What type of material should not be used for crack filling in transverse thermal cracks?

• A. Crack filling material.
• B. Concrete.
• C. Epoxy.
• D. Asphalt.

Answer: (B)

Transverse thermal cracks in pavement are typically caused by temperature fluctuations that lead to expansion and contraction. The correct approach to repair these cracks involves choosing a material that can accommodate movement while adhering well to the surrounding concrete.

Using concrete as a crack filling material is problematic because it is rigid and does not possess the flexibility or adhesive properties needed for effective crack sealing. When applied to a crack, concrete may not allow for the movements that occur due to thermal expansion and contraction, which can lead to further cracking and failure of the repair.

In contrast, materials like asphalt or specialized crack fillers are designed to remain flexible and can effectively adapt to the changes in volume and movement. Epoxy materials, while also often used for repairs, can become brittle over time and may not be suitable for all types of thermal movement. Therefore, selecting a flexible and appropriately adhesive material is key to the longevity and efficacy of crack filling in transverse thermal cracks.