A freeze-thaw cycle fatigue test method for asphalt mixture in permafrost regions

Abstract

The invention discloses a freezing and thawing cycle fatigue testing method of asphalt mixture in a permafrost region. The method comprises the steps of forming a prism beam type test part, saturating the prism beam type test part and freezing and thawing to simulate the freezing and thawing phenomenon caused by large temperature difference between day and night in the permafrost region, carrying out fatigue testing with certain loading times on the basis to simulate the repeated actions of the vehicle load, alternatively repeating the freezing and thawing tests and the fatigue tests until the prism beam type test part is fatigued and destroyed, so that the synthesized fatigue action of the reaction weather condition and the vehicle load is synthesized. The freezing and thawing cycle and the fatigue testing are repeated, so that the testing data has practical significance; a stainless steel device is designed in view of the deformation of a small beam caused by freezing and thawing cycle, so that deformation is reduced and convenience is provided for the fatigue testing after freezing and thawing; the method requires simple testing equipment, is convenient to operate and is convenient for testing and promotion.

Description

technical field [0001] The invention relates to a road engineering test method technology, in particular to a freeze-thaw cycle fatigue test method for asphalt mixture in permafrost regions. Background technique [0002] Fatigue of asphalt mixture refers to a damage phenomenon caused by the accumulation of unrecoverable strength attenuation of the material under repeated loads, and the fatigue resistance of asphalt mixture reflects its ability to withstand repeated loads without breaking. According to different loads, it can be divided into fatigue caused by repeated action of traffic load and temperature fatigue caused by temperature cycle. The former is due to the repeated action of traffic load, which makes the small deformation in the pavement structure accumulate. When this deformation continues to increase and expand The latter is due to the long-term exposure of the asphalt pavement in low-temperature areas to strong ultraviolet rays, strong winds, and large diurnal d...

AI Technical Summary

Problems solved by technology

[0004] Although the current asphalt mixture test regulations involve the freeze-thaw splitting test of asphalt mixture and the fatigue test of asphalt mixture, so far there is no performance test that can simultaneously consider the freeze-thaw and fatigue of asphalt mixture, let alone reflect the Performance Test of Repeated Freeze-thaw and Fatigue Load Repeated Interval Action

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