A crack dissipative layer of micro-asphalt gravel based on vibration forming and its forming method

Abstract

The invention belongs to the technical field of road engineering, and discloses a micro asphalt macadam crack dissipation layer based on vibrating compaction and a compaction method thereof. The micro asphalt macadam crack dissipation layer based on vibrating compaction is characterized by comprising the following raw materials: limestone as mineral aggregate of the micro asphalt macadam crack dissipation layer, and asphalt as a binder for the micro asphalt macadam crack dissipation layer, wherein the asphalt-aggregate ratio is 1.4-2.6%; the mineral aggregate gradation of the micro asphalt macadam crack dissipation layer is as follows: the aggregate of which the particle size is smaller than 26.5mm accounts for 100% of total mass of the graded aggregate; the aggregate of which the particle size is smaller than 16mm accounts for 75-95% of total mass of the graded aggregate; the aggregate of which the particle size is smaller than 9.5mm accounts for 48-64% of total mass of the graded aggregate; the aggregate of which the particle size is smaller than 4.75mm accounts for 30-38% of total mass of the graded aggregate; the aggregate of which the particle size is smaller than 2.36mm accounts for 14-24% of total mass of the graded aggregate; the aggregate of which the particle size is smaller than 0.6mm accounts for 5-15% of total mass of the graded aggregate; and the aggregate of which the particle size is smaller than 0.075mm accounts for 0-5% of total mass of the graded aggregate.

Description

technical field [0001] The invention belongs to the technical field of road engineering, in particular to a micro-asphalt gravel crack dissipating layer based on vibration forming and a forming method thereof. Background technique [0002] During the continuous and rapid development of highway construction in our country, semi-rigid base asphalt pavement is widely used as a main pavement structure. According to incomplete statistics, more than 90% of my country's current high-grade highways use semi-rigid bases. However, there are many problems in semi-rigid base pavement when it is widely used. Cracks are the main form of semi-rigid structure pavement disease. Surveys show that a large number of cracks will appear in the vast majority of highways in my country within one or two years after opening to traffic. On-site core sampling of semi-rigid base asphalt pavement shows that among many factors that cause cracks in semi-rigid base asphalt pavement, reflection cracks in s...

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Problems solved by technology

Through engineering practice, it is found that the above measures have achieved a certain anti-cracking effect, but various anti-cracking measures have their own limitations: ① Increase the thickness of the asphalt surface layer, and the surface layer is more likely to produce ruts when the temperature is high in summer, and it will inevitably increase the project budget. ;②It is difficult to control the construction time of the pre-cut seam at the base. If the sawing is too early, the strength of the slot will be destroyed by the sawing machine due to insufficient strength, resulting in irregular breakage; if the sawing is too late, the base will crack under the early temperature change It has already been formed; ③ Adding geotextile or grid, due to poor drainage, short-term crack prevention effect, and poor suppression effect on larger cracks, it cannot be regarded as an ideal interlayer material

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