Semi-rigid base asphalt pavement reflection crack testing device

Abstract

The invention discloses a semi-rigid base asphalt pavement reflection crack testing device. The semi-rigid base asphalt pavement reflection crack testing device adopts the structure as follows: a steel tank is filled with a subgrade, a subbase, a semi-rigid base, a sealing layer and a surface layer are sequentially from bottom to top; a first steel plate and a second steel plate are vertically embedded into the semi-rigid base; a steel tube is horizontally embedded into the semi-rigid base and penetrates through the steel tank; a dowel bar penetrates through one end of the steel tube and is welded to the second steel plate; the other end of the dowel bar is connected with a hollow hydraulic jack through a nut; the bottom of the hollow hydraulic jack is connected with the steel tank through a bolt; a displacement sensor is in horizontal contact with the free end of the dowel bar; a crack meter is embedded into the surface layer. The semi-rigid base asphalt pavement reflection crack testing device is simple in structure and convenient to use, particularly, can control the expansion speed of an semi-rigid base crack by controlling the jacking rate of the hollow hydraulic jack, and can simulate influence of different extension rates of the semi-rigid base crack on an evolution law of the asphalt pavement reflection crack, so that the semi-rigid base asphalt pavement reflection crack testing device enables indoor test accuracy to be higher, more reliable and more effective.

Description

technical field [0001] The present invention relates to a technical field for testing reflective cracks of semi-rigid base asphalt pavement, more specifically to a test device for reflective cracks of semi-rigid base asphalt pavement, which is suitable for simulating reflective cracks of semi-rigid base asphalt pavement Experiments in generation, expansion and evolution. Background technique [0002] The semi-rigid base of asphalt concrete pavement is made of cement, lime, fly ash and other inorganic binding forces to stabilize soil or aggregates, which are paved and rolled. It is mainly used for pavement bases, and its stiffness is between rigid materials (cement concrete) And flexible material (asphalt mixture), so it is usually called semi-rigid base. Because the semi-rigid base has good plate characteristics and high strength, it can effectively improve the bearing capacity of the asphalt pavement structure, facilitate the spread of loads, reduce the vertical compre...

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Problems solved by technology

[0006] However, cracks in the semi-rigid base layer are generated under the coupling of load-temperature-humidity, and the timing and location of the cracks are difficult to predict, making it difficult for researchers to observe. Therefore, it is necessary to invent a new test device to simulate the induction of cracks in the semi-rigid base layer. The generation and development of launch cracks on asphalt pavement, and the observation and research on the reflective cracks of semi-rigid base asphalt concrete pavement and the anti-crack performance of asphalt concrete

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