Driveway pavement is an activity that many Americans engage in because of the benefits that paved surfaces present. Structural design is usually a very important part of the paving process. Any paved surface needs to have sufficient structural capacity to support the in-service loads involved in everyday use. The traffic loads and subgrade conditions are usually very important considerations when determining the thickness of the pavement. When in search of companies that do driveway paving in Markham, here are a few factors to consider.
The process of laying pavement should start with the proper preparation of the subgrade. This is important because the subgrade forms the foundation of the pavement. The preparation must ensure that the subgrade is free of vegetation and topsoil. The subgrade should also be shaped so that it matches with the final contour that one expects to achieve. When the subgrade is shaped according to the final contour that one intends to achieve, finishing is made easier.
The subgrade needs to be compacted adequately to eliminate any soft spots. In case there are any soft spots present, they should be removed and replaced with properly compacted soil. The presence of soft soil is usually discouraged because it causes structural problems in the pavement eventually.
An aggregate base layer of 6-8 inches is usually suitable for typical residential driveways. The base layer should be made of compacted crushed aggregate. After the aggregate layer, two inches of dense-graded HMA and 1.5 inches of HMA surface should follow. When asphalt is applied finally on the top, it should be compacted adequately using appropriate equipment. A loose layer of 4 inches in thickness can usually be compacted to produce 3 inches of thickness.
HMA layers can also be varied in thickness depending on the purpose of the pavement. If the pavement is being laid on a parking lot of high traffic, then the thickness of the HMA layers should be higher. Thicker HMA layers usually result in thicker pavements in overall.
Another very important aspect of constructing pavements is drainage. Drainage is a very important aspect of the construction process and often affects the performance of the surface a lot. Water needs to be drained adequately from the surface to prevent it from entering the subgrade. In case water enters the subgrade, it becomes harder to evaporate or drain. As such, even if the weather outside is hot, the subgrade may remain wet and damp indefinitely.
To prevent this ordeal, the subgrade needs to be shaped and sloped properly so that it can allow proper drainage to occur. Areas that have sod need to be graded so that they drain water away from the pavement. The slope of the pavement should be in such a way that it slopes a quarter an inch per linear foot.
HMA mix types come in a wide range, making it important to consider properly before choosing. Most mixes are generally acceptable for parking lots and driveways. As a client, it is important to ensure that the contractor one hires buys the HMA from a producer that has a good reputation in the industry. Asking to see sample completed projects before choosing is advisable.