Why do concrete walls have holes in them?

These holes are caused by bars that are put through the frame before the concrete is poured and then clamped, so the mold can't swell outward.

What are the round holes in concrete?

Mudjacking, sometimes called slabjacking or pressure grouting, is the lifting of a concrete slab or foundation, usually slabs, by pumping a concrete grout slurry under high pressure, beneath the existing concrete. Evidence of mudjacking is usually a group of holes around 1 5/8 inch to 2 inches in diameter.

Why are there holes drilled in my foundation?

What Are Weep Holes? Weep holes are tiny openings that allow water to drain from within your foundation walls. They're usually drilled into the base of foundation walls to allow moisture to escape. Whenever water gets into the foundation, it will drip down the back of the wall and pass through the weep holes.

What causes tiny holes in walls?

When insects like termites, wood wasps, or powder post beetles get into a home, they can leave tiny holes the size of pinholes in drywall. Reinforcing drywall with materials that deter bugs, sealing up any cracks, and reducing moisture help.

How do holes get in concrete?

The lignite or shale particles are lightweight and float near the surface of the slab when the concrete is installed and troweled. These particles are very absorbent. When water penetrates and freezes, these particles expand more than water and pushes the top off of the concrete creating a small hole.

why do we provide holes in concrete block ?

Why do they drill holes in the sidewalk?

Remember, the whole reason for mudjacking the concrete sidewalk is to solve an unsightly out of level surface. These large holes solve one unsightly issue with another.

Why are there slits in the road?

Potholes are holes in the roadway that vary in size and shape. They are caused by the expansion and contraction of ground water after the water has entered into the ground under the pavement.

Is it OK to drill into foundation?

You can, in fact, drill a hole in a concrete interior feature wall armed with nothing more than your trusty rotary drill and a masonry bit—so long as you take care to not burn out the motor of the drill or demolish the bits.

Can you screw directly into concrete?

Concrete screws are a quick and convenient way to fasten to concrete. The best thing about these screws is that you can screw directly into concrete without any need for hammering or an anchor or shield to install. All you have to do is drill a hole and drive in the screw.

What causes small holes in concrete floor?

The most common causes for surface voids are entrapped air, the improper use of release agents or excess water within the concrete mix. Air can create blowholes and air bubbles in the concrete when air becomes trapped within the concrete mix.

What are voids in concrete?

Answer: Surface voids are the cavities or little holes that appear on the surface of concrete castings. Surface voids (commonly known as pitting) are referred to as "bug holes" or "fish eyes". These voids may produce an unacceptable appearance on the surface of the finished casting.

What does spalling concrete look like?

Spalling concrete can look like round or oval depressions along surfaces or joints. Spalling tends to be most common in cold climates when de-icing chemicals are applied or when seasonal freeze-thaw cycles damage the concrete.

What insect makes holes in walls?

Holes and cavities within walls can indicate the presence of termites. Walls are particularly susceptible to termite damage for a number of reasons: they are accessible from the ground, and their surface area is considerable.

How do you tell if termites are in your walls?

Do termites make holes in walls?

Sometimes termites make small holes in the drywall paper. Subterranean termites use soil to fill these holes, drywood termites do not. If you notice small pin-sized holes in sheetrock (also spelled sheet rock) or wallpaper, schedule a termite inspection before moving forward with any repairs.

How do you tell if there is a void under concrete?

To detect voids under concrete, mudjacking contractors use a high-frequency, ground penetrating radar system. The GPR equipment sends a radio pulse down into the ground. When the transmission reaches an anomaly in the soil, a reflected signal is sent to the receiver.

What is Honeycombing in concrete?

Honeycombing is the term used to describe areas of the surface that are coarse and stony. It may be caused by insufficient fine material in the mix, perhaps due to incorrect aggregate grading or poor mixing.

What causes blistering in concrete?

Blisters form on fresh concrete when the surface becomes prematurely sealed as it dries, causing bubbles of air or bleed water to get trapped just beneath the surface. Concrete blisters are not easily repaired after the concrete hardens. There are some elements to control to minimize the chance of concrete blistering.

How do you prevent pinholes in concrete?

Lower the viscosity of cement by adding sand or fly ash. This allows large aggregate to move more freely and reduces the amount of air entrapment. Use aggregate that is more uniform in shape. Irregular shaped pieces of aggregate tend to make the concrete less fluid.

What is the black stuff between concrete slabs?

An expansion joint is a material placed in the cracks (or joints) between concrete slabs to protect the slabs from cracking when they contract and expand as the temperature changes. This material acts as a shock absorber, absorbing the stress from the slab's movement.

What do concrete screws look like?

Concrete screws, commonly known by the tradename Tapcon, look like wood screws, but feature high–low threads that bite tightly to the sides of the hole.

How do you attach a concrete wall without drilling?

Mounting putty is a sticky, clay-like material that comes in sticks or cubes. It's rolled into balls by hand and used as a substitute for pushpins or tacks. Mounting putty is especially good for cinder block walls, because it is thick enough to fill in cinder block's bumpy surface.