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Published in:
2018 | Supplement | Chapter
Determination of the Uniaxial Tensile Strength of Concrete with a Modified Test Setup
Authors : Christian Neunzig, Thomas Heiermann, Michael Raupach
Published in: Strain-Hardening Cement-Based Composites
Publisher: Springer Netherlands
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Abstract
While the testing of the compressive strength of cement-bound materials is regulated by norms and only differentiates in the dimensions and shapes of the specimens to be tested (cube, cylinder, prism), such standards are missing for the determination of the uniaxial tensile strength. The test methods known from literature which can be used to determine the uniaxial tensile strength, are partly associated with a high test effort, cannot ensure introducing the tensile force centrically or determine the tensile strength only indirectly via a conversion, e.g. from the flexural strength or the splitting tensile strength.
In the evaluation of uniaxial tensile tests on textile reinforced concretes and fiber reinforced concretes, the tensile strength of the concrete and the interaction of the concrete with the textile is currently not or only indirectly taken into account. This is partly due to difficulties in ensuring that the specimen is tested centrically or due to time-intensive test methods for determining the centric tensile strength of the non-reinforced concrete. Based on the ASTM C307-03, a test device was developed which, reproducibly and time-reliably, allows measuring the maximum centric tensile load of concrete. It is also possible to use coarse-grained concrete with a maximum grain size of up to 16 mm. With the help of the new test setup, the test specimens can be examined immediately after the curing. A lengthy preparation time, such as the grinding of test specimens or the hardening time of an adhesive, is no longer necessary.
During initial investigations with the developed test setup, standard concretes and an ultra-high-performance concrete (UHPC) with and without steel micro-fibers were examined.