Pavement Failure in Surrey: Common Causes and When to Get an Assessment
Cracks, potholes, rutting and uneven pavement are common problems on roads, parking lots, driveways and other paved surfaces. While some surface deterioration is caused by age and traffic, pavement problems can also be related to the conditions beneath the pavement.
For property owners, developers and contractors searching for pavement assessment and design in Surrey, understanding why pavement fails is an important first step toward choosing an appropriate solution.
A pavement assessment can help determine the condition of an existing pavement structure and identify factors that may be contributing to its deterioration. For new construction, pavement design can use information about the subgrade, expected traffic and project requirements to develop an appropriate pavement structure.
What Causes Pavement Failure?
Pavement performance depends on more than the asphalt or concrete visible at the surface.
The overall pavement structure can be affected by:
- Subgrade soil conditions
- Drainage
- Groundwater
- Traffic loading
- Pavement thickness
- Construction quality
- Material properties
- Seasonal weather
- Age and maintenance
When one or more of these factors are not adequately addressed, pavement deterioration can occur.
Common Signs That a Pavement Needs Assessment
Not every crack means a pavement has reached the end of its useful life. However, recurring or worsening damage can indicate that a more detailed assessment is appropriate.
1. Potholes
Potholes can develop when water enters pavement cracks or weak areas and contributes to deterioration of the pavement structure.
Repeated pothole formation may indicate that simply filling the surface is not addressing the underlying problem.
2. Alligator Cracking
Alligator or fatigue cracking appears as interconnected cracks that can resemble the pattern of an alligator’s skin.
This type of cracking can be associated with repeated traffic loading and inadequate structural support.
3. Rutting
Rutting refers to longitudinal depressions that develop in the wheel paths.
It can result from deformation within the pavement layers or supporting materials.
4. Uneven or Depressed Areas
Low areas may develop because of settlement, inadequate compaction, drainage issues or other ground-related conditions.
If the underlying material continues to move, surface repairs may not provide a long-term solution.
5. Edge Cracking
Cracking along pavement edges can be associated with drainage, shoulder conditions, traffic or inadequate edge support.
The cause needs to be assessed rather than assumed.
Why the Subgrade Matters
The pavement structure transfers traffic loads into the material beneath it.
This underlying material, commonly referred to as the subgrade, therefore plays an important role in pavement performance.
If the subgrade is weak, variable or poorly prepared, the pavement may experience deformation or other forms of distress even when the surface materials appear appropriate.
A geotechnical investigation can provide information about the soil conditions relevant to pavement design.
How Drainage Affects Pavement Performance
Water is an important consideration in pavement engineering.
Poor drainage can contribute to deterioration by allowing water to accumulate within or beneath pavement layers.
Depending on the site, drainage considerations may include:
- Surface water
- Groundwater
- Site grading
- Drainage paths
- Subsurface drainage
- Seasonal moisture changes
The appropriate drainage solution depends on the site’s conditions and project requirements.
When Should an Existing Pavement Be Assessed?
A pavement assessment may be useful when a property owner or project team needs to understand why pavement is deteriorating or determine whether rehabilitation is appropriate.
Consider an assessment when:
- Cracks continue to spread
- Potholes repeatedly return
- Rutting is becoming more pronounced
- Large areas are settling
- A parking lot is deteriorating faster than expected
- A road is showing widespread distress
- A pavement rehabilitation project is being considered
- A property is being redeveloped
- A new pavement structure is being planned
The appropriate assessment depends on the type, age and condition of the pavement.
What Happens During a Pavement Assessment?
The assessment process depends on the project, but a geotechnical or pavement engineer may consider several sources of information.
Visual Site Assessment
The existing pavement is inspected for visible signs of distress.
The engineer may document:
- Cracking
- Rutting
- Potholes
- Settlement
- Drainage conditions
- Surface deformation
- Other pavement defects
Review of Existing Information
Available drawings, previous reports, maintenance records and information about pavement construction may be reviewed where available.
Subgrade Investigation
Where appropriate, the underlying soil and pavement structure may be investigated to understand the materials supporting the pavement.
Traffic Considerations
The expected traffic loading is an important consideration for pavement design.
A driveway serving occasional passenger vehicles has different requirements from a commercial parking lot exposed to frequent heavy vehicles.
Engineering Analysis
The information collected during the assessment is evaluated to identify likely causes of deterioration and determine appropriate recommendations.
Pavement Assessment vs. Pavement Design
These two services are related but have different purposes.
Pavement Assessment
An assessment focuses on an existing pavement.
The objective may be to understand its condition, identify potential causes of distress and determine appropriate repair, rehabilitation or replacement options.
Pavement Design
Pavement design focuses on a new or reconstructed pavement.
The engineer considers factors such as:
- Subgrade conditions
- Expected traffic
- Drainage
- Pavement materials
- Design requirements
- Site conditions
The goal is to develop a pavement structure appropriate for the project.
Pavement Design for New Construction in Surrey
For a new road, parking lot or other paved area, pavement design should consider the conditions below and the loads the pavement is expected to carry.
Important factors can include:
Subgrade Strength
The supporting soil can influence the required pavement structure.
Traffic Loading
The expected type and volume of traffic can affect pavement requirements.
Drainage
Water-management considerations can be important for long-term pavement performance.
Material Selection
Pavement layers need to be selected according to project requirements and engineering recommendations.
