AllroundLine for individual testing requirements and all applications
Because concrete has high compressive strength but lower tensile strength, it is reinforced by embedding steel in it. Reinforcing steels are mainly produced in diameters from approx. 5 mm to approx. 60 mm. The smaller diameters are then further processed into mats or lattices before having concrete poured over them on site. Testing these ribbed steels poses a particular challenge because, apart from cutting to length, no further mechanical specimen preparation takes place. The necessary strain measurement at the specimen for accurate determination of the yield point is almost always determined with the makro extensometer. It accurately records the strain up to break without being affected itself. The makro extensometer is distinguished by
Flexure tests on reinforcing steel are used to test ductility. The specimen must not lose strength and no cracks must be detected on visual inspection. Various die radii and anvils are specified, depending on the standard, the bending angle as a rule being 90° or 180°. For this test ZwickRoell supplies hydraulic testing machines and flexure test kits as per standards. If required two test areas can be installed on electro-mechanical testing machines and used for flexure and tensile tests, eliminating the need to modify the test arrangement.
Reinforcing steel is produced in large quantities and must be continually tested for production monitoring. ZwickRoell has developed automated systems in which specimens cut to length from rod material or separated from mats and lattices are loaded manually into magazines, after which they are tested completely automatically. Artificial aging at 100° C can also be integrated into this type of testing system. Cross-sections are measured with high accuracy and in accordance with standards and specimens can be sorted according to test result for later visual inspection.