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Asphalt concrete is a common flexible-pavement surface and Portland cement concrete is a common rigid-pavement surface, but either can be appropriate only after those inputs are measured and analyzed. The workflow below shows what to collect, how to compare alternatives and how to document a design for a specific road.
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Why pavement material selection is a project decision
A road does not perform because of its top layer alone. Structural capacity, drainage, support layers, joints, curing or compaction, maintenance strategy and the underlying soil all influence whether the pavement carries traffic and survives its environment. FHWA describes pavement design as collecting technical inputs, analyzing strategies, comparing options and documenting the approved project design. See FHWA’s pavement design and analysis guidance.
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That is why labels such as “busy,” “cold,” or “heavy-duty” are inadequate specifications. Two roads with the same daily traffic can have different truck percentages, axle-load distributions, drainage, soil, construction windows and rehabilitation histories. The material decision should follow the design inputs rather than substitute for them.
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Start by defining the road and its performance requirement
Set project limits and function
Record the project limits, roadway functional class, number and width of lanes, intersections, shoulders, grade, geometry, access constraints and the pavement’s role in the network. A freeway mainline, an urban bus corridor, an industrial entrance and a lightly used rural road impose different loading and work-zone requirements. Identify whether the work is new construction, reconstruction, widening, an overlay or a preservation treatment.
State the desired future condition
Define the design period used by the agency, acceptable distress levels, ride and friction objectives, maintenance access, noise or appearance requirements and the consequence of lane closures. A project that must remain open to traffic may favor a strategy with simpler staging even when another alternative has attractive laboratory properties. Document these priorities before comparing materials so that cost or schedule does not silently replace the performance objective.
Characterize traffic and truck loading
Use current counts and a defensible forecast, classified by vehicle type and lane. FHWA mechanistic-empirical training treats traffic as a design input and addresses selecting traffic inputs by functional class in its participant workbook and Module E training page.
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- Identify the design lane and directional split, especially where one lane receives most heavy vehicles.
- Use loading information appropriate to the design method rather than relying on a “high,” “medium” or “low” traffic label.
- Account for bus routes, freight terminals, ports, quarries, warehouses and other generators that can change axle loading after opening.
- Separate construction traffic from normal operation when temporary loads could damage an incomplete structure.
Truck percentage and axle loading can change which asphalt mix, concrete structure, base treatment or thickness is viable. A high-volume urban highway with heavy trucks should not be designed with the same assumptions as a low-volume rural road merely because both are paved.
Characterize climate, water and site conditions
Climate affects binder and concrete behavior, moisture movement, freeze-thaw exposure and the performance of unbound layers. FHWA’s materials training discusses traffic and climate inputs, while its geotechnical manual explains how moisture and freeze-thaw influence unbound materials. Use the applicable agency method and local weather and groundwater information; do not apply a universal temperature cutoff that declares asphalt or concrete the winner. Relevant references are the FHWA mechanistic-empirical workbook, the Geotechnical Aspects of Pavements Reference Manual and FHWA’s concrete pavement materials and design guidance.
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Climate and moisture questions to answer
- What air and pavement temperatures occur during construction and service?
- How much precipitation, snow, flooding or seasonal wetting is expected?
- Does the site experience freezing, thawing, frost-susceptible soil or repeated saturation?
- Where is groundwater, and can it rise into the subgrade or base?
- Will shade, elevation, orientation or urban heat create local conditions different from a nearby weather station?
- Can the design drain water quickly and keep unbound layers within the moisture range assumed by the design procedure?
Climate is not a stand-alone material selector. It changes the demands placed on the structure and the consequences of poor drainage, inadequate curing, unsuitable aggregates or an incorrect construction season.
Investigate the foundation and existing pavement
Characterize subgrade soil, variability along the alignment, bearing and stiffness properties, moisture sensitivity, frost susceptibility, groundwater and the condition of base and subbase. For an existing road, map pavement type, layer history, repairs, distress type, severity and extent. The geotechnical manual explains that aggregate can serve as untreated base and that stabilization can make some otherwise unsuitable local materials usable: cement, asphalt, lime, fly ash or combinations can improve strength or stiffness and may change total thickness and economics. See FHWA’s geotechnical pavement reference.
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Questions for an existing pavement
- Is distress confined to the surface, or does it indicate weak base or subgrade?
- Are cracks environmental, load-related, reflective from an older layer or caused by movement at a joint?
- Has water entered through shoulders, joints, cracks or blocked outlets?
- Will an overlay hide a structural problem that needs reconstruction?
- Are existing materials compatible with the proposed treatment and agency specifications?
Material availability must be checked against quality, haul distance, stockpile capacity and specification limits. A locally available aggregate that needs stabilization may be more practical than importing a premium material, but the design must quantify the resulting structural and construction consequences.
