Crack is made by cooking cocaine powder with baking soda, then breaking it into small pieces called rocks. It got its name because it crackles when it is heated and smoked.
Cracking is a common damage caused by stress in a material that can easily be exaggerated by other factors, including corrosion, fatigue, high pressure, and material of construction.
We explain 6 of the most common types of concrete cracks below.
Feb 11, 2019
The most common causes of cracking are: Ground movement (beneath foundations) caused by clay shrinkage, land slip, vibration, subsidence, settlement, heave, sway, and so on. Foundation failure due to the decay of soft clay brick, concrete erosion due to chemical contaminants, and so on.
A: Wall cracks are fairly common in both new and older homes and are often the result of normal house “settling” that can quickly, inexpensively be remedied by re-taping the joints—the seams where the drywall panels meet.
If a crack is caused by subsidence, it will be: Thicker than a 10p coin (more than 3mm) Diagonal, and wider at the top than the bottom. Visible internally and externally.
Unfortunately, cracking in your walls and ceilings may also be the result of damage to your foundation. If you're seeing large cracks that are more than a quarter-inch wide or other signs that have you concerned about your foundation, it's definitely time to have your home checked.
Problematic wall cracks will typically start at windows, doorways or house corners. Generally, smaller hairline cracks are not cause for concern. These are usually the result of seasonal expansion and contraction of clay soils beneath your house over time, and can be easily patched and re-painted.
For deeper hairline cracks, you may want to use a filler to fill up the cracks before applying a new layer of paint in the affected area. However, if an extensive area has been affected, you will need to scrape off the paint and then sand the entire area to even out the edges before applying a fresh coat of paint.
The wood warms during the day, losing moisture and shrinking slightly. At night it cools, absorbing moisture and expanding a bit. As one piece of wood tries to move against another, pressure builds between the two. Finally the joint slips, causing the popping.
That loud popping noise you've noticed your house or deck making isn't a poltergeist or structural issue. Instead, it's the friction between your home's building materials as they contract and expand at different levels. Extreme cold air reduces the moisture content in the building materials, causing them to shrink.
One of the main causes of cracking and popping noises that seem to occur randomly in a house, mainly deep within the walls, floors, and ceilings, is known as thermal expansion.
These sounds are usually not something to worry about, but if it becomes constant or you notice an increase in sound, you may need to listen. Soil contracts and expands. When the weather is hot and without rain, the soil will dry up and contract. When it rains, the soil will absorb the water like a sponge, and expand.
The many materials that make up your house — wood framing, plywood, glass, metal ducts, nails, plumbing pipes — all expand and contract at different rates. When a house cools at night, these materials may move slightly, rubbing against each other and making noises. Occasionally, they'll contract with an audible pop.
A repetitive ticking or clicking sound coming from walls and ceilings can result from the expansion and contraction of metal HVAC ductwork that conducts ventilation through these voids. When metal heats up, it expands; when the furnace stops pushing warm air through the system, the metal cools and contracts.
Causes. The cause of phantom vibrations is not known. Preliminary research suggests it is related to over-involvement with one's cell phone. Vibrations typically begin occurring after carrying a phone for between one month and one year.
Ringing in your ears, or tinnitus, starts in your inner ear. Most often, it is caused by damage to or the loss of sensory hair cells in the cochlea, or the inner ear. Tinnitus can present in many different ways, including sounds related to the ocean, ringing, buzzing, clicking, hissing or whooshing.
11, 2016 -- An expert is warning about a modern-day phenomenon called phantom vibration syndrome, where people think their mobile phone is ringing or vibrating when it's not. Apparently some of us are so concerned about missing a call or text that we've become extra aware of the sensations that mean one is incoming.
All perception is made up of information from the world and biases we have adjusted from experience. Feeling a phantom phone vibration isn't some kind of pathological hallucination. It simply reflects our near-perfect perceptual systems trying their best in an uncertain and noisy world.