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Decomposed granite and caliche can both harden into a solid surface using a plate compactor. However, due to decomposed granite’s fine particles, it’s not suitable for driveway surfaces. Some homeowners use pea gravel mixed with a gravel-binding resin to bind the loose stones and create a solid surface that won’t shift like loose gravel.

While blacktop is a type of asphalt, the terms should not be used interchangeably, as not all asphalt qualifies as blacktop. The primary differences are in their composition, production process, and ideal applications. Blacktop contains more stone than other types of asphalt and is heated to a higher temperature during production—300°F or more—while hot-mix asphalt is heated to between 275°F and 300°F. The ratio of bitumen (a tar-like crude oil) is a key differentiator, though sources vary: some state blacktop has less bitumen, making it less durable, while others claim it has a higher ratio. Due to these differences, asphalt is generally more durable and better for high-traffic areas like highways and streets, while blacktop is more suitable for playgrounds and residential driveways. For a driveway project, it is best to consult a professional to determine the most appropriate material.

The best ways to increase the lifespan of your driveway are to carry out proper maintenance and get repairs done quickly. First, reseal your driveway every one to three years to protect it from the elements. If you start to notice significant cracks, hire a professional to diagnose the problem before it gets more serious. You can also use sand instead of salt when de-icing your driveway (since salt is corrosive) and clean your driveway annually using a pressure washer to keep it in tip-top shape.

It takes recycled asphalt 48 hours to initially harden and up to 3 months to fully cure. It’s best to stay off of recycled asphalt for at least 48 hours, then you can walk or drive standard vehicles on it. Hold off on driving heavy trucks or equipment on it for at least 7 days. Allowing the surface to melt together and harden ensures that the surface stays durable and long-lasting.