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Asphalt Paving & Concrete FAQs

Asphalt Paving & Concrete FAQs

New Asphalt Pavement

When comparing asphalt paving and concrete for driveways or parking lots, there are several pros and cons to consider.

Asphalt paving offers the following advantages:

  1. Flexibility: Asphalt is a flexible material that can withstand slight movements in the base and adapt to changes in temperature. This flexibility allows it to resist cracking and damage caused by freeze-thaw cycles and ground movements, making it suitable for regions with fluctuating weather conditions.
  2. Cost-effectiveness: Asphalt generally has a lower upfront cost compared to concrete. It is less expensive to install and requires less labor and time for construction. Additionally, maintenance and repair costs tend to be lower for asphalt compared to concrete, making it a cost-effective choice over the long term. However, asphalt is more likely to need repairs sooner than concrete. 
  3. Quick installation and usability: Asphalt can be laid and ready for use relatively quickly. It cures faster than concrete, allowing for faster access to driveways or parking lots once the installation is complete. This is particularly beneficial for areas with heavy traffic or businesses that cannot afford long periods of disruption.

On the other hand, concrete paving offers the following advantages:

  1. Durability: Concrete is a rigid material that offers excellent long-term durability. It can withstand heavy loads and is less susceptible to damage from vehicles, such as tire marks or oil spills. With proper maintenance, concrete can have a longer lifespan compared to asphalt.
  2. Aesthetics and customization: Concrete offers more options for customization in terms of color, texture, and pattern. It can be stained or stamped to create a unique and visually appealing surface. This makes concrete a preferred choice for those who prioritize aesthetics and want a distinctive look for their driveway or parking lot.
  3. Maintenance and repairs: While concrete may have a higher initial cost, it generally requires less frequent maintenance and repair compared to asphalt. Concrete surfaces are less prone to cracking and potholes, and any repairs needed are usually localized rather than requiring extensive resurfacing.

It's important to note that personal preferences, regional factors, and specific project requirements will influence your decision between asphalt and concrete. Consulting with a professional paving and concrete contractor like Winstar Concrete can provide valuable insights and help you make an informed choice based on your needs, budget, and the conditions in your area.

Paving during the colder winter months is not advised due to the challenges posed by low temperatures. Asphalt needs to be hot and workable for proper compaction, and cold temperatures can cause it to cool rapidly, reducing the available time for compaction. When asphalt is mixed at the plant it is superheated to more than 325° F. By the time it arrives at the job site it should still be a minimum of 250° to allow it to be properly compacted. Inadequate compaction can lead to reduced density, premature cracking, and decreased durability. Additionally, winter weather often brings precipitation and freezing temperatures, which can further impede the paving process and compromise the integrity of the installation. It is generally recommended to schedule paving projects for warmer months when ambient temperatures are more favorable. Working with professional paving contractors ensures that your driveway or parking lot is installed under optimal conditions, maximizing its longevity and performance.

The curing of a new asphalt surface depends on various factors, including temperature fluctuations. While complete curing typically takes over 30 days, it may be possible to drive on the surface earlier with caution. The curing time varies based on temperature and weather conditions, and regions with significant day-to-night temperature differences may experience a longer curing process. It is generally advised to avoid driving on the surface for the first two to three days after installation to allow it to set and harden. During this time, it is important to be careful to avoid damaging the fresh asphalt. While driving may be permitted after a few days, it's important to remember that the asphalt is still in the curing process and not at its optimal strength. Following the recommendations of asphalt professionals and contractors is crucial to ensure the durability and longevity of the asphalt surface. By understanding the curing process and taking necessary precautions, you can help protect and maintain the integrity of your new asphalt surface in the long run.

