8.1. Factors Affecting Durability

Try these first

1. 1.

   What is UV degradation?

   Hint

   Think about the sun and its effect on materials.

2. 2.

   Define thermal aging.

   Hint

   Consider how heat and cold might affect materials.

3. 3.

   What does UV degradation do to plastics?

   • Makes them stronger
   • Causes discoloration and brittleness
   • Has no effect

   Hint

   Remember the effect of prolonged sun exposure.

4. 4.

   Thermal aging can lead to which of the following?

   • True
   • False

   Hint

   Consider temperature changes and their effects on materials.

5. 5.

   A contractor wants to utilize PVC in a coastal environment where UV exposure is high. Propose a design approach that includes measures to combat UV degradation.

   Hint

   Consider what technologies can be employed for outdoor applications.

6. 6.

   Analyze the impact of temperature variations on a plastic bridge component and suggest design features to maintain integrity.

   Hint

   Think about structural elements that allow movement without compromising safety.