Asphalt mixture fatigue loading device capable of simulating sudden change of ambient temperature

Abstract

The invention relates to an asphalt mixture fatigue loading device capable of simulating the sudden change of ambient temperature. The device comprises an environmental box and a test piece bearing plate which is arranged in the environmental box and can slide back and forth along the horizontal direction, wherein the environmental box is divided into a high-temperature environmental box and a lower-temperature environmental box by means of a thermal insulation board; the high-temperature environmental box and the lower-temperature environmental box are separately provided with a loading wheelwhich can apply pressure toon a test piece to be tested and can slide back and forth along the horizontal direction; the loading wheels are positioned above the test piece bearing plate and are connected with a first power device respectively by means of a force transmission rod; the thermal insulation board can be rotated to a state that the bottoms of the thermal insulation board is loading wheels and at the position higher than the test piece bearing plate; the high-temperature environmental box is internally provided with a heating device, and the lower-temperature environmental box is internally provided with a refrigerating system; temperature sensors are respectively installed in the high-temperature environmental box and the lower-temperature environmental box; each force transmission rod is provided with a displacement sensor and a pressure sensor; the temperature sensors, the displacement sensors and the pressure sensors are separately connected with a control panel. After the asphalt mixture fatigue loading device is used, a fatigue resistance test of an asphalt mixture can be completed under the condition of the sudden change of the temperature.

Description

technical field [0001] The invention belongs to the technical field of asphalt mixture fatigue loading equipment, in particular to an asphalt mixture fatigue loading device for simulating sudden changes in ambient temperature. Background technique [0002] Nowadays, with the rapid development of highway construction, highway workers not only pay attention to the early performance of asphalt mixture, but also attach great importance to the durability of asphalt mixture, that is, the fatigue performance of asphalt mixture. Fatigue refers to a failure phenomenon in which the pavement cracks when the material is subjected to repeated loads far below its ultimate strength. The fatigue performance of asphalt mixture is its ability to resist such fatigue damage under repeated loads. At present, the methods for testing the fatigue performance of asphalt mixture can be roughly divided into indoor and outdoor methods. Both test offenses have advantages and disadvantages. However, n...

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Problems solved by technology

[0004] 1. Outdoor test methods such as loop test and accelerated loading test are costly and long-term, and the test results are greatly affected by the local environment and the pavement structure used

[0005] 2. The indoor test cannot simulate the comprehensive stress state of the pavement unit well, which is different from the actual fatigue effect

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