Proper compaction is essential for a durable asphalt surface, aiming for around 90% compaction. However, it's common for rollers to leave temporary streaks or marks during compaction. These marks are caused by the pressure exerted on the asphalt by the rollers. Fortunately, these marks are temporary and tend to fade over time due to exposure to weathering and traffic. Vehicle movement, sunlight, and natural elements gradually smooth out the surface, blending in any visible streaks or marks. The rate at which these marks fade can vary depending on factors like the asphalt mix, weather, and traffic. It typically takes several months for the surface to fully blend and for the marks to become indistinguishable. Working with experienced paving professionals who understand proper compaction techniques can help minimize the appearance of these temporary marks and achieve a smoother surface. By following recommended maintenance practices, you can ensure a long-lasting and visually appealing asphalt surface.

Tire scuff marks can occur on newly paved asphalt surfaces if the asphalt hasn't fully cured. When the car's steering wheel is turned while stationary, the hot asphalt can develop blemishes due to the pressure and friction from the tires. On hot days, the curing process can be affected, but over time, these scuff marks tend to become less noticeable as the asphalt cures and hardens. It's recommended to avoid turning the wheels while the asphalt is curing to minimize scuff marks. With patience, the marks will gradually fade as the asphalt continues to cure and undergo weathering effects. Allowing sufficient time for curing and following professional guidance will ensure the long-term durability and appearance of the asphalt surface.

Essentially all asphalt is black. When the aggregates (stone) are mixed together with hot asphalt cement, the mass of material becomes black. Over time, as the asphalt oxidizes, the coating on the aggregates breaks down and the color of the aggregate starts to show through. This can lead to a ‘grayish’ color if the asphalt plant uses a light color aggregate. Outdoor basketball, pickleball, and tennis courts are typically painted using 2+ coats of acrylic paint; however underlying asphalt will always remain gray - black. 

The texture variations in different areas of asphalt surfaces can be explained by multiple factors. Asphalt consists mostly of aggregates and a small amount of black asphalt cement. The size and composition of these aggregates can vary, resulting in differences in texture and appearance. Additionally, different asphalt plants and suppliers use unique blends of aggregates, leading to variations in texture between loads and areas of the pavement. Environmental conditions like temperature and humidity during installation can also influence texture. Factors such as the type of equipment and techniques used during paving can further impact the surface texture. Importantly, while these variations are normal and expected, they do not affect the performance or durability of the asphalt. The primary purpose of asphalt is to provide a smooth and durable driving surface, and the texture differences typically do not compromise the integrity of the pavement.

Sealcoating & Resurfacing

Resurfacing and sealcoating are two methods used to maintain and improve the condition of driveways, parking lots, or roads. Resurfacing, also known as rehabilitating, involves extensive structural repairs by patching and then applying a new layer of asphalt to the surface. This process is suitable for surfaces with significant damage, addressing cracks, potholes, and deteriorated areas. Resurfacing typically involves defect repairs (patching) to strengthen the underlying structure followed by overlaying 1.25”-3”+ of hot bituminous asphalt to extend the lifespan of the asphalt. 

On the other hand, sealcoating is a preventive measure that protects the asphalt from UV rays, moisture, chemicals, and environmental factors. It acts as a shield but does not repair structural flaws. Sealcoating is less expensive compared to resurfacing, making it a cost-effective option. Understanding these differences will help you decide which approach suits your needs and budget.

When your driveway or parking lot begins to deteriorate, it is wise to address the specific areas of concern promptly rather than waiting for the entire area to deteriorate further followed by resurfacing. Taking early action is more cost-effective and will reduce the overall cost of resurfacing. 

A driveway or parking lot should be patched and resurfaced with at least 1.25”-3” of hot mix asphalt as soon as possible if there are signs of deterioration such as alligator cracks, seperation, and indentations. The cost of defect repair per applied ton is 3-5x higher than new asphalt per ton. When new asphalt is installed it is important there is a sufficient subgrade of 4”+ of GABC which will help to reduce pavement defects and ensure the longevity of the pavement.

Some people might be concerned with the color difference and look of new asphalt and their existing asphalt. If you are concerned with the difference in color a less expensive option to fix this would be sealcoating your pavement after patching is completed. We use a commercial grade asphalt emulsion sealer, intended to last 5+ years depending on traffic however, some people choose to resurface rather than sealcoat to increase the longevity and aesthetic appeal of their pavement if budget is not a factor.

