Which material is identified as a polish resistant aggregate source?

Which material is identified as a polish resistant aggregate source?

• A. Limestone
• B. Sandstone
• C. Oolitic limestone from Miami-Dade County
• D. Clay

Answer: (C)

The identification of oolitic limestone from Miami-Dade County as a polish-resistant aggregate source is well-founded in its physical characteristics and performance in pavement applications. Oolitic limestone is formed from small spherical deposits called ooids, which contribute to its unique texture and natural interlocking properties. This texture aids in maintaining surface friction over time, which is particularly beneficial in high-traffic areas where skid resistance is vital for safety. In contrast, the other materials listed typically do not provide the same level of polish resistance. Limestone may wear down and become polished under traffic, particularly in wet conditions, leading to decreased friction. Sandstone, while it can have good compressive strength, often lacks the hardness and interlocking characteristics needed for polish resistance. Clay, being a softer material, is not suitable as an aggregate for pavement due to its lack of durability and potential for wear under traffic. Therefore, oolitic limestone from Miami-Dade County stands out as a superior choice for ensuring longevity and skid resistance in asphalt paving applications.

The identification of oolitic limestone from Miami-Dade County as a polish-resistant aggregate source is well-founded in its physical characteristics and performance in pavement applications. Oolitic limestone is formed from small spherical deposits called ooids, which contribute to its unique texture and natural interlocking properties. This texture aids in maintaining surface friction over time, which is particularly beneficial in high-traffic areas where skid resistance is vital for safety.

In contrast, the other materials listed typically do not provide the same level of polish resistance. Limestone may wear down and become polished under traffic, particularly in wet conditions, leading to decreased friction. Sandstone, while it can have good compressive strength, often lacks the hardness and interlocking characteristics needed for polish resistance. Clay, being a softer material, is not suitable as an aggregate for pavement due to its lack of durability and potential for wear under traffic. Therefore, oolitic limestone from Miami-Dade County stands out as a superior choice for ensuring longevity and skid resistance in asphalt paving applications.