Tensile Strength of Basalt Fiber Reinforced Plastic (BFRP) Rebar
Basalt is a natural hard, dense, dark brown to black volcanic igneous rock. It is the most common rock type in the earth’s crust. Its origins are at a depth of hundreds of kilometers beneath the earth and reach the surface as molten magma. The volcanic rock in general is widely available in various regions of the world. Basalt finds its way into wide application in industry as abrasion, wear and chemical resistant materials. In recent years a new type of FRP composite material has been developed called Basalt Fiber Reinforced Plastic (BFRP) material. The characteristics of this material have various beneficial features such as high strength-to-weight ratio, lower specific weight and excellent corrosion and fatigue resistance. Nowadays this material is finding their way to more novel applications in relation to civil engineering structures. The use of Basalt in rebar applications, the physical testing results have shown to have ultimate tensile strength which is up to 4 times higher than the tensile strength of conventional steel rebar.
For the tensile testing of BFRP composite rebar, it is important that the specimens are prepared with tabbed ends in order to guarantee an adequate clamping of the specimen. This ensures that specimen breaks occur within the gauge length and not within the jaw face. For this test, we recommend the use of the model 5985 floor test system, 250kN capacity for tensile testing applications.
Before starting the test, the specimen is measured, then placed into 250kN hydraulic wedge grips. During the gripping process of the specimen, specimen protect feature is selected that allows you to set a load threshold that won't be exceeded until the test is started. A strain gauged clip-on extensometer; 25mm gauge length with 10% travel capability is attached to the specimen.
Bluehill 3 test software package is used to input specimen parameters, set the desired test speed control, automatically calculate the desired results and statistics, and finally produce a test report.
5900 Universal Testing Systems are engineered for precision, built for durability, and offer the flexibility for changing requirements. They are designed with standard and optional features that increase testing efficiency and improve the testing experience for the operator. A wide range of models are available for testing capacities from < 100N up to 600kN.
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Bluehill Universal Software is built from the ground-up for touch interaction and an intuitive user experience. Discover simpler and smarter testing with features such as pre-loaded test methods, QuickTest in seconds, enhanced data exporting: and Instron Connect – a new feature that provides a direct communication link to Service. Users of previous versions of software such as Bluehill 2 and Bluehill 3 can easily upgrade to the newest version of Bluehill.
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The 2630-100 series of extensometers offers speed of attachment and ease-of-use. The light-weight, rugged cross-brace design eliminates errors caused by physical distortion, while built-in protection ensures that damage is not caused by over-extension. The low operating-force arms of the extensometer reduce the possibility of knife-edge slippage when testing hard or smooth surfaced materials.
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