Test detection method for equivalent compaction function of asphalt mixture and application

Abstract

The invention relates to a test detection method for the equivalent compaction function of an asphalt mixture and an application, and belongs to the technical field of road engineering. The method includes the steps that the asphalt mixture is subjected to a mixture proportion design test, the optimal asphalt amount is determined, and the gross volume relative density is calculated; a trial road section is paved, the number of grinding times of a site compaction machine generated when grinding is carried out till density is not increased any more is recorded, and a core sample is taken in site to measure the gross volume relative density; the compaction degree is calculated, and according to the gross volume density and the compaction degree of the obtained sample, by adjusting the number of the compaction times and the compaction temperature, the maximum number of the compaction times and the lowest compaction temperature are finally determined to correct the method of a standard indoor Marshall test; a Marshall correction test piece is prepared, and the compaction degree of a construction site is measured with the gross volume relative density of the Marshall correction test piece as the standard. According to the test detection method, the actual compaction degree of the construction site can be more accurately measured; meanwhile, the lowest compaction temperature of the mixture is determined, the mixing temperature and the paving temperature are reasonably reduced, the construction speed is increased, and energy is saved.

Description

Technical field [0001] The invention relates to an equivalent compaction work test detection method and application of an asphalt mixture, and belongs to the technical field of road engineering. Background technique [0002] Asphalt pavement is the main structural form of high-grade highways in my country. With the development of the national economy, the rapid increase in traffic volume, coupled with the large-scale vehicle, serious overload, and channelized traffic, make the early damage of asphalt pavement serious. A large number of studies have shown that : The early damage of asphalt pavement in my country is directly related to the degree of compaction of the road surface. The road surface with insufficient degree of compaction is prone to rutting, water seepage, fatigue and other diseases; while overpressure will cause the road surface to appear oily and instability. [0003] The Marshall test provides many important design parameters for road construction. The current Marsh...

AI Technical Summary

Problems solved by technology

With the improvement of the level of construction technology and compaction machinery (vibratory rollers are generally 10-14t, rubber-tyred rollers 25t-30t), practice has proved that the compaction work of these compaction machinery increases, making the final density of asphalt mixture on the road Exceeded the standard Marshall method established at the beginning, so the asphalt mixture test method (Marshall test method) used in the current specification cannot simulate the compaction effect on site, resulting in the design parameters obtained according to the test method of equivalent compaction work. The significance of construction is not great, that is, the compaction work on site does not match the compaction work of indoor Marshall. When the Marshall density is used to control the on-site compaction degree, most of the compaction degrees are over 100, and the actual on-site compaction degree cannot be obtained.

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