JPS6221921B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an asphalt road paving method for reliably and effectively constructing a strong asphalt paved road. This invention uses hard asphalt with a penetration of about 40° to 20°, and adds single-grain size No. 4 crushed stone as the main aggregate heated to a temperature of 200°C to 220°C with a grain size of about 30mm to 20mm. , coarse sand with a grain size of 2.2 mm or less as fine aggregate heated to a temperature of 200°C to 220°C and stone powder as a filler are mixed to make a main composite material,
The main composite material is heated to a relatively high temperature of approximately 180°C to 200°C to form a mastic composite material, and the mastic composite material is spread at the construction site to a thickness of approximately 50 mm using an asphalt finisher. After leveling, the protrusions of the main aggregate are lightly pressed with a steel wheel roller and pressed in. At that time, the main aggregate has a large particle size and the fine aggregate has a small particle size, and the mixture at the time of leveling. A mixture of asphalt, crushed stone, sand, and stone powder with a penetration depth of 80° to 100° is applied to the surface, which has become rough due to the separation phenomenon, to approximately 10 mm or more.
Cover it to a thickness of 15 mm, fill the gaps between the main aggregates at a low temperature of about 120°C, cover it to form a covering layer, and complete the top and bottom as one piece by thoroughly compacting it. When implementing the method, the composition of the main material mixture is

【table】 In addition, the composition of the surface filler coating layer is

【table】 Or, the composition of the main material mixture is

【table】 In addition, the composition of the surface filling coating layer is

[Table] The purpose is to ensure the effective construction of asphalt paved roads with sufficient strength. Therefore, the composite material of the covering layer depends on the size of the aggregate,
By changing the type, blending ratio, additives, etc., the finished surface can be finished with a thin layer of about 10 mm to 15 mm thick. Generally, on asphalt-paved roads, the problem is how to make tracked vehicles such as bulldozers or extremely heavy large vehicles run comfortably. The asphalt pavement method is generally achieved by combining and bonding asphalt as a binding material with aggregate such as crushed stone or sand, so it is necessary to add additives or fillers to asphalt as a binding material. The aim is to maximize the bonding force by mixing the materials, and to combine them to maximize the strength of the aggregate, so that such mixed materials can be easily constructed on-site. That is, as a binder, as mentioned above, it is possible to mix in rubber or resin as an additive, and also to mix in a large amount of stone powder, slaked lime, cement, etc. as a filler to make it physically viscous. It is also conceivable to increase the elasticity and use a mastic composite material. Furthermore, in order to maximize the strength of the aggregate, single-grained aggregates with large grain sizes of the same size are used to increase the internal friction caused by the interlocking of the crushed stones. , to take advantage of the elasticity of crushed stone. The amount of sand used as fine aggregate should be considered to fill the voids created by the interlocking of crushed stones. Since the voids are assumed to be about 25%, the amount of sand should be about 25%, and coarse sand is used in consideration of internal friction. As for the mixed material, it is possible that it will be deformed due to the tire pressure of car traffic during high temperatures in summer, and that it will be damaged by press-in of tracked vehicles such as bulldozers, so as a countermeasure, use asphalt as hard as possible (20~
40). Therefore, hard asphalt with a penetration degree of 20° to 40° needs to be heated to a high temperature for its workability when considering the leveling of the mixed material on site. High-temperature materials are mixed by air and heat,
There is a risk that it will become brittle due to oxidation, so a large amount of filler (stone powder) is added to make it into a mastic compound.
Prevents oxidation. (The appropriate amount of stone powder is around 17%; if it exceeds that, problems will arise in workability.) Mastic composite material is also effective against wear of tires, chains, and spiked tires during cold and snowy winters. It is. Therefore, the temperature of the composite material is 180℃~200℃ as a standard.
shall be. The composition of the main material mixture, aggregate sieving particle size, and composite particle size are as follows.

【table】

【table】

【table】

[Table] The above-mentioned high-temperature mixture of 180℃ to 200℃ is transported to the construction site, leveled with an asphalt finisher, and the protrusions of the main aggregate are lightly pressed in with an iron wheel roller. As a result, the surface becomes uneven and rough, which fills the gaps between the main aggregates. In addition, a thin coating layer is laid down to make it suitable for unsuitable vehicle driving. This filling coating layer has a thickness of 10 mm to 15 mm, and the size, type and blending ratio of the aggregate of the mixed material, additives, etc.
Select according to the needs of the route. That is, in setting the thin coating layer, anti-slip pavement, colored pavement, rubber-containing pavement, resinized asphalt pavement,
This means that road paving methods such as light-colored asphalt pavement can be constructed. The penetration degree of the asphalt used for this filling coating layer may be 80° to 100°, and the temperature of the composite material is lower than that of the main composite material, and is set at a low temperature of about 120°C. The main composite material is at a high temperature, and if you spread the low-temperature filling and coating composite material on top of it, it can be compressed immediately without adhering to the iron wheel roller, and the upper and lower parts are integrated and fully compressed. It can be hardened with good results. Next, examples of mixed materials for the filling coating layer will be shown below.

【table】

[Table] In this way, according to the present invention, it is possible to reliably and effectively construct an asphalt paved road with sufficient strength, which is extremely useful.

[Brief explanation of the drawing]

Figures 1 and 2 show the construction order of this invention,
In the figure, 1 is the main aggregate, 2 is mastic mortar, and 3
4 indicates the main body portion, and 4 indicates the filling coating layer.

Claims (1)

[Claims] 1 Hard asphalt with a penetration of about 40° to 20° is used, and to this is single-grain size No. 4 crushed stone with a grain size of about 30 mm to 20 mm as the main aggregate heated to a temperature of 200 ° C to 220 ° C, and 200 ° C. Coarse sand with a grain size of 2.5 mm or less as a fine aggregate heated to a temperature of ℃ to 220℃ is mixed with stone powder as a filler to make a main composite material, and the temperature of the main composite material is adjusted to about 180℃. The mastic mixture is heated to a relatively high temperature of ~200°C to form a mastic composite material, and the mastic composite material is leveled at the construction site to a thickness of approximately 50 mm using an asphalt finisher, and the protrusions of the main aggregate are removed. Press it lightly with a steel roller to press it in, and at that time,
The main aggregate has a large particle size and the fine aggregate has a small particle size, and the surface has become rough due to the separation of the mixture during leveling. A mixture of asphalt, crushed stone, sand, and stone powder is coated to a thickness of approximately 10 mm to 15 mm, and this is applied at a low temperature of about 120°C to fill the gaps between the main aggregates and cover to form a covering layer. , an asphalt road paving method characterized by thorough compaction and finishing the upper and lower parts as one piece.