Pavement Rehabilitation Progarm Concrete Construction Program
Along with the Pavement Rehabilitation Program, The City of Calgary also has a number of other paving programs that occur during construction season. These programs are designed to extend the life and maintain the performance quality of our roadways.
Full road reconstruction
Full road reconstruction consists of removing an existing road and replacing it with a new road.
- As the most costly road rehabilitation method, full reconstruction is generally not the preferred option. However, if a road has extensive deterioration, alternative strategies such as surface overlay or spray patching may not be effective and constant repair is often more costly in the long run.
- Full reconstruction allows the City to revise and select the appropriate pavement type necessary based on traffic use and the specific needs of a road.
- Fully reconstructed roads last up to 20 years.
Full reconstruction contracts are publicly tendered and awarded to pre-qualified contractors.
- First, the asphalt and gravel on the existing road is excavated and removed to a disposal site.
- Then, the sub base is evaluated and repaired as required. Next, the road is reconstructed to design road specifications for road classification.
- When paving is complete, lane markings are applied and the road is opened for traffic.
The following four types of roads would require full reconstruction:
Micro surfacing is the application of a special coating to the top layer of asphalt that prevents oxidization and moisture penetration. It is a cost effective preservation treatment to slow down the natural degradation of the road and preserve service life without a costly and disruptive reconstruction.
For more information on The City’s micro surfacing program, visit Calgary.ca/microsurfacing
Backfill densification corrects settlements in the roadway by creating a solid foundation under the pavement by injecting a cement material into it. Done as a part of The City of Calgary's efforts to ensure safe and smooth roadways, the settled roadway is stabilized by coring strategically placed injection holes along the section of the roadway. Backfill densification is part of the mudjacking contract, it is publicly tendered and awarded to a pre-qualified contractor.
Upon completion, core holes are filled with high strength, rapid set grout. The roadway is rolled over and finished to match the existing structure. The benefits of backfill densification include:
- No excavation is required.
- The surrounding landscaping is left undisturbed.
- Further settlement of the soil is prevented.
- Slows or stops the deterioration of pavement.
- More aesthetically appealing than patches.
- Quick repair, minimal inconvenience to vehicular traffic.
Crack sealing is a rehabilitation method used to keep excess water or moisture from penetrating asphalt and to prevent further cracking and deterioration of city streets.
- Completed on roads that are least three years old, crack sealing prolongs the lifespan of the asphalt by creating permanent seals.
- It is a cost effective method that requires a relatively small crew. It can be done very quickly and roads can be driven on shortly after sealing is completed, keeping traffic disruptions and closures to a minimum.
The following road shows the process of crack sealing from identification to completion:
Spray patching is a quick, efficient, and cost effective way to patch cracked and damaged pavement. An emulsified mixture of asphalt and gravel seals the damaged areas and rejuvenates the pavement. The benefits include:
- Several types of road defects can be repaired quickly, including large cracks, potholes, localized ravelling, localized alligator cracking, and gaps at the lip of gutters.
- Spray patching is a quick process that takes approximately 15 minutes to cure. You can safely drive over the area immediately after it has been patched.
- Spray patching is about half the cost of conventional paving, enabling tax dollars to be invested into other initiatives aimed at improving our roads.
- Most neighbourhoods and roads can be spray patched without any road closures.
Here is an example of spray patching:
Road pavement repair programs FAQ
Various paving activities begin in June and finish in October, weather dependent. Typically concrete work in preparation for paving will begin in May, weather permitting. During construction season, City crews typically work two shifts, seven days a week to take full advantage of the short construction season. The paving program is also partially completed by private contracted services
For more information on paving, visit calgary.ca/paving
Affected residences and businesses receive notice from The City in early spring notifying them that their road is scheduled for road work. Closer to the time when work is to begin on your road, paving signs advising of the work will be placed in your area.
While some roads might seem worse than others, roads selected for paving resurfacing are based on specific guidelines for road conditions and focuses on those that require the most urgent repairs. The following are the considerations that the assessment is based on:
- Pavement Management System – this survey system is used by all cities in Alberta. The system measures the defects in the surface area on each city street. The City can then determine the condition of each street, the deterioration rates, and the most economical times for resurfacing.
- The Pavement Quality Index (PQI) rating of the road – The City of Calgary, Roads has an evaluation/rating system that generates a PQI from one to 10 with 10 being perfect. The target is to keep the overall City network PQI rating greater than or equal to 7.0. Roads that are evaluated below this target are put on a list for future resurfacing. Surface rehabilitation methods range from crack sealing, micro surfacing, overlay to reconstruction or combinations of these. Roads are considered for overlay when the PQI falls below:
Majors - 6.0, inspected every second year.
- Collectors & Industrials – 5.0, inspected every second year.
- Locals – 4.0, inspected every sixth year.
- Annual Visual and Automated Condition Survey – City field staff also use visual and automated systems to survey the condition of every street in the city.
- Utility Replacement Programs – Following identification of a potential resurfacing, Roads coordinate with other City Business units (i.e. Water Services, Transportation Infrastructure) and utility providers (Enmax, Shaw) to determine if any of the selected streets will be excavated in the near future for infrastructure update or replacement of a utility line or pipe. Those streets that will likely be excavated are not resurfaced until the utility work is complete. On occasion, resurfacing can be cancelled due to last minute discovery of utility problems.
- Budget – Once a road qualifies for rehabilitation, it is assigned a priority rating and budget is made available to begin work.
Resurfacing is funded by the City's overall tax mill rate and does not result in any additional taxes on your property. This repaving process will improve your street and extend its life. Not repaving the street now would cause to it deteriorate and require reconstruction, which has a higher cost and a longer timeline than resurfacing.