Steel fiber pull-out test piece pouring mold, pouring method and bond slip test method

Abstract

The invention discloses a steel fiber pull-out test piece pouring mold, a pouring method and a bonding slip test method. The mold comprises a bottom plate (1), a pair of top plates (2), a scale plate(3), bolts and nuts (4), bolt holes (5) and a slice (7), wherein the top plates and the scale plate are arranged on the bottom plate through bolts and nuts by passing through the bolt holes, the scaleplate is positioned between the pair of top plates, the top plates are provided with a test piece pouring hollowed-out part (21) used for pouring concrete, the test piece pouring hollowed-out part penetrates through the top plates, the scale plate is provided with scale marks (8), the slice covers an opening end of the test piece pouring hollowed-out part, one end of a steel fiber is inserted into the test piece pouring hollowed-out part along the scale marks, and the other end penetrates through the slice. The mold is advantaged in that a test piece type, a fiber type, an angle and burial depth are variable, test piece manufacturing efficiency and the pouring quality are improved, during testing, a test piece can be stably clamped, the more accurate fiber bonding slip relation can be measured, mounting, dismounting and cleaning are convenient, and test cost is effectively reduced.

Description

technical field [0001] The invention relates to a test piece mold, a test piece pouring method and a performance testing method of an ultra-high performance concrete material, in particular to a steel fiber pullout test piece pouring mold, a pouring method and a bond slip test method. Background technique [0002] Concrete is one of the most used civil engineering materials. With the construction of large-scale engineering structures, ordinary concrete is increasingly unable to meet the requirements of engineering structures under complex environments and loads due to problems such as high brittleness, easy cracking, low strength, and long maintenance periods. Although high-strength concrete can increase the compressive strength of concrete, it cannot improve the brittleness. Fiber-reinforced concrete can improve the ductility of concrete, but the tensile stress-strain curve of fiber-reinforced concrete is strain-softening. In recent years, ultra-high-performance concrete ...

AI Technical Summary

Problems solved by technology

Finally, due to the small pull-out load of the steel fiber and the small amount of fiber slippage, the range of the load sensor of the testing machine is often much larger than the required observation amount. Many researchers regard the displacement of the beam of the testing machine as the fiber slippage, and the resulting measurement error will significantly affect the accuracy of test results

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