Landscaping License Practice Test

What must be ensured about the sand layer when installing pavement?

1. It must be wet

2. It must be uniform in thickness

3. It must be loose

4. It must be colored

The correct answer is: It must be uniform in thickness

When installing pavement, ensuring that the sand layer is uniform in thickness is crucial for several reasons. A uniform sand layer provides a consistent base for the pavement, which helps to distribute the weight of the pavement and any loads placed upon it evenly. This uniformity prevents future settling or shifting of the pavement, which can lead to cracking, uneven surfaces, and ultimately, structural failure. Moreover, a consistent thickness helps in achieving proper drainage. When the sand layer is uniform, it facilitates even water flow, reducing the risk of pooling or erosion underneath the pavement. This aspect is critical because water accumulation can weaken the sub-base, compromise the integrity of the pavement, and create safety hazards for users. On the other hand, while it may be beneficial for the sand to be slightly moist for compaction during installation, a wet layer can also cause issues such as instability or lack of compaction. A loose layer may lead to uneven settlements over time, while the color of the sand does not affect its structural properties or functionality in the pavement installation process. Thus, maintaining a uniform thickness is essential to ensure the longevity and stability of the pavement.