Compare complete pavement systems
Asphalt concrete and Portland cement concrete are common surface-system families. Flexible and rigid designs both include supporting layers; comparing only the visible surface can produce the wrong answer. FHWA’s sustainability reference describes how site inputs and structural design affect performance, durability, lifecycle cost and construction; consult FHWA-HIF-15-002.
| Decision dimension | Asphalt concrete system | Portland cement concrete system |
|---|---|---|
| Structural concept | Flexible surface distributes load through asphalt, base, subbase and subgrade; layer properties and support control response. | Rigid slab action distributes load through concrete and the supporting foundation; slab, joints, base, subbase and subgrade must be designed together. |
| Key design inputs | Traffic and truck loading, temperature, moisture, mix and layer role, existing pavement, preparation, sublayer condition and drainage. | Traffic, concrete materials, climate, construction conditions, foundation support, slab and joint details, and environmental exposure. |
| Construction questions | Can each layer be produced, placed and compacted within the available work windows? Can the surface be reopened and maintained in stages? | Can batching, placement, finishing, curing and joint construction be controlled? How will staging and traffic be managed while the concrete gains required properties? |
| Maintenance planning | Plan for surface renewal, overlays or localized repairs consistent with the structural condition. | Plan joint, crack and slab preservation, repairs and any future overlays consistent with the concrete condition. |
| Economic comparison | Use project-specific construction, maintenance, user-delay and end-of-life assumptions. | Use the same project-specific assumptions; no universal cost or service-life advantage applies. |
The alternatives should be analyzed with the jurisdiction’s current procedure. FHWA’s design guidance allows strategy analysis and lifecycle-cost calculations to be part of the documented design, but the appropriate result depends on local inputs rather than a generic price or lifespan.
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Select an asphalt mix only after choosing its structural role
Choosing asphalt concrete as the pavement system does not finish the material decision. Mix selection depends on whether the layer is surface, intermediate or binder course, and on traffic, environment, pavement structure, existing condition, preparation, sublayer condition, drainage and economics. FHWA and the National Asphalt Pavement Association describe open-graded friction courses, stone matrix asphalt and fine- and coarse-graded dense mixes in the Mix Type Selection Guide; the publication record identifies the guide as FHWA and NAPA Information Series 128 (2001) at FHWA’s publication page.
| Mix family | Where the decision fits | What must be checked |
|---|---|---|
| Open-graded friction course | A surface-oriented option where texture, drainage through the layer or noise objectives are relevant. | Surface role, underlying support, drainage path, climate, traffic, maintenance and local specifications. |
| Stone matrix asphalt | A gap-graded option considered where the project requires its particular aggregate structure and surface or structural performance. | Truck loading, aggregate quality, production and placement capability, layer position, environment and economics. |
| Fine-graded dense mix | A dense-graded option whose gradation and layer use are selected for the project. | Surface or underlying course, traffic, climate, compaction, support and drainage. |
| Coarse-graded dense mix | A dense-graded option evaluated for the designated layer and structural system. | Layer thickness and role, aggregate structure, truck loading, environment, construction and cost. |
“What’s the best type of hot-mix asphalt (HMA) to use on a high-volume urban highway with heavy truck traffic?”
“Which mix type will result in optimum performance for a rural road with low traffic levels?”
These are the two road-specific questions posed by FHWA’s mix-selection material at the guide page. Neither has a responsible answer without the layer, traffic, climate, foundation, drainage and construction information for the actual project.
Design support layers and stabilization deliberately
Unbound granular base and subbase
Granular layers provide support and influence moisture, stiffness and drainage. Their gradation, durability, permeability, compaction and seasonal moisture behavior must be compatible with the structural design assumptions. A strong surface over a saturated or variable foundation remains vulnerable.
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Stabilized materials
When untreated aggregate or soil is weak, scarce or moisture-sensitive, evaluate stabilization with Portland cement, asphalt, lime, fly ash or combinations. Stabilization can improve strength and stiffness, alter layer thickness and expand the usable local material supply. It also adds mixing, curing, quality-control and specification requirements, so compare the complete installed system rather than the treatment price alone.
Account for construction, staging and timing
Constructability is a design input, not an afterthought. Compare plant and batch availability, haul routes, weather exposure, lane-closure limits, traffic switches, curing or compaction windows, inspection capability and the sequence needed to protect each layer. A theoretically strong material is unsuitable if the contractor cannot produce, place, compact, cure or protect it to the specification within the permitted season.
- Confirm that qualified aggregate, binder, cement, admixtures and stabilizing agents can be supplied in the required volume.
- Check whether the project can maintain drainage while layers are exposed.
- Plan interfaces between old and new pavement, including milling, cleaning, repairs and preparation.
- Define acceptance testing, trial sections and hold points before the work begins.
- Model traffic-control stages and the consequences of opening before the planned performance has developed.
