Method for determining aggregate proportion of sand grain type asphalt concrete
A technology for determining the method of asphalt concrete, applied in the direction of material weighing, specific gravity measurement, analyzing materials, etc., can solve the problem of not considering the difference of material sources, etc., and achieve the effect of simple realization means
Active Publication Date: 2020-11-20
NANJING FORESTRY UNIV
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Problems solved by technology
In the "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2004), only the gradation range of foreign sand-grain asphalt concrete is recommended. The aggregate ratio is determined by adjusting the aggregate ratio so that the synthetic gradation is within the specified range. The gradation range in this method is an empirical value, and it does not consider the difference in the source of the material, let alone the actual aggregate. Under the premise of material characteristics, the designed gradation can achieve an embedded compact structure with excellent performance.
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[0051] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:
[0052] The two grades of aggregates used in this embodiment are basalt 1# (particle size range 3-5mm) and basalt 2# (particle size range 0-3mm).
[0053] Step 1. Put the basalt 1# aggregate and basalt 2# aggregate in an oven with a temperature of 105°C±5°C and dry them to constant weight, then take them out and cool them for later use;
[0054] Step 2. Weigh the mass of the 3L capacity cylinder as M 1 =780, fill the 3L capacity cylinder with water, and wipe off the water on the outer wall of the cylinder, weigh the mass of the capacity cylinder and water as M 2 =3789, the density of water is used to calibrate the inner volume of the cylinder according to the following formula:
[0055]
[0056] In the formula: M 1 is the net mass of the 3L capacity cylinder, g;
[0057] m 2 is the mass sum of the capacity cylinder and the water in the cylinder a...
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Abstract
The invention discloses a method for determining the aggregate proportion of sand grain type asphalt concrete, which belongs to the technical field of road engineering. The method specifically comprises the following steps of measuring the tap density of the sand grain type asphalt concrete aggregate by using a 3L capacity cylinder, blending and mixing the aggregates in different proportions, andmeasuring the combined density rhoZ of the mixed aggregates after mixing, calculating to obtain the synthetic density rhoH under the proportion according to the proportion of the aggregate and the tapdensity of the aggregate, according to the ratio of the combined density rhoZ to the synthetic density rhoH under a certain proportion condition, calculating to obtain a built-in coefficient ID underthe proportion condition, drawing a relation curve between the built-in coefficient and the aggregate proportion, and taking the proportion corresponding to the maximum built-in coefficient in the curve as the aggregate proportion on the sand grain type asphalt concrete. According to the method, the material source characteristics of the aggregate are considered, the determined aggregate proportion of the sand grain type asphalt concrete can form a good embedded and extruded compact structure, and a reliable method is provided for designing the sand grain type asphalt concrete with excellentpavement performance.
Description
technical field [0001] The invention belongs to the technical field of road engineering, and relates to a method for determining the aggregate ratio of sand grain type asphalt concrete. Background technique [0002] The nominal maximum particle size of sand-grained asphalt concrete is less than 10mm. It is mainly used in the preventive maintenance of high-grade asphalt or cement pavement and the corrective maintenance of minor diseases. It can also be used as the wear layer of new pavement. In addition to the advantages of ordinary ultra-thin asphalt concrete, sand-grain asphalt concrete can also significantly reduce the thickness of the surface layer, especially suitable for projects with strict restrictions on elevation and structural weight. Sand-grain ultra-thin asphalt concrete also has the advantages of super long durability, good skid resistance, noise reduction, water mist and road water film, and good anti-rutting and anti-wear performance. [0003] Sand-grain asph...
Claims
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IPC IPC(8): G01N9/36G01N5/00
CPCG01N9/36G01N5/00Y02W30/91
Inventor 不公告发明人
Owner NANJING FORESTRY UNIV