Site Conditions
Topography, groundwater and existing ground conditions may affect pavement planning.
Parking Lot Pavement Assessment in Surrey
Commercial parking lots experience repeated vehicle loading and exposure to weather.
A pavement assessment can be useful when owners notice:
- Widespread cracking
- Potholes
- Rutting
- Drainage problems
- Settlement
- Repeated repair requirements
For larger parking areas, assessing the pavement structure and supporting subgrade can provide useful information before major rehabilitation work is undertaken.
Pavement Assessment for Roads and Driveways
Residential driveways, private roads, commercial access roads and larger roadways can all experience pavement deterioration.
However, the causes and engineering requirements may be very different.
For example, a driveway may primarily experience passenger-vehicle traffic, while a commercial access road may experience heavier and more frequent loading.
Pavement recommendations should therefore be based on the actual use and site conditions.
Why Pavement Repairs Sometimes Fail
A surface repair can improve the appearance of damaged pavement, but it may not resolve an underlying structural or drainage problem.
For example, if settlement is caused by weak or poorly compacted material beneath the pavement, repairing only the surface may not prevent the problem from returning.
Similarly, if water is contributing to pavement deterioration, addressing the surface without considering drainage may provide only temporary improvement.
This is why identifying the underlying cause is important before selecting a repair strategy.
How Geotechnical Engineering Supports Pavement Design
Geotechnical engineering provides information about the ground supporting the pavement.
Depending on the project, geotechnical work may involve:
- Soil investigation
- Subgrade evaluation
- Soil testing
- Groundwater assessment
- Pavement recommendations
- Earthwork recommendations
- Construction field reviews
The information can then be coordinated with the project’s civil and pavement design requirements.
Pavement Design for Commercial and Industrial Properties
Commercial and industrial properties can experience higher traffic loads than many residential applications.
Parking areas, loading zones, access roads and truck routes may therefore require careful consideration of expected traffic and subgrade conditions.
Pavement design can account for the intended use of the site and relevant engineering information.
When Should You Contact a Pavement Consultant?
You may want to consult a pavement or geotechnical engineer when:
- You are constructing a new parking lot
- You are developing a commercial property
- You are planning a new private road
- Existing pavement is repeatedly failing
- You are considering major pavement rehabilitation
- Heavy vehicles will use the pavement
- The site has difficult soil conditions
- Drainage problems are affecting pavement performance
Getting engineering input early can help the project team understand the condition of the existing pavement or the requirements for a new pavement structure.
What Should You Ask a Pavement Consultant in Surrey?
Before hiring a consultant, consider asking:
- Will the existing pavement need a detailed assessment?
- Should the underlying subgrade be investigated?
- What information is needed about expected traffic?
- Are drainage conditions contributing to the pavement problems?
- Is rehabilitation practical, or should the pavement be reconstructed?
- What testing is appropriate for the project?
- Will recommendations address both pavement and underlying ground conditions?
- Are construction field reviews recommended?
The appropriate scope depends on the pavement type, project size, site conditions and intended use.
Pavement Assessment and Design Services in Surrey, BC
Pacific Geotechnical provides pavement assessment and design services in Surrey, BC as part of its broader geotechnical engineering services.
Its pavement-related work can support projects involving roads, parking areas and other paved surfaces.
The company’s broader services include:
- Geotechnical site investigations
- Geotechnical reporting
- Foundation design
- Earthwork and excavation design
- Slope stability analysis
- Pavement assessment and design
- Geotechnical assessments
- Field reviews during construction
The appropriate scope is developed according to the requirements and conditions of each project.
Frequently Asked Questions
What is pavement assessment?
Pavement assessment is the process of evaluating an existing pavement’s condition and investigating factors that may be contributing to deterioration.
What is pavement design?
Pavement design involves developing an appropriate pavement structure for a new or reconstructed pavement based on factors such as subgrade conditions, traffic and project requirements.
Why does pavement crack in Surrey?
Cracking can have many causes, including traffic loading, aging, moisture, drainage conditions, material properties, subgrade movement and construction factors. The specific cause should be assessed rather than assumed.
Does soil affect pavement performance?
Yes. The supporting subgrade can influence pavement performance. Weak, variable or poorly prepared subgrade conditions may require additional engineering considerations.
Can pavement assessment determine why a parking lot is failing?
An assessment can help identify potential contributing factors by examining the pavement condition, underlying materials, drainage and other relevant site conditions.
Should pavement be assessed before resurfacing?
In many cases, understanding the condition of the existing pavement and its supporting materials can help determine whether resurfacing is appropriate or whether more extensive rehabilitation is required.
Does Pacific Geotechnical provide pavement design in Surrey?
Yes. Pavement assessment and design is one of the geotechnical services listed by Pacific Geotechnical for projects in Surrey and across British Columbia.
Make Pavement Decisions Based on Engineering Assessment
Pavement deterioration is not always just a surface problem.
Cracking, rutting, potholes and settlement can be influenced by traffic, drainage, pavement structure and the ground beneath the pavement.
Whether you are planning a new parking lot, developing a commercial property or trying to understand why an existing pavement continues to fail, a site-specific assessment can provide useful engineering information.
Pacific Geotechnical provides pavement assessment and design in Surrey, BC, along with geotechnical investigation and related engineering services.
Contact Pacific Geotechnical to discuss your pavement assessment, rehabilitation or new pavement design requirements.