The constant improvement of road transportation facilities and the construction of roadways and railways have made our lives more suitable and fast. The construction of roads is indivisible from the road roller, so what kind of road roller is exemplary? There are many aspects to consider when using a roller for road construction. How can you evade bumps and cracks? How to make the roadbed more long-lasting?
In this blog post, we’ll discuss the various sizes of rollers and help you choose the one that best serves your needs!
What type of roller should be established for road construction?
The types of roads are distinct, and the types of road rollers used are also diverse. The following will introduce the road rollers needed for the construction of several standard other roads in detail.
(1) Asphalt concrete pavement: The road roller’s weight, amplitude, and vibration frequency should be established according to the paving thickness of the combination. Usually, a full-drive vibratory roller should be employed. A full-drive roller can be determined if the road surface is compacted and leveled. In places where the compaction capacity of the roller is not high, the roller with lower line tension and flexibility can be utilized.
To achieve the compaction effect as soon as practicable, a large-tonnage road roller can be established to shorten the construction period. In expansion, remark that if the thickness of the layer is less than 60mm, it is better to use a small vibratory roller of 2-6t with an amplitude of 0.35-0.60mm, to dodge the phenomenon of stacking, wave, and injury to the aggregate; At the same span, to prevent the asphalt mixture from being too cold, rolling should be carried out instantly after paving.
For dense layers greater than 100mm, large and medium-sized vibratory rollers with high amplitude (up to 1.0mm) and 6-10t should be employed.
(2) High-grade highways, such as 1st- and second-level national trunk roads and automobile-only roads: In addition to providing the stiffness, strength, and peace of the roadbed and pavement, the construction of such highways must also have adequate flatness, anti-skid, and anti-penetration effects.
The use of full-drive heavy-duty vibratory rollers for compaction can give a flat and solid road foundation; the use of tandem vibratory rollers to compact the road surface and the use of tire rollers for sealing can obtain a smooth and stable road structure; the use of tire rollers, the uniform compactness can be obtained, and the tire-type road roller will not destroy the initial viscosity of the soil during rolling so that each layer of dirt has adequate bonding performance. The front wheel can swing, so the compaction is more uniform; there will be no wrong compaction.
(3) A tire-driven tandem vibratory roller can be utilized for cement concrete pavement.
(4) For the bottom layer of the developed pavement subgrade, it is best to use a tire roller or a tire-driven vibratory roller for compaction to receive a uniform density.
(5) A static-action smooth roller can be used when restoring the road surface.
How can the road be paved sufficiently without bumps and cracks?
(1) Using a road roller, a road roller can aid in smoothing the surface of the driveway and making sure it is level. Select the right roller; if you prefer a too-small roller, it will not work perfectly. If you choose a too-large roller, it will be hard to maneuver and damage your driveway.
(2) Use a tamper. A tamper can assist compact the soil, ensuring no air pockets and creating a solid basis for your driveway.
(3) Evenly laying, when involving the driveway, it is necessary to spread it evenly; this will provide the strength and durability of the driveway.
By observing these tips, you can ensure your driveway will be paved satisfactorily with no bumps and cracks!
What are the elements that affect the compaction of the roadbed?
Influence of water content on the compaction phase of roadbed
The rolling work accomplished by the road roller needs to overcome the internal frictional resistance and cohesive force between soil particles before the soil particles can be substituted and close to each other. The internal frictional resistance and cohesive strength of soil gain with the increase of compaction. When the water content of the soil is short, the internal frictional resistance between the soil particles is significant.
After the compression arrives at a certain level, the compaction work of a road roller of a typical cargo can no longer overcome the resistance of the soil, and the dry bulk density will not advance; when the water content of the ground slowly increases When, water serves as a “lubricant” between soil particles, decreasing the internal frictional resistance of the soil.
It is not that the higher the water content, the more useful because when the water content of the earth continues to increase to or exceeds a specific limit, although the internal frictional resistance of the soil is still decreasing, the volume of water continues to grow, and water is incompressible. Accordingly, under the same compaction work, the dry bulk density of soil slowly decreases.
Impact of the thickness of the rolling layer on the compaction phase of the roadbed
The curves of compaction function and compaction development show that the optimal water content of the same soil drops with the increase of the procedure, while the maximum dry bulk density increases with the elevation of the function; under the state of the same water content, the higher the position, the higher the soil density. According to this law, the compaction function can be improved in the engineering course(the cargo is fixed, and the number of rolling passes is increased) to enhance the strength of the subgrade or reduce the optimal water content.
However, it must be pointed out that there is a precise limit to improving the resilience of soil basis by increasing the compaction function, and the impact will be slower when the part rises above a certain limit.
Effect of compaction machinery on subgrade compaction
Compaction machinery especially influences the compaction state of subgrade soil and pavement materials under a typical moisture content. Light-duty road rollers can only accept a small degree of compaction, while heavy-duty road rollers can receive a greater degree of compression. The real depth is also excellent.
According to the different soil quality, select separate rollers.
Light-duty and medium-duty smooth drum rollers can be utilized for pre-compression; ordinary medium-duty soft drum rollers are more appropriate for compacting low-cohesive soils and non-cohesive soils; heavy-duty, smooth drum rollers can compact viscous soils and vibration.
This kind of road roller is ideal for compacting low-viscous soil, gravel soil, gravel material, crushed stone mixture and different binder therapy grading vibratory rollers have a high compaction function and typically have a frequency modulation device, which can be adapted to different degrees of no vibration, weak vibration, and strong vibration according to requirements. Thus, it can be used as a light, medium, and heavy road roller. It has the benefits of lightweight, small volume, high speed, high efficiency, and flexible process.