As an experienced asphalt paving and concrete contractor, we highly recommend clients to have their existing concrete removed before paving. It is likely your existing concrete has a sufficient stone subgrade to be paved, so there shouldn’t be any additional sitework necessary once the existing concrete is removed. For example, for a parking lot that has concrete areas because of its previous use, we would recommend to either remove the concrete and pave or sealcoat the concrete to help match the asphalt pavement. However, sealcoating over concrete will not last in the long-term as commercial asphalt emulsion sealer does not adhere well to concrete. 

In some instances we have paved over concrete using Petrotac paving fabric over the concrete expansion joints to minimize asphalt cracking however this can work in some instances but not in others. The issue lies in the nature of concrete and asphalt pavement. Concrete is rigid with expansion joints and is designed to move at those joints. Asphalt pavement does not have expansion joints but overall is more flexible and will adjust with the ground’s movements much more than concrete. Petrotac paving fabric or similar helps to reduce the asphalt pavement cracking at the concrete’s joints however eventually the asphalt pavement will crack in those places.

This is dependent on the amount of direct sunlight and traffic that an area gets. As a rule of thumb, a surface should be sealcoated 2 years after paving and then every 3-4 years after that. Please note, it is important not to sealcoat every year as after sealcoating too many times within a short amount of time will cause the pavement to become very smooth and slick when it rains.

Addressing poor drainage on your driveway is crucial to prevent water accumulation and potential damage. Ideally, good drainage requires a minimum of 2% slope, meaning a ¼" decline for every foot of pavement. However, many driveways lack this desired grade, resulting in water pooling issues. Solutions include installing drains to collect and redirect water, creating swales to guide water away, and installing curbs as physical barriers. Permeable pavers or porous asphalt can also reduce runoff. While some ponding water may be expected in areas with limited grade, it's important to manage it. Consulting a professional paving contractor or drainage specialist is recommended to assess the specific issues and determine the best solution. By implementing effective drainage measures, you can maintain your driveway's integrity and prevent water-related problems.

To prevent cracking and damage to the edges of your driveway or parking lot, it is important to focus on proper support, reinforcement, and maintenance. During construction, creating a beveled edge with a 45° angle helps distribute pressure and reduce the risk of cracking or breaking. After the paving is done, installing seeded topsoil along the edge adds reinforcement. Seeding the topsoil with grass or vegetation helps bind the soil and provides stability to the edges. Additionally, avoiding excessive weight on the edges, such as from sharp-edged vehicles or heavy equipment, is crucial. Regular inspections should be conducted to identify any signs of cracking or damage, and any issues should be promptly addressed by a professional paving contractor. By following these measures, you can protect the edges of your driveway or parking lot, ensuring their durability and longevity.

Oil leaks from cars can have a detrimental effect on asphalt pavement. Substances like oil, gasoline, and brake fluids act as solvents that soften the asphalt and weaken its structure. These solvents penetrate the asphalt binder, causing a loss of cohesion within the pavement. Over time, repeated exposure to oil leaks can result in cracks, potholes, and deformation. The softened asphalt is also more susceptible to the effects of traffic, leading to ruts, depressions, and uneven surfaces. Furthermore, oil can cause discoloration and staining, diminishing the aesthetic appeal of the pavement. Promptly addressing oil leaks, repairing vehicle issues, and regularly maintaining parking areas and roadways are crucial to minimize damage. This includes cleaning up spills promptly and using absorbent materials for oil removal. By taking these measures, the integrity and appearance of the asphalt can be preserved.

Concrete

When comparing asphalt paving and concrete for driveways or parking lots, there are several pros and cons to consider.

