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In the overall, can you over vibrating concrete?
Yes, concrete can be over vibrated. If the vibrator is left in the concrete for too long, a thick film of water will be on the concrete layer and the cement will tend to sink. This results in a lower strength at the surface of the concrete.
Over and above, how deep does a concrete slab have to be? 4 inches
One way or another, how long is ready mix concrete workable?
What does vibration do to concrete?
Why is it Important? Vibrating concrete is critical because by removing air pockets & packing the aggregate particles together, it increases the density and strength of the concrete. Tightly packed particles will result in a stronger, more durable concrete structure.
10 Related Questions Answered
Vibrating is a critical step on many concrete construction projects. When concrete is poured, it might have hundreds or even thousands of air bubbles, which can substantially weaken the concrete structure. Concrete vibrators eliminate air bubbles by vigorously shaking the freshly poured concrete.
Four inches is the general rule for residential areas, and it can hold several regular-sized cars without the homeowner having to worry about cracking.
If done properly, new concrete can often be poured right over an existing slab. For this to be feasible, the contractor needs to pour at least 2 inches thick, use smaller aggregate, and incorