How to choose a road roller for the compaction of the road base?

How to choose a road roller for compaction of cement stabilized soil base

Cement stabilized soil refers to a mixture with a certain compressive strength obtained by adding a certain amount of cement and water to the loose crushed soil after mixing, compacting, and curing. For road bases paved with cement stabilized soil, the following matters should be paid attention to when rolling:

  • When the mixture is roughly leveled on the road section, it should be quickly rolled with a tire roller or tractor or grader and leveled.
  • After the base layer is reshaped, use a three-wheel smooth roller or a heavy-duty tire roller, or a vibratory roller with a size of more than 12t to roll it within the basic width. In the straight section, it should be rolled from the shoulders on both sides to the road center; in the curved section, it should be rolled from the inner shoulder to the outer shoulder. When rolling, the overlapping width is 12 times the width of the rear wheel, and the edge and shoulder of the stable layer should be pressed 2~3 times more. When the water content is greater than 2%, it should be rolled more than 6 times. The rolling speed of the first two times is 1.5~1.7km/h, and the following times are 2~2.5km/h. During the rolling process, it is not allowed to “turn around” or make emergency braking on the road section that has been completed or is being rolled, so as not to damage the surface of the base layer.
  • During the rolling process, the phenomenon of “spring”, looseness, and peeling can be prevented, and a small amount of water can be added when drying.
  • In the later stage of rolling, excessive stress or long rolling time should be avoided to prevent the strength of cement stabilized soil from being reduced. A smooth roller should be used in the final “final pressing” to improve the flatness of the base surface.
  • It is best to use a tire roller for rolling, the machine weight is 10~20t, the tire pressure is about 0.7MPa, and the number of wheels is between 7~11.
  • When the stabilized soil is laid on the soft roadbed, it is best to use a vibratory roller with medium and low line pressure. When the compaction density increases, the paving becomes hard and the roller bounces slightly, the amplitude should be reduced to damage the machine parts.

How to choose a road roller for compaction of lime stabilized soil base

Lime stabilized soil refers to a mixture with a certain compressive strength obtained by mixing, compacting and curing by adding an appropriate amount of lime and water to the loose crushed soil. For the road base or subbase with lime stabilized soil as auxiliary material, the following matters should be paid attention to when rolling:

  • Before rolling, check the water content of the mixture. The rolling effect is the best when the water content is 1%~2%. When the water content is insufficient, it should be supplemented with water, and when the water content is too large, it should be turned over to the sun.
  • After manual paving and shaping, first use a tractor, a 6-8t tandem roller, or a tire roller to roll 1~2 times; then use a static smooth roller over 12t for rolling until the mixture is dense until the degree reaches 95%~98%.
  • If lime stabilized soil is used as the subbase of advanced pavement, the content of water and lime should be precise. When rolling, heavy-duty static rollers cannot be used for multiple rolling, but high-efficiency vibratory rollers should be used. First, the vibration source is disconnected for static pressure, and then the vibration compaction is performed gradually, and finally, the vibration source is disconnected for static compaction.

How to choose a road roller for the compaction of lime-stabilized industrial waste slag base

Lime-stabilized industrial waste refers to the mixture obtained by mixing a certain amount of lime, fly ash (or cinder) with other aggregates (or no other aggregates), adding an appropriate amount of water, and mixing, compacting, and curing. material. Since the density of the mixture has a great influence on the strength, it is advisable to use a heavier road roller for rolling during compaction. Usually, the medium-sized road roller is used for initial pressing 3-4 times, and then the heavy-duty road roller is used to continue rolling 6-8 times until the required compactness is reached.

How to choose a road roller for compaction of graded aggregate base

Graded aggregate refers to a mixture of crushed stone or gravel or crushed gravel according to particle size. For the base layer paved with this mixture, it is best to use a vibratory roller for compaction, a static smooth roller over 12t, a heavy-duty tire roller, or a vibratory roller and a tire roller to roll together.

How to choose a road roller for the compaction of the crushed stone base

Interstitial gravel base refers to the road base formed by layered paving and layered rolling of large, medium and small single size gravel of different specifications. This kind of base layer should be divided into two steps when laying: first laying large gravel and compacting; then laying small gravel and finally compacting. For the first compaction, an 8-10t static tandem roller or a 5t vibratory roller should be used for rapid rolling to vibrate all the interstitial materials into the pores of the coarse gravel. After paving the small gravel for the second time, continue to roll it with a vibratory roller. After the pores on the surface of the crushed stone are all filled, use a 12-15t static smooth roller for 1-2 times of final pressure until the surface is smooth and stable, with no obvious wheel marks and no stone creeping phenomenon.

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5 Comments

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