Fixture for detecting bonding performance of fiber cement substrate and detection method

Abstract

The invention discloses a fixture for detecting the bonding performance of a fiber cement substrate and a detection method. The fixture comprises an upper cylindrical connecting seat and a lower cylindrical connecting seat which are connected with the supporting sleeve of a drawing test machine; the upper cylindrical connecting seat and the lower cylindrical connecting seat are respectively connected with an upper clamp and a lower clamp through an upper force transmitting screw and a lower force transmitting screw; the upper clamp includes an inverted-U-shaped steel frame and a perforated steel plate; the lower clamp comprises a U-shaped steel frame, a rigidity support and a wire winding roller shaft; the wire winding roller is movably sleeved with an annular clamping tool; the annular clamping tool is provided with a locking bolt; the annular clamping tool presses the wire winding roller shaft through the locking bolt; and an extensometer is vertically disposed between the upper clamp and the lower clamp. The fixture is reasonable in design and is locked by means of a winding mode. The fixture is suitable for samples such as fibers or metal wires that are difficult to clamp and easy to break. With the fixture and detection method adopted, various links in the bonding force test of fibers such as steel fibers, and flexible fibers, and cement substrates, have high coordinationperformance, the efficiency of the test can be performed, and the accuracy of the test can be ensured.

Description

technical field [0001] The invention discloses a fixture and a testing method for detecting the bonding performance of fiber cement substrates, and belongs to the technical field of fiber dynamic stretching fixtures. Background technique [0002] Concrete is the most widely used civil engineering material in today's human society. It has high compressive strength, but has disadvantages such as low tensile strength, poor crack resistance and high brittleness. Its tensile strength is only 1 / 10 to 1 / 7 of the compressive strength, and its ultimate elongation is only 0.01% to 0.06%. It is prone to cracking at lower tensile deformation. With the substantial increase in the compressive strength of concrete materials, the problems of shrinkage and brittleness are also more prominent. It is impossible to solve the above-mentioned shortcomings of concrete through the improvement of its own material, only the "composite" technical approach is adopted. As a result, fiber-reinforced co...

AI Technical Summary

Problems solved by technology

Generally, the flexible fiber cannot be directly clamped in the test, and the brittleness of the fiber often causes it to break during the clamping process. Even if the clamping is successful, the clamping end will damage the fiber, and the fiber will break at the jaw. , the measured data cannot reflect the real characteristics of the fiber

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