General Contractor Practice Exam

What is a common property of open graded asphalt concrete?

1. High density

2. Heavily bound particles

3. Minimal fine material

4. Cold weather resistance

The correct answer is: Minimal fine material

Open graded asphalt concrete is characterized by having minimal fine material, which is a key property that differentiates it from other types of asphalt mixtures. This composition allows for enhanced drainage and reduces the likelihood of water accumulation on the surface. The lower amount of fine aggregates creates larger voids within the mix, promoting better permeability. As a result, open graded asphalt concrete can effectively manage surface water and provide better traction in wet conditions, which is particularly beneficial for reducing hydroplaning risks. This minimal fine content also contributes to the structure's flexibility and sound absorption qualities, making it a popular choice for applications such as noise barriers on roads and parking lots. While high density is more associated with dense graded mixtures, and bound particles imply a stronger adherence of materials, these attributes do not define open graded asphalt. Cold weather resistance is also not a primary characteristic of open graded asphalt; instead, this is more relevant to other specific asphalt formulations designed to withstand extreme temperatures.