thermal expansion
thermal expantion
thermal expantion
Dangerd
If there weren't any spaces between sections of the sidewalk, it could lead to several issues. First, the lack of expansion joints would cause the concrete to crack and buckle due to temperature changes and ground movement. Additionally, without gaps, water could accumulate, leading to potential slip hazards and increased wear on the surface. Ultimately, it would compromise the longevity and safety of the sidewalk.
Yes, it should be. If the sidewalk is not higher than the lawn water will collect on top of the sidewalk when it rains. If the temperature drops below freezing the sidewalk could crack.
spitting on the sidewalk
It depends on the size of the sections, but generally, no less than 4 inches.
The sidewalk being warmed by the heat of the sun is a physical process. The sun's rays transfer heat energy to the sidewalk through radiation, causing the molecules in the sidewalk to vibrate more rapidly and increase in temperature. This is a physical change as no new substances are being formed in this process.
sand applied to a slick sidewalk
Raised sections of sidewalk along treeline streets are typically a mechanical issue, caused by the roots of trees growing underneath the pavement. As tree roots expand, they can push up the concrete or asphalt, leading to uneven surfaces. This mechanical displacement is not due to chemical processes but rather the physical growth of the roots interacting with the sidewalk material.
When direct sunlight heats the sidewalk, the concrete absorbs the sun's energy. This energy increases the temperature of the sidewalk by causing its particles to vibrate more rapidly, resulting in the sidewalk feeling hot to touch.
As you walk barefoot on a hot sidewalk, the sidewalk molecules vibrate more due to the heat, transferring thermal energy to your feet. The heat is moving from the sidewalk (higher temperature) to your feet (lower temperature), causing your feet to feel hot. The increased molecular vibrations in the sidewalk result in the sensation of heat on your feet as thermal energy is transferred.