An accelerated loading device and method for indoor testing of pavement materials

Abstract

The invention discloses an accelerating and loading device for an indoor test of road surface materials. The accelerating and loading device comprises a thermostat, an operating desk, a tire, a motor, a transmission belt, a revolution indicator, a water pump, a water tank, a sprinkler head, a temperature sensor, a circulating air inlet, a circulating air outlet, a noise detector, a hydraulic device, a test specimen fastening module, a tension-compression type sensor, a self-lifting type testing wheel, a support wheel, a laser constructor and a computer, wherein the thermostat is positioned at the left side of a test device, the operating desk is positioned at the right lower side of the outer wall of the test device, the tire is positioned at the upper side of the thermostat, and the operating desk comprises a master switch, a rapid stop key, an accelerating operating desk, a loading operating desk, a temperature-control operating desk, a noise display, a water pump switch, a water pump operating knob and a motor switch. The accelerating and loading device for the indoor test of road surface materials is simple, applicable and reliable in operation, and can accurately simulate and detect the noise conditions, the anti-slide properties of test specimens and the mass loss rates of the test specimens of different road surface materials in environments of different temperatures, under different slippery degrees and under different loading effects.

Description

technical field [0001] The invention relates to an accelerated loading device and method for indoor testing of pavement materials, belonging to the field of material testing. Background technique [0002] Generally speaking, after the asphalt concrete pavement is completed and opened to traffic, under the accelerated loading of traffic loads, the pavement function gradually decays, the surface of pavement aggregates is gradually worn away, the polishing value decreases, and the pavement structure depth continues to decrease, showing an anti-corrosion effect. The phenomenon of reduced sliding performance; during the contact process between the driving tires and the road surface, the air is continuously compressed and released, which will generate driving noise and affect driving comfort. Due to the gradual change of the road surface structure under traffic operations, the noise intensity is also constantly changing; due to The loading, wear, impact and vibration of the wheels...

AI Technical Summary

Problems solved by technology

[0002] Generally speaking, after the asphalt concrete pavement is completed and opened to traffic, under the accelerated loading of traffic loads, the pavement function gradually decays, the surface of pavement aggregates is gradually worn away, the polishing value decreases, and the pavement structure depth continues to decrease, showing an anti-corrosion effect. The phenomenon of reduced sliding performance; during the contact process between the driving tires and the road surface, the air is continuously compressed and released, which will generate driving noise and affect driving comfort. Due to the gradual change of the road surface structure under traffic operations, the noise intensity is also constantly changing; due to The loading, wear, impact and vibration of the wheels on the road surface will cause the lack of fine aggregate on the road surface, and the road surface will show looseness, pitting and other diseases, especially in the rainy season, the dynamic water pressure on the road surface will cause water damage on the road surface , which in turn leads to damage to the pavement structure and shortens the service life of the road

[0003] Existing accelerated loading devices mostly use solid steel wheels or rubber wheels to carry out repeated loading tests on rut plate specimens. The trajectory of asphalt aggregate aggregate change by repeated loading is not consistent with the state of straight driving on the road surface. Research shows that, Different loading modes will have different effects on the arrangement of asphalt mixture aggregates after wheel grinding

Moreover, most of the test wheels currently used in indoor acceleration loading devices are towed, and they cannot drive and roll independently. They can only apply vertical force to the test piece, and cannot apply horizontal force. Realistically simulate the traffic load on the road surface, but cannot accurately evaluate the functional indicators of the road surface

Moreover, generally, the existing accelerated loading devices mainly carry out driving tests on asphalt mixture specimens under different loading environments and different loading times, and often cannot monitor the attenuation of the anti-skid performance of the test specimens during the test process. After the loading was stopped, the friction coefficient and structural depth of the specimen were measured by the pendulum instrument and the manual sand-laying method. These two anti-sliding indexes are greatly influenced by subjective factors, the test variability is large, and the representativeness of the test results is low. less efficient

When measuring the anti-skid index of the pavement, the lateral force coefficient is more accurate. At present, the lateral force coefficient is often used to check the anti-skid performance of the road surface in the completion acceptance of high-grade highways. However, the test cost of the lateral force coefficient is high, and the test conditions and methods are complicated. The lateral force coefficient is used to measure the antiskid performance of the test piece in the accelerated loading device of pavement materials

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