Use lifecycle economics instead of first cost alone
Compare alternatives using the same project boundaries and assumptions: initial construction, traffic management, routine maintenance, rehabilitation, user delay, salvage or removal and the analysis period required by the agency. FHWA identifies lifecycle-cost calculations as a possible part of design documentation in its pavement design guidance and discusses durability, construction and lifecycle effects in its sustainability reference.
No universal asphalt-versus-concrete cost, emissions or service-life figure is established here. Costs and performance depend on quantities, local prices, traffic, climate, maintenance timing, agency practice and construction quality. A transparent sensitivity analysis is more useful than presenting one national average as a promise.
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- Define the project. Record limits, functional class, geometry, existing pavement, desired performance, construction timing and constraints.
- Assemble traffic inputs. Use current and forecast classified traffic, truck share, axle loading, lane distribution and seasonal effects appropriate to the agency design method.
- Assemble climate and water inputs. Compile local weather, temperature, precipitation, freeze-thaw exposure, groundwater and drainage conditions.
- Investigate the foundation. Characterize subgrade variability, base and subbase, moisture sensitivity, frost susceptibility and existing distress.
- Screen feasible systems. Develop complete flexible, rigid or rehabilitation alternatives, including layer materials, thicknesses, drainage and any stabilization.
- Select layer-specific materials. For asphalt, match mix family and gradation to layer role and project factors; for concrete, define materials, slab and joint requirements under the applicable procedure.
- Check construction feasibility. Verify supply, specifications, production, placement, compaction or curing, traffic staging, quality control and weather windows.
- Analyze performance and lifecycle cost. Compare predicted distresses, durability, maintenance, user impacts and costs using consistent assumptions.
- Run sensitivity checks. Test how uncertain traffic growth, truck loading, groundwater, material price, construction timing or maintenance dates change the preferred alternative.
- Document and approve. Record inputs, assumptions, calculations, selected materials, specifications, risks, inspection requirements and the agency approval path.
Use symptoms to revisit the right design input
| Observed concern during review | Questions to revisit |
|---|---|
| Expected rutting or deformation under trucks | Are truck loading and the design lane correct? Is the selected asphalt mix assigned to the right layer? Are support layers and drainage adequate? |
| Cracking risk in an overlay | What is the existing distress mechanism? Will preparation, repairs, interlayers or reconstruction address the source rather than cover it? |
| Seasonal loss of support | Are groundwater, saturation, freeze-thaw and subgrade variability represented? Does the drainage design match the assumed moisture condition? |
| Material cannot meet production or placement requirements | Is the specification compatible with local supply and equipment? Would another approved material or stabilized local source reduce execution risk? |
| Lifecycle result changes sharply with one assumption | Is the maintenance schedule, user-delay value, price or performance assumption supported by project evidence? Present the range and its consequence. |
These checks do not replace testing or the jurisdiction’s design procedure. They prevent a material choice from being used to conceal an unresolved traffic, water, foundation or construction problem.
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Concrete joint and crack sealants are a separate decision
After a concrete pavement system has been selected, preservation materials such as joint and crack sealants require their own evaluation. FHWA’s Concrete Pavement Preservation Guide, Second Edition identifies climate during installation and service, joint or crack characteristics and spacing, traffic and truck percentage, availability and cost as selection factors. Sealant extension properties must accommodate anticipated joint movement.
Sealant selection cannot compensate for choosing the wrong pavement system, inadequate foundation or poor drainage. Treat it as a maintenance-material decision within the concrete pavement plan.
Project information checklist
Before asking for a material recommendation, assemble the following minimum information:
- Project location, climate record, elevation and groundwater conditions.
- Roadway function, geometry, lanes, intersections and construction limits.
- Current and forecast traffic with classified truck and axle-loading data.
- Subgrade, base and subbase investigation, including variability and moisture behavior.
- Existing pavement type, layer history, distress survey and prior repairs.
- Drainage layout, outlets, shoulder condition and water-management constraints.
- Available aggregates, binders, cementitious materials, stabilization agents and haul distances.
- Applicable agency design procedure, specifications, testing and approval requirements.
- Design performance criteria, maintenance policy, work-zone limits and opening requirements.
- Consistent lifecycle-cost assumptions and sensitivity ranges.
What a defensible final recommendation contains
The final submittal should identify the selected pavement system and every layer, show the traffic, climate, foundation and existing-condition inputs, explain rejected alternatives, and state construction and maintenance assumptions. It should cite the governing specifications and design procedure, show how drainage and stabilization were handled, and record the quality-control and inspection requirements. FHWA’s training resources cover mechanistic-empirical inputs for traffic, climate, asphalt, concrete and unbound materials, but the current software version and local requirements must be confirmed with the responsible agency.
For a U.S. project, this framework is a starting point rather than a stamped design. A project-specific recommendation requires location and climate data, design traffic, subgrade and groundwater characterization, pavement history, available materials, performance criteria and the jurisdiction’s current procedure. The result should be an approved, documented structure—not a generic claim that asphalt or concrete is always better.
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