How do you anchor something to pavement?

So what is a viable solution? Using "chemical" anchors. Chemical anchors use grout (epoxy or special cement) to bind the anchor to the asphalt. The grout flows into the crevices in the asphalt and the gravel below it, and bonds to the asphalt on the one side, and the the specially-designed anchor on the other side.

asphaltanchors.com - Pitfalls of Mounting to Asphalt

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Asphalt is not Concrete!

Asphalt and concrete have one property in common -- you can drive on either of them. But when it comes to attaching anything to asphalt, anchoring has nothing in common with concrete. The difficulty with anchoring to asphalt is that it will yield, over time, to continuous pressure. If you were to leave your car in the same spot for a year, the tires will leave a depression in the asphalt. And that is even though the pressure on the surface by the tires is very low -- around 35 PSI (pounds per square inch). Concrete anchors rely on the expansion of the anchor as it is tightened. The expanded anchor pushes against the walls of the hole around the anchor. The friction prevents the anchor from rotating or pulling out. But if the concrete was to yield by as little as 1/16", the holding forces will drop precipitously. Thus the resistance of the walls to pressure determines the pull resistance of the anchor. A good indicator of the rigidity of materials is their tensile or shear strength. The tensile strength of concrete is about 5,000 PSI. The tensile strength of asphalt is about 200 PSI at 70 degrees F when measured for short-term forces. Under continuous forces, the asphalt "creeps" and the resistance drops with time. The creep starts as soon as 10 seconds.

So what is a viable solution? Using "chemical" anchors.

Chemical anchors use grout (epoxy or special cement) to bind the anchor to the asphalt. The grout flows into the crevices in the asphalt and the gravel below it, and bonds to the asphalt on the one side, and the the specially-designed anchor on the other side. This bond is stress-free, and thus not subject to creep.

More on this subject in future blogs.

References: The research document below provides detailed insight into the properties of asphalt.

https://engineering.purdue.edu/NCSC/documents/presentations/MO_Creep_Compliance_and_Tensile_Strength_of_HMA.pdf

It follows that one can not use expansion anchors in asphalt. Even if it held at first, the creep would loosen the anchors within hours.

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Are screws more secure than nails?

Nails are a favorite for large jobs in construction because they're cheaper than screws and offer shear strength — or the ability to withstand shear pressure, where two surfaces slide past each other. But screws offer superior tensile strength over nails.

fastenmaster.com - When to Use Nails vs Screws? - Comparison Guide - FastenMaster

Because screws are much easier to remove than nails (you just adjust your power drill to reverse), they come in handy on temporary projects that might need adjusting later on. Nails bring a few benefits to your project, but it depends on what kind of project you’re up to. Nails are a favorite for large jobs in construction because they’re cheaper than screws and offer shear strength — or the ability to withstand shear pressure, where two surfaces slide past each other. But screws offer superior tensile strength over nails. “This makes screws better for projects when joined pieces are under tension or bearing weight, like porch railings or kitchen cabinetry. Another benefit of screws is their resistance to withdrawal pressure, or the tendency of surfaces to pull apart,” says Bob Vila.

Where Should I Use Nails vs. Screws?

There are a few ways to decide which fastener to use on your job. We’ll help you break that down, depending on which type of project you’re working on.

Exterior Jobs

Nails are a popular selection for roofing, siding and sheathing projects. The amount of fasteners that are needed in these projects makes nails a more attractive choice because they offer a lower price point.

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