Testing device of rigid and flexible composite test piece asphalt layer rebound modulus and method thereof

Abstract

The invention discloses a testing device of rigid and flexible composite test piece asphalt layer rebound modulus and a method thereof; the device comprises a loading system, a clamping system and a data collecting system; the loading system is a MTS hydraulic servo material tester; the clamping system respectively comprises a shaft coupler, a clamp, a rotary button, a pressing head, a blocking base and a rubber cushion from top to bottom; through the shaft coupler, the clamping system is closely meshed with the loading system; a real road structure is simulated through the rigid and flexible composite test piece and the rubber cushion naturally placed beneath the test piece; the composite test piece is loaded through the pressing head, and the clamping data collecting system measures the stress and strain of the composite test piece asphalt layer during the loading process; through processing and calculating the measured stress and strain data, the test of the composite structural asphalt layer rebound modulus can be realized finally.

Description

technical field [0001] The invention belongs to the field of road engineering, and relates to a test device and method for the elastic modulus of an asphalt layer of a rigid-flexible composite test piece. Background technique [0002] The combination of rigid base and asphalt pavement is one of the main structural forms of long-life pavement. Due to the large difference in rigidity between the surface and the base, it is also commonly called rigid-flexible composite pavement, which exists in new roads and old pavement reconstruction. And cement concrete bridge deck asphalt pavement and other projects. [0003] For the rigid-flexible composite pavement structure, the current research focuses on the mechanical analysis and structural design of the rigid base, and less research on the upper asphalt layer. Its design and construction often refer to the design theory and method of semi-rigid base asphalt pavement, and The research on the mechanical behavior and structural charac...

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Problems solved by technology

Considering that the pavement structure under the action of traffic load mainly bears the vertical load, most domestic and foreign industry standards use the compressive rebound modulus as the modulus parameter to guide road design and research, but unfortunately, many models at home and abroad currently Quantitative test methods are all directly measuring the rebound modulus of single-material asphalt mixture. This kind of test method does not take into account the influence of interlayer bonding state, structural stiffness combination and soft soil foundation, etc., and cannot accurately reflect the rebound modulus of the asphalt layer. The evolution law under load is not suitable for measuring the rebound modulus of asphalt pavement of rigid-flexible composite specimens

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