Asphalt paving offers the following advantages:

  1. Flexibility: Asphalt is a flexible material that can withstand slight movements in the base and adapt to changes in temperature. This flexibility allows it to resist cracking and damage caused by freeze-thaw cycles and ground movements, making it suitable for regions with fluctuating weather conditions.
  2. Cost-effectiveness: Asphalt generally has a lower upfront cost compared to concrete. It is less expensive to install and requires less labor and time for construction. Additionally, maintenance and repair costs tend to be lower for asphalt compared to concrete, making it a cost-effective choice over the long term. However, asphalt is more likely to need repairs sooner than concrete. 
  3. Quick installation and usability: Asphalt can be laid and ready for use relatively quickly. It cures faster than concrete, allowing for faster access to driveways or parking lots once the installation is complete. This is particularly beneficial for areas with heavy traffic or businesses that cannot afford long periods of disruption.

On the other hand, concrete paving offers the following advantages:

  1. Durability: Concrete is a rigid material that offers excellent long-term durability. It can withstand heavy loads and is less susceptible to damage from vehicles, such as tire marks or oil spills. With proper maintenance, concrete can have a longer lifespan compared to asphalt.
  2. Aesthetics and customization: Concrete offers more options for customization in terms of color, texture, and pattern. It can be stained or stamped to create a unique and visually appealing surface. This makes concrete a preferred choice for those who prioritize aesthetics and want a distinctive look for their driveway or parking lot.
  3. Maintenance and repairs: While concrete may have a higher initial cost, it generally requires less frequent maintenance and repair compared to asphalt. Concrete surfaces are less prone to cracking and potholes, and any repairs needed are usually localized rather than requiring extensive resurfacing.

It's important to note that personal preferences, regional factors, and specific project requirements will influence your decision between asphalt and concrete. Consulting with a professional paving and concrete contractor like Winstar Concrete can provide valuable insights and help you make an informed choice based on your needs, budget, and the conditions in your area.

Concrete is a versatile construction material made by combining cement, water, aggregates, paste, and additives. Mineral colors can also be added to create a wide range of shades and vibrant colors. Cement acts as the binding agent, while aggregates provide stability and the paste ensures cohesion. Additives can modify specific properties of the concrete, and the inclusion of mineral colors allows for customizable designs. With its strength, durability, and aesthetic versatility, concrete has the power to transform spaces and create visually stunning structures.

Concrete strength is a crucial factor in determining its structural integrity, and scientists use scientific methods to measure it accurately. Compression and flexural mechanical strength tests are commonly employed for this purpose. Compression tests involve applying increasing pressure to concrete samples until they reach their maximum load-bearing capacity, simulating real-world conditions and assessing the concrete's ability to withstand compressive forces. 

Flexural mechanical strength tests evaluate how well concrete can resist bending or flexing by subjecting samples to loads that cause them to bend, measuring the concrete's capacity to endure forces applied perpendicular to its surface. 

Concrete strength depends on factors such as the water-to-cement ratio and the quality of materials in the mixture. Controlling the water-to-cement ratio and using high-quality materials with appropriate grading and chemical composition enhance the overall strength and durability. Compressive strength is typically reported, but other strength properties like tensile and flexural strength are also important. By conducting strength tests and optimizing the concrete's composition, scientists ensure that it meets the requirements of diverse construction projects.

The time it takes for concrete to cure depends on factors such as the depth of the concrete, ambient temperature, and type of cement used. Typically, concrete sets and achieves initial hardening within 2-3 hours. After that, it undergoes a curing process that lasts around 7 days to reach its full strength. The setting phase involves the transition from a plastic state to a solid state, influenced by mix composition and environmental conditions. Proper curing, which optimizes cement hydration, is crucial for maximum strength and durability. Concrete generally requires 7 days of curing, but specialized cements or admixtures may have different timeframes. Factors like temperature and humidity affect curing, with higher temperatures speeding up the process. While concrete reaches its maximum strength in 7 days, it continues to gain strength for up to 28 days or longer. Ample curing time is vital before subjecting concrete to heavy loads to ensure long-term durability.

