Testing method of conventional performance index of asphalt under corrosion of melting snow salt

Abstract

The invention discloses a testing method of a conventional performance index of asphalt under corrosion of melting snow salt. The testing method is realized by the following technical scheme of: carrying out sample preparation on the asphalt of a freezing and thawing test; carrying out a salt freezing circulating test on the asphalt; carrying out the sample preparation on the asphalt subjected to salt freezing circulation before a conventional performance test is carried out; carrying out needle penetration, softening point and ductility tests on the asphalt; testing the adhesiveness of the asphalt and aggregate; carrying out performance comparison on an experimental result and a standard index; selecting the highway building material asphalt which is applicable to being used in a high and cold region, wherein the asphalt with the adhesiveness grade which is lower than grade 4 needs to be seriously adopted. The testing method disclosed by the invention can effectively test the change condition of a basic performance index of the asphalt after the salt freezing circulation, and the freezing and thawing test is set according to the temperature difference of the region, as well as the type and a conventional dosage of the melting snow salt. According to the method disclosed by the invention, the highway building material asphalt which is applicable to being used in the high and cold region can be effectively selected and scientific evidences for quality detection and asphalt performance assessment of an asphalt road surface material product of the high and cold region are provided.

Description

technical field [0001] The invention relates to a test method for conventional performance indexes of asphalt, in particular to a test method for indexes such as softening point, penetration and ductility of base asphalt or modified asphalt used in road engineering after freezing and thawing cycles under the corrosion of snow-melting salt solution, which belongs to material properties test field. Background technique [0002] As an important road engineering material, asphalt can bond mineral aggregates into a whole, enhance the strength of the road surface, resist driving damage, and make the road surface resistant to water damage. Therefore, asphalt is an important road building material in highways and other roads at all levels. have been widely applied. [0003] In the alpine region, in order to ensure the safe driving of road vehicles, the ice and snow on the road surface must be removed in time. The methods of deicing and deicing that are generally adopted at prese...

AI Technical Summary

Problems solved by technology

This method has the following problems: (1) Only one freeze-thaw cycle is considered; (2) The freeze-thaw temperature is -20°C±2°C, which does not consider the extreme low temperature that may occur in alpine regions; (3) The influence of deicing agent is not considered ; (4) Did not pay attention to the salt freeze damage of asphalt material itself

Therefore, there is no specific relevant test procedure reference for the salt freezing test of asphalt, how to prepare the asphalt specimen, which properties of the asphalt will be affected by the deicing agent, whether the composition of the asphalt will change before and after the deicing agent is affected, whether the base asphalt and the modified asphalt are affected A series of problems such as the difference in the degree of deicing agent influence have yet to be resolved

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