45 min at 132 Watts, on the 28 day bond strength between substrate concrete and different commercial repair materials. The repairs were applied at different ambient temperatures of 20, 10, 2 and -5°C. Tensile split tests on repaired cube specimens were performed to determine the interfacial bond strength. The ability of microwave curing to prevent the detrimental effects of freezing at early age on the bond and compressive strength of repair patches is investigated. Experimental results show that microwave curing prevents loss of long term (28 day) repair/substrate bond strength of repair materials applied at freezing temperatures (-5°C), relative to the repairs applied at higher temperatures (2-20°C), except one lightweight repair formulation. In comparison, the control samples (non-microwave cured) of repairs applied at -5°C suffered severe loss of bond strength and compressive strength due to early age freezing. In addition, no adverse effects on the bond strength and a small reduction of 6.75% in the 28 day compressive strength are observed in the early age microwave cured repairs applied at ambient temperatures of 2-20°C. The repair/substrate bond strength is independent of the compressive strength of the repair material at all temperatures of repair application. Microwave curing can accelerate the concrete repair process and facilitate construction activity in cold weather.

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“…[22]. Specimen/test #5, reported in Denneman [21], as well as specimens/tests #6 and #7, analyzed by Carmona and Aguado [13], refer to plain concrete. Moreover, specimens #5 and #6 have again diameter d = 150 mm and length L = 300 mm whereas specimen #7 keeping L = 300 mm has d = 300 mm.…”

Section: Case Study #2: Splitting Tensile Test On Cylindrical Specimensmentioning

confidence: 99%

A kinematic approach for peak load evaluation of concrete elements

Pisano

Fuschi

Domenico

2013

Computers & Structures

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New model for the indirect determination of the tensile stress–strain curve of concrete by means of the Brazilian test

Cited by 70 publications

References 18 publications

Brazilian Test of Concrete Specimens Subjected to Different Loading Geometries: Review and New Insights

Brazilian Test of Concrete Specimens Subjected to Different Loading Geometries: Review and New Insights

Bond between microwave cured repair and concrete substrate

A kinematic approach for peak load evaluation of concrete elements

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