What is 9.5 mm asphalt used for?

HOT MIX ASPHALT CONSTRUCTION

A single course of 9.5 mm mixture is recommended due to the confined areas generally involved where constructing Sidewalk, Golf Cart Paths or Bike Paths except where poor subgrade is encountered.

What is 9.5 mm asphalt?

SP 9.5mm – This is a structural mix that is specified in lighter traffic load applications, specifically car traffic only. This mixture has a smoother appearance than the SP 12.5 mix and works well in a bottom or top lift. This mix is specified to be placed in 1″ to 1 ½” depth per lift.

What is the difference between 9.5 and 12.5 asphalt?

A 9.5 mm mix has a minimum VMA of 15.0 percent, a 12.5 mm mix is 14.0 percent, and a 19 mm mix is 13.0 percent. Smaller stone mixes have more aggregate surface area to coat, thus requiring more VMA and more asphalt. The lower the VMA, the lower the asphalt content for a given air void level.

What is the difference between 19mm and 9.5 mm asphalt?

19mm Binder Course is applied in one layer, is as strong as regular base and has a sufficient amount of liquid asphalt to roll into a very durable surface. The difference is that the texture is coarser than 9.5mm Wearing Course.

What are 3 types of asphalt?

There are three main types of asphalt: Hot Asphalt, MC Cold Mix, and UPM. There are also different varieties of these asphalts for summer and winter use. Below is a brief overview of each type of asphalt.

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What is the best thickness for an asphalt driveway?

Residential driveways typically use 2 to 3 inches of asphalt with 3 being suitable for occasional large trucks or heavy equipment. Underneath the asphalt you should have 6 to 8 inches of granular base aggregate.

What are the different sizes of asphalt?

Standard Superpave aggregate rock sizes range from 2 inches to minus #200 fines. Standard Superpave sieve sizes to measure aggregates range from 2 inch (50 mm) to #200 (. 075 mm). Superpave base courses typically use 1.5-inch or 1-inch rock.

Can asphalt be too thick?

If asphalt is applied too thickly, it won't be properly compacted, and over time, that can lead to depressions where traffic is frequent.

How thick should asphalt be over gravel?

For the standard residential driveway built on sandy, gravelly, or rocky soil, 2-3 inches of thickness is required. Having a 2-inch thick asphalt driveway is suitable for many people, but 3 inches will provide extra durability.

How thick are most asphalt roads?

Asphalt concrete (AC) is a standard Type B asphalt concrete mixed, spread and compacted as noted in the Caltrans standards. Base material (4 -8 inches) and AC depth (2 - 6 inches) will vary depending on site specific requirements.

What is the highest grade asphalt?

There are three different grades available in asphalt. The grades available are I-2, also known as base; I-5, known as top ;and the I-4 or commercial top grades.

What is the best asphalt to use?

Of all the asphalt types available, hot mix asphalt is the most commonly used on roads, pavements. It is a flexible mix of fine and coarse aggregate and asphalt binder, which produces a highly weather-resistant pavement. Hot Mix Asphalt is heated and poured at temperatures of about 300 to 350 degrees Fahrenheit.

How thick should hot mix asphalt be?

A 4-inch thickness may be adequate, but 5 or even 6 inches of full-depth asphalt will assure you of a stronger, stable driveway under a wider range of climate and loads. As an option, some contractors use 6 to 8 inches of compacted aggregate, or gravel, as a base under 3 inches of asphalt pavement.

How thick should commercial asphalt be?

A full-depth asphalt light-duty commercial parking lot will need a layer about 4 inches thick of asphalt on a solid and practical subgrade. For a heavy-duty commercial parking lot going with a full-depth asphalt layer, applying about 6 to 7.5 inches thick of the asphalt layer on a fine subgrade is best.

What is 9.5 mm Superpave?

9.5 MM Superpave This surface mix is recommended for most surface applications. Recommended minimum lift thickness 11/2". 4.75 MM Superpave This mix is designed primarily for thin lift leveling or correcting minor deviations. It is a fine mix that can be placed in lifts as thin as 1/2".

How thick is pavement in MM?

The thickness of surface course generally provided is 25 to 50 mm.

Can you pour asphalt on dirt?

Converting an old dirt driveway to a paved surface is easier than you might think, and asphalt is a great option to consider.

Why do they put gravel over asphalt?

The tar-like substance is actually an emulsion of water and liquid asphalt which penetrates and seals small cracks in the existing pavement. The “gravel” is actually aggregate that sticks to the emulsion and, after rolling and sweeping, provides a skid-resistant surface to improve safety.

What base to use under asphalt?

The secret to having the best asphalt driveway is by having a solid base. Using quality crushed gravel as a base to your blacktop will surely give you the perfect driveway quality that will last for a very long time.

Can you put a layer of asphalt over old asphalt?

An overlay or resurface can be used on an asphalt driveway, parking lot, or road way. It consists of installing a new layer of asphalt over the existing asphalt and grinding at the transitions (i.e. sidewalks, garages, drains, curbs, or other asphalt points).

How much weight can 2 inches of asphalt hold?

An asphalt driveway for residential use can hold approximately 8,000 pounds. Most residential driveways require 2″ to 3″ of asphalt for daily use.

What happens if asphalt is over compacted?

Over-compacting can cause the pavement to segregate and become This can lead to premature cracks and failure. Insufficient compaction can result in raveling of the pavement. This is when the asphalt mix begins to separate, and the aggregate components detach from the mix.

What is 19 mm asphalt?

19mm – Consists of one or more lifts of structural HMA place below the surface layers, distributing traffic loads preventing deformation in the pavement foundation. 25mm – This layer in the pavement system sits immediate below the wearing course, or binder course if used.

What is the minimum thickness of asphalt?

Asphalt Thickness:

Asphalt driveways need to be a minimum of 2” thick and are typically 3” (compacted).

What is the minimum thickness of asphalt base course?

The minimum recommended crushed aggregate base thickness is 4 inches. Substituting ACB for a portion of crushed aggregate is often acceptable, however if any crushed aggregate is to remain it should be at least 4 inches thick. The minimum recommended ACB thickness is about 3 inches.