Subgrade preparation steps for new pavements

Subgrade preparation

Is your pavement old and damaged? Are you planning to build a new pavement? Building a pavement is a comprehensive process that has various stages to it. One such important stage is the subgrade preparation. A subgrade is the foundation of a pavement structure. There is a complete process of subgrade preparation to make sturdy pavement. This process differs for commercial paving contractors and residential paving contractors as the residential pavement is more about the aesthetic appeal and commercial pavements need more strength. Let us have a look at both the processes.

Step for Residential Subgrade Preparation

  1. To begin with the subgrade preparation, the pavement land is evaluated to identify structural problems.
  2. On identification of structural problems, the old asphalt layer is moved to replace the subgrade’s soft spot with rock and aggregate.
  3. The bad soil is replaced with a mix of rocks and graded stone in a layer of 12 inches.
  4. Next, the subgrade is leveled in order to provide proper drainage to the pavement. If this step is missed, water pools will form on your new pavement.
  5. After the leveling is done, the old asphalt is surfaced, and the sides of the pavement are cleared of any obstructions.
  6. Compaction is added to the subgrade by applying pressure on it. This is mostly done by work trucks passing on the pavement.
  7. Once the subgrade is stabilized and compacted, the paving process is initiated.

Steps for Commercial Subgrade Preparation

  1. To prepare the subgrade of a commercial pavement, the subgrade’s soft spot is removed and instead uniformly-sized rocks are put after placing a cloth layer to strengthen the subgrade.
  2. When the subgrade is prepared, the soil is also evaluated. This is essential to ensure that the built of the pavement is strong for commercial use.
  3. Different areas will have different soil types. Hiring professional pavement contractors ensures that the proper soil type is identified for a sturdy pavement construction.

Once the soil type and soil condition are identified, it is treated before the final asphalt installation is poured to set.

Preparing a strong subgrade for your pavement is essential if you want to increase the life of your pavement. With a good subgrade, your pavement will not face issues of waterlogging and potholes. So make sure you follow the right steps in preparing a solid subgrade foundation for your pavement.