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3 Variables To Consider When Determining Asphalt Paving Costs

Asphalt pavements are made from a mixture of stones, sand, and liquefied asphalt cement at 300°F. Upon cooling, the mixture forms a hard surface that is capable of accommodating heavy weights including vehicles. When computing asphalt paving costs, key among the factors to consider include soil, usage, and size. It is essential that you consult an experienced constructor to give you a quote before commencing on a project to ensure that your budget is capable of executing the task to completion.

Soil

The type of soil in the area to be paved plays a vital role in influencing asphalt paving costs. The kind of soil has a direct impact on the type of subgrade that will be used to support the load which will be transmitted from the pavement. The cost of paving increases with the increase in subgrade thickness. The subgrade is the working platform upon which the construction equipment is supported and is also the foundation to the pavement structure for supporting and distributing the traffic load. It is, therefore, critical to evaluate the how strong the subgrade should be before embarking on a pavement’s structural design. Failure to provide the required subgrade thickness can result in deflection rendering your work to be useless. Different soil types have to vary (texture) support capabilities which influence the depth of the subgrade. Soil texture is the average size of its mineral particles, and it defines how a type of soil can be used. Usually, most natural soils are made of different particle sizes which are used to distinguish one type from the other. Soils can be categorized into three main classes based on texture: Light, medium, and heavy-textured or fine grained. The three categories can further be classified as gravels, silts, sands, or clays.

Usage

The core function of an asphalt pavement is to distribute the weight on the wheels to the supporting subgrade. Asphalt paving costs vary with the type of load that will be accommodated on the pavement. Axle load can be classified into single, tandem, and multiple and can weigh up to 50,000 pounds. Asphalt pavements for use by tandem and multiple axle loads experience reduced load effects and thus, have a long lifespan. Asphalt pavements for use by single axle loads lack a diminished load effect and are thus, costly to pave due to the high-quality requirements to lengthen their lifespan. The volume and distribution of a load play a critical role in estimating the anticipated life of asphalt pavement and consequently, its cost. Usage of asphalt pavement can be predicted based on historical traffic records and truck percentage. To determine the effect of traffic, you require to establish the total volume of the two-way Average Daily Traffic (ADT). You can estimate a road’s ADT by use of a traffic map or a pneumatic tube on the road for some days. Traffic weight can have a dramatic effect on asphalt paving costs. Design differences have a direct impact on material, labor and equipment costs.

Size

The size of the area to be paved also impacts on the cost of asphalt paving. Size differences can be in parameters such as the gradient of the area to be paved, the extent of ground clearance required including the removal of physical barriers such as trees and buildings. Also, the cost of paving can be affected by whether the pavement will be flat or will have peaks and depressions to control the movement of storm water.

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The Cost of Drainage Issues on Your Pavement

Pavements are important to our contemporary lives by providing a smooth surface onto which we can transport goods and people as well as communicate with each other. Therefore, it is important to keep your pavements in optimal shape. This can be achieved through proper drainage. It is considered the element that ensures a long lived quality pavement. Problems can occur due to moisture accumulation in any structural layer of the pavement.
Long-term problems can not only be caused by standing water from heavy rain or sprinklers but also from underground water, which is harder to detect. Cracks in the pavement provide a way for the ground water to seep into the parking lot from below the surface. Some of the drainage issues affecting pavements include;

Winter Liability
During winter months, your pavement can quickly fill up with ice formed by seeping groundwater. The people walking here may be in danger of injury resulting in liabilities for you and your business. It may also make it difficult to control a vehicle as hydroplaning can occur at speeds as low as 35 MPH.

Water ponding
This refers to the collection of water at deteriorated shoulders or pavements. Ponding can be caused by a backup in the drainage system or an insufficient cross slope. The pavement’s original cross slope can be affected by both maintenance and traffic activities. It is especially hazardous at intersections a driver will require greater distances to stop. It is also dangerous in wheel paths or ruts. Wheel ruts are caused by traffic, especially heavy truck traffic, resulting in bituminous pavement movement to the wheel path sides. They are noticeable and run parallel to the pavement’s centerline.
Ponding can cause drivers, pedestrians, or bicyclists to divert paths, often encroaching the opposing lane. This endangers their lives as well as the lives of opposing motorists. Ponding contributes to the rutting of stabilized soil and deterioration of the pavement edge resulting in additional safety hazards. Vegetation growth and debris build-up can cause shoulder to scour and edge drops when the pavement edge traps water.

