Steel reinforcing bars or rebar is used in concrete construction to provide tensile strength, complementing concrete’s excellent compressive properties. Rebar also helps maintain structural integrity as concrete cracks from expansion and contraction cycles. The tensile strength of rebar steel and the tensile rebar-concrete bond strength are extremely important properties of rebar. Tensile testing of rebar is relatively straightforward. No modifications to the material geometry are necessary as lengths of the actual rebar used are necessary to determine the strength and elongation of the rebar.
Testing may be used to determine basic properties, such as yield or proof stress and ultimate tensile strength plus elongation, alternatively it may be used to confirm proof load and ultimate load capacity of a component such as a bolt or weld. Standard metallic tensile tests at ambient temperature are carried out under the appropriate accreditation. Some of the common reasons for tensile testing are to determine the properties of an existing material in order to re-evaluate its performance for proposed new design calculations. We also conduct tensile tests as a control of material quality from a manufacturer or supplier. Tensile properties are sometimes required during failure investigations to confirm a material specification.
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