Mechanical property test of reinforcement


It is most commonly used for bridges, dams, roads and buildings. Common material property tests include tensile test, bending test and hardness test. The results of these tests are used to ensure that these products conform to the specified properties of the material and meet the grading requirements.


detailed information


Concrete usually has high compressive (push) strength, while tensile (pull) strength is generally weak. Therefore, the reinforcement is formed and embedded in the concrete to enhance its tensile strength. Most of the steel bars are deformed steel bars, which are formed in the production process to enhance its adhesion to the concrete. It is most commonly used for bridges, dams, roads and buildings. Common material property tests include tensile test, bending test and hardness test. The results of these tests are used to ensure that these products conform to the specified properties of the material and meet the grading requirements.


bend


The reinforcement is bent into different shapes to enhance the strength of the concrete upper structure. To prove that the material can be bent without obvious strength loss, three-point bending test can be used as a quality control inspection method to ensure the formability of the bar. This test usually requires bending the sample to a 90 degree or 180 angle along the bending center and checking whether there are cracks on its surface. International standards specify the relevant requirements for the diameter, bending angle and support span of the support roll.


Solution


Provide a series of bar bending clamps with adjustable bearing spans and replaceable bending centers, so that multiple sizes of bars can be tested with a single clamp. The bending fixture can be installed on any standard universal material testing machine and manufactured according to international standards. The Instron testing machine used for tensile test of complex reinforcement can also conduct simple bending test.



stretching


The steel bar sample often breaks violently under high load (accompanied by large recoil force). This kind of accident will bring problems to the vulnerable testing machine. In addition, it is difficult to clamp the irregular reinforcement surface because the teeth of the clamping surface are initially clamped on the convex part of the specimen. Without a suitable fixture surface, the specimen is easy to slide out of the clamp surface. When strain data are required for yield and modulus characteristics, specimen slip will greatly affect test results and pass/fail test criteria. The irregular surface of reinforcement also increases the difficulty of obtaining continuous and accurate strain data. Different from the processed sample, due to the irregular surface of the reinforcement, it is necessary to expand the gauge length (the elongation strain is averaged over the long gauge length) for testing.


Solution


A series of standard large load single test space and double test space test machines have adopted a variety of different beams and fixtures in their design,

It provides a user friendly solution for testing heavy large-sized steel bar samples. A series of V-groove clamps are specially provided for reinforcement test.