Test device and test method of shearing strength of UHPC-NC (Ultrahigh Performance Concrete-Normal Concrete) boning interface

Abstract

The invention discloses a test device and a test method of the shearing strength of a UHPC-NC (Ultrahigh Performance Concrete-Normal Concrete) boning interface. The test device comprises an upper testmachine pressure plate, an axial pressure applying device, anti-dropping steel wire ropes, an upper steel fixture, a UHPC-NC laminated test piece, a lower steel fixture, steel roller shafts and a lower test machine pressure plate, wherein the laminated test piece is formed by laminating prefabricated ultrahigh performance concrete and cast-in-place normal concrete. The test device of the shearingstrength of the UHPC-NC boning interface is welded from steel, so that sufficient rigidity and strength of the test device are guaranteed. By the test method of the shearing strength of the UHPC-NC boning interface, a relationship between a normal compressive stress and a shear stress can be intuitively studied. The test device and the test method have the advantages of clear force performance, convenience and fastness in operation, strong repeatability, simple test result analysis and the like, and an effective test method is provided for interface bonding research of an UHPC-NC laminated component.

Description

technical field [0001] The invention belongs to the field of test methods, and in particular relates to a test device for the shear strength of a bonded interface of a UHPC-NC laminated component and a test method thereof. Background technique [0002] Ultra-high performance concrete (UHPC) is a new type of cement-based material with high strength and high durability. However, the price of UHPC material is several times higher than that of ordinary concrete, so it is not suitable for large-scale use. Therefore, the use of UHPC materials in key parts of the structure, or mixed with ordinary concrete (NC), will have a wide range of engineering application prospects. [0003] In order to ensure that UHPC materials can work together with ordinary concrete and form a whole, it is necessary to study the bonding problem between UHPC materials and ordinary concrete. The interface shear strength of UHPC-NC laminated components is an important design index in practical engineering, a...

AI Technical Summary

Problems solved by technology

The disadvantages of this test method are that the size of the specimen is large and the normal stress is difficult to control accurately.

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