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Concrete expands as it gets warmer and contracts as it gets colder. Left to itself these size changes can lead to cracks occurring, if different parts of the structure heats up/cools off at a different rate than other parts. By dividing the concrete into sections separated by joints that allow for some movement the thermal stresses can be managed and the risk of the concrete cracking goes away.
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Why are the concrete slabs laid with gaps?
Concrete expands when heated and contracts when cooled. Roads are built with gaps filled in with rubber, tar or other flexible mass which will not wash away when it rains. This prevents them from cracking into pieces as they contract in winter and prevents and buckling when it is hot in summer and the slabs expand. Bridges have gaps, usually a set of metal 'teeth' to prevent them from crushing themselves. If the gap is at vertical columns it is because the slab must be isolated from the columns so that when the building moves it will not crack the slab. The boxes (or diamonds) are lined around the perimeter of the opening with 1/2" expansion material and around the column to all movement (including the expansion and contraction of the slab itself). There are reasons to leave other holes such as for future plumbing work etc.
What is jet grouting?
Jet grouting is a type of ground improvement technique used to solidify and/or improve the bearing capacity of weak, unstable, or liquefiable soils. Jet grouting is performed by injecting a cement or lime-ash slurry into the subsoil using a drilling rig. As the grout column expands and solidifies the subsoil is consolidated and stabilized. This method of soil improvement allows foundation and structural construction in locations where previous geotechnical or seismic conditions deterred development..
What is organic planning?
Organic Strategic Planning is a unique approach to company growth. It changes the traditional strategic planning paradigms by focusing on identifying the best practices, processes, and methodologies in an organization. Organic Strategic Planning retains and expands on what is already working by employing a filter created from the organization's values, mission, and vision.The traditional approach to strategic planning often focuses on identifying and fixing problems. Being aware of where organizational changes are needed and courageously working on them can be quite effective. The unfortunate downside to focusing on problems is that, after a while, the organization forgets what it does best and focuses only what it does worst!Suite101.com :)
What causes potholes or large cracks in a pavement to appear in a street?
The main cause is in cold climates water gets into a tiny crack and then freezes and expands causing the crack to get larger and then when cars drive on it it will eventually cause the top layer of asphalt to break off. In warmer climates the constant wear of vehicles and heat from the sun dries the asphalt and causes the top layers of asphalt to crack, which can widen from rain water. Little cracks like in drive ways are usually caused by roots which can cause cement to crack and break up. To read more see attached link.
How does law of expansion and contraction work in thermometers?
The material in the thermometer expands and contracts as temperature increases or reduces.
What are examples of thermal expansion and contraction?
the Mercury in a thermometer expands when heated and contracts when the temperature cools down.
Why are pieces of rubber placed between slabs of concrete?
Concrete expands and contracts depending on the temperature. The strips are called expansion joints.
Why are there gaps at regular spots in the side walk?
They're called "expansion joints". Concrete expands and contracts with temperature changes. The expansion joints allow this to happen without cracking the concrete slab.
Why does the expansion joints in a sidewalk get narrow in the summer and get wider in the winter?
Expansion joints in sidewalks are designed to accommodate the natural expansion and contraction of the concrete due to temperature changes. In the summer, the concrete expands with the heat, causing the joints to narrow. In winter, when the concrete contracts in the cold, the joints widen to prevent cracking and damage to the sidewalk.
Matter expands or contracts to fill the space available?
Matter generally expands when heated and contracts when cooled. This is due to the changes in the kinetic energy of the particles within the matter. The expansion or contraction allows matter to adjust its volume to the space available.
How do tools such as a thermometer rely on thermal expansion?
Thermometers rely on thermal expansion because the liquid inside the thermometer (such as mercury or alcohol) expands and contracts with changes in temperature. As the temperature increases, the liquid in the thermometer expands, causing it to rise in the tube. Similarly, as the temperature decreases, the liquid contracts, causing it to fall in the tube. By measuring this expansion or contraction, the thermometer can accurately gauge the temperature.
What are the causes of expansion and contraction of water on soil formation?
in the daytime the suns heat expands rocks.and in the night it contracts. this causes the rocks to crack and eventually breakdown which foorms soil
What is a universe that expands and comes back together repeatedly?
A cyclic universe is one that expands and contracts in a never-ending cycle, repeating the process of expansion and contraction indefinitely. This theory suggests that the universe goes through phases of expansion, followed by contraction, ultimately leading to a big crunch, and then starting the cycle again with a new big bang.
What happens to the mercury in a thermometer Why?
The mercury in a thermometer expands and contracts as temperature changes. This expansion and contraction causes the level of mercury in the thermometer to rise or fall, providing a visual indication of the temperature.
What form of energy causes cracks in the road?
Thermal energy from the sun causes cracks in the road through a process called thermal expansion and contraction. When the road surface heats up, it expands, and when it cools down, it contracts. This repeated expansion and contraction over time can lead to cracks forming.
What is Thermal stress and the effects?
when the temperature of the body is lowered or raised, it contracts or expands accordingly. If this expansion or contraction is prevented, then a stress is produced called thermal stress
