Determination of the Uniaxial Tensile Strength of Concrete with a Modified Test Setup

Neunzig, Christian; Heiermann, Thomas; Raupach, Michael

doi:10.1007/978-94-024-1194-2_37

Cited by 5 publications

(14 citation statements)

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“…One series consisted of three cubes each with a length of 100 mm and six tensile bone samples according to ASTM C307-03 [ 20 ] (heat treated series) and seven tensile bone samples (autoclaved series). The same geometry as in [ 13 ] was used for the tensile bones. The length of the specimen was 228.6 mm and the smallest cross-sectional area was 76.5 mm × 76.5 mm.…”

Section: Methodsmentioning

confidence: 99%

“…In order to determine the centric tensile strength of UHPC 1 and UHPC 2 test specimens, the test set-up presented in [ 13 ] was applied. For this purpose, the “briquette test specimens” similar to ASTM C307-03 [ 19 ] were used with the geometric dimensions enlarged by a factor of 3.…”

Section: Methodsmentioning

confidence: 99%

“…The principal test setup is shown in Figure 3 . The investigations from [ 13 , 19 ] show that the scattering is significantly lower compared to cylindrical test specimens. The four articulated rollers allow an almost centric force application into the specimen.…”

Section: Methodsmentioning

confidence: 99%

“… ( a ) The test setup for determining the centric tensile strength according to studies of Neunzig et al [ 13 ]; ( b ) technical drawing of the test setup for determination of the centric tensile strength according to studies of Neunzig et al [ 13 ]. …”

Section: Figurementioning

confidence: 99%

“…The tensile strength is influenced by several parameters. These mainly include the concrete composition, environmental conditions, test setup [ 13 ], specimen geometry [ 12 ], loading speed [ 14 , 15 , 16 , 17 ] or a possible preload.…”

Section: Introductionmentioning

confidence: 99%

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Influence of High Temperature Curing and Surface Humidity on the Tensile Strength of UHPC

2021

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The objective of this study is an investigation of the different parameters that influence the tensile strength of ultra-high performance concrete (UHPC). Apart from the shrinkage and stiff-ness, the tensile strength is an important parameter for the design of crack-free concrete elements, e.g., in machine tool construction. One focus of our work is the influence of concrete curing and the great impact of the mechanical and physical characteristics of hydrated UHPC. For this reason, different curing regimes were investigated. The results show that even after heat treatment or autoclaving, the centric tensile strength of UHPC specimens is strongly influenced by the surrounding ambient humidity. Test specimens that were stored under water after a heat treatment or autoclaving and were still wet during the test had the highest tensile strengths. Storage at 20 °C and 65% relative humidity (rH), however, results in a 25% reduction in tensile strength. Alternating storage between water storage at 20 °C water and storage at 65% rH can also reduce the tensile strength dramatically by up to 70%. In particular, samples that were stored at 65% rH right before testing had very low tensile strengths. Surprisingly, the initially low tensile strength of previously dry stored UHPC can be restored by subsequent water storage. In the absence of any microstructural defects, e.g., microcracks, a possible explanation for this phenomenon can be the stress differences due to a humidity gradient between the core and surfaces and shrinkage combined with a continued reaction of the unhydrated binders of the UHPC.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of High Temperature Curing and Surface Humidity on the Tensile Strength of UHPC

2021

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Influence of steel fiber on compressive properties of ultra-high performance fiber-reinforced concrete

Yang

Chen

Nuti

2021

Construction and Building Materials

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Direct tensile tests on steel fiber reinforced concrete with focus on wall effect and fiber orientation

Faustmann,

Kronau,

Fischer

2024

Mater Struct

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Adding steel fibers to concrete essentially improves its post-crack tensile properties. To determine this experimentally, indirect methods, such as flexural tensile tests, are generally used, which allow only indirect conclusions about the material´s tensile properties. In contrast, direct tensile tests provide the desired result immediately, but are difficult to realize. A key parameter affecting the performance of the SRFC is the orientation of the fibers, which is mainly influenced by the manufacturing process. Typically, when the concrete is cast, the steel fibers align with the edges of the formwork. This is commonly called the wall effect. We address these issues, presenting the setup and results of direct tensile tests on bone shaped specimens with three different steel fiber contents. For each content, a series of specimens with a three-sided formwork (i.e. three-sided wall effect and strong influence on the fiber orientation) and a series with cut-out bones (i.e. one-sided wall effect and less influence on fiber orientation) were fabricated and tested. After these tests, the fiber orientation was determined using an opto-analytical method to quantify the influence of the manufacturing methods on the fiber orientation. Comparing the stress-crack-opening relationships shows that the cut specimens at 0.5 mm crack openings have only about 80% of the tensile strength of three-sided formwork specimens. This effect decreases with larger crack openings and vanishes at about 3 mm crack opening. Finally, a new fiber reinforcement index is defined to correlate observed stress in direct tensile tests to fiber content and orientation in direct tensile tests.

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Determination of the Uniaxial Tensile Strength of Concrete with a Modified Test Setup

Cited by 5 publications

References 1 publication

Influence of High Temperature Curing and Surface Humidity on the Tensile Strength of UHPC

Influence of High Temperature Curing and Surface Humidity on the Tensile Strength of UHPC

Influence of steel fiber on compressive properties of ultra-high performance fiber-reinforced concrete

Direct tensile tests on steel fiber reinforced concrete with focus on wall effect and fiber orientation

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