Concrete's versatility in color options is enhanced by the incorporation of mineral colors, enabling a broad spectrum of vibrant hues and shades. The addition of pigments or mineral admixtures during the mixing process allows concrete to be customized, offering endless design possibilities. From warm earth tones to cool contemporary shades, the color potential for concrete is virtually limitless. This flexibility enables the creation of visually stunning structures and surfaces that seamlessly blend with their surroundings. The long-lasting beauty of colored concrete is ensured by the durable and fade-resistant nature of the pigments and admixtures used. This resilience allows the vibrant colors and attractive appearance to endure exposure to sunlight, weather conditions, and regular wear and tear, enhancing the aesthetic appeal of outdoor and indoor spaces. In summary, mineral colors transform concrete into an aesthetically pleasing and personalized element, providing an extensive palette for creative and customized designs that add beauty and character to any project.

Proper maintenance is crucial for ensuring the longevity and optimal condition of concrete. To enhance its durability, consider the following maintenance tips:

  1. Avoid using deicing chemicals: Deicing chemicals can harm concrete by penetrating its pores and causing cracks and spalling. Instead, use non-corrosive deicers or sand as alternatives during winter.
  2. Use mild cleaning solutions: Harsh acids can damage concrete surfaces. Opt for specialized cleaning solutions designed for concrete to remove stains effectively without causing harm.
  3. Regularly clean your concrete: Clean your concrete periodically to remove dirt, debris, and organic matter. Use a broom or a gentle pressure washer. Promptly clean spills and stains to prevent long-term discoloration or damage.
  4. Apply a protective sealant: Apply a high-quality sealant to create a barrier that protects the concrete from moisture, staining, and UV radiation. Consult with professionals to select the appropriate sealant for your specific application.
  5. Monitor and repair cracks: Inspect your concrete regularly, especially after extreme weather events. Promptly repair any cracks to prevent them from expanding and compromising the structure. Consider using joint systems or fibrous products during construction to control cracking.

By following these maintenance practices, you can extend the lifespan of your concrete, preserving its appearance, functionality, and durability for years to come.

Cracking in concrete is a normal occurrence due to its rigid nature and environmental factors like freeze/thaw cycles. Small cracks are generally not a concern as they don't compromise the concrete's strength. To mitigate cracking, joints can be strategically placed to allow controlled cracking in specific locations, and adding fibrous products to the concrete mix can enhance its durability. It's important to monitor cracks and address large or extensive ones, as they may indicate structural issues. Understanding the causes of cracking and implementing preventive measures can help minimize cracks and ensure the long-term integrity of concrete. Regular inspections and maintenance are crucial for identifying and addressing cracks promptly to maintain the performance of concrete surfaces.

Concrete is commonly measured in cubic yards, which represents a volume of three feet by three feet by three feet, equal to 27 cubic feet. This measurement unit is widely used in the construction industry to determine the amount of concrete needed for a project. Accurately estimating the concrete volume is crucial for material and cost calculations. Contractors and suppliers rely on cubic yards as a standardized unit for ordering and delivering concrete, ensuring they have enough supply for successful project completion. The weight of concrete can vary based on composition and application, with a typical weight of around 4,000 pounds or two tons per cubic yard. Specific weight requirements may vary for specialized mixes or specific projects. The use of cubic yards allows construction professionals to efficiently plan, estimate costs, schedule deliveries, and manage the concrete pouring process effectively.

Concrete is a recyclable material that incorporates recycling throughout its lifecycle. By using waste materials and industrial byproducts in concrete mixes, the reliance on raw materials is reduced and waste generation is minimized. Additionally, when concrete structures reach the end of their lifespan or undergo renovations, they can be recycled by crushing and grinding them into recycled concrete aggregate (RCA). This RCA can be used as a substitute for natural aggregates in new concrete mixes, closing the recycling loop. Recycled concrete aggregate has various applications and offers similar properties to conventional aggregates while conserving resources and reducing the demand for new concrete production. Concrete recycling contributes to sustainable construction practices, conserves energy, reduces greenhouse gas emissions, and supports a circular economy. Overall, concrete recycling promotes a more environmentally friendly and resource-efficient construction industry.