Shoving
Occurring frequently at stop locations such as intersections, this pavement condition results in the pavement having a series of ridges running across it. These ridges are hazardous when wet and dry as they can retain water and cause a vehicle’s wheels to bounce respectively. This bouncing decreases braking ability and reduces the pavement’s contact with the wheels.

Issues with Maintenance
Sealers may not work as they should due to the water and leak impact on asphalt. Wet asphalt does not enable the adhesion of sealant. The sealant will re-emulsify and be easily tracked into stores or cars. You can experience difficulties in maintenance due to poor location, trapped debris, flat grades causing clogging of pipes, and low-flow conditions lacking self-cleansing velocities.

Long Term Damage
Standing water may result in structural damage which is long-term and costly. Lack of adequate maintenance can also result in long-term, costly damage. The weakening of entire areas will happen first, then falls and large cracks will occur. Not short-term fixes will be available for potholes.

Drainage issues can be hard to detect, but they result in some costly mistakes. You should strive to prevent the accumulation of these small issues before they develop into major problems.

By admin Asphalt Paving • • • • • • 0 Comments

Top 6 Factors that Affect Asphalt Paving Costs

Asphalt is one of the leading paving choices for its affordability and cost-efficiency. When an asphalt parking lot or driveway is properly paved and maintain, it can last for decades.

When installed properly, asphalt becomes less visible to most users than other parts of a construction project. For incredible end result, ensure asphalt installation is of high quality. Finding a balance between value and cost within a budget can be an uphill task.

So, what factors can affect asphalt paving cost?

 

Total Square Footage

When planning for asphalt paving, the size of coverage needs consideration. Long and wide pavements need a significant amount of base material, labour, time, and asphalt to complete. The depth of the prepared site is also an important factor.

Some tools like the Basic Construction’s Asphalt Calculator can approximate the amount of materials required. Estimation is made with reference to a benchmark mix density of 148 pounds per every cubic foot.

Although densities vary between mixes, the stated value is a standard rule-of-thumb ideal for estimation purposes. Reduced bulk rates may be available for considerably large projects.

 

Asphalt thickness based on load requirements

In most projects, a 4-inch depth is usually adequate. Nonetheless, 5 to 6 inches of full-depth asphalt guarantees a stable and strong paving ideal for a wide range of loads and climates. Some contractors make use of 6 to 8 inches of compacted gravel or aggregate as a base for 3-inch asphalt pavement. Routinely, the cost incurred to apply asphalt to a parking lot is cheaper than that of a driveway. The greater surface results in price reduction per square foot. Heavy loads require thicker asphalt layers resulting in a more significant budget.

 

Possible obstructions

The lifespan of any paved surface relies on proper drainage. In case there are obstructions, more work is needed to make enough room for the new asphalt paving. Extra work increases the cost necessary to construct the asphalt pavement to completion.

 

Distance to the nearest hot plant

Asphalt transport cost from the production plant to the project site is a considerable factor in budgeting. Also, the type of asphalt required affects transport costs. Hot mixes cost more to transport than warm blends.

Some suppliers manufacture in-house asphalt while others combine raw materials from various locations. The best and most dependable suppliers own and operate an asphalt plant. They use their manufactured materials to make the asphalt guaranteeing consistent and high-quality products.

 

Permit requirements

Any asphalt project connecting to a public road must satisfy necessary requirements of the municipality. A permit may be necessary, and in some cases, you may need to change plans to suit municipality requirements. Changes and acquisition of permits may result in increment of the project cost.

 

Quality of the base

High quality base guarantees durability. However, it also attracts high cost. Installing between 8 and 10 inches of gravel below your asphalt is essential for drainage. The higher the material quality of the base, the more expensive your asphalt project becomes.

It is undeniable that asphalt is the most preferred material for paving. Before any undertaking, prepare a budget. Include every detail that may change costs. If you’re working on a shoe string budget, consider consulting an expert to help you minimize cost and maximize quality. Call us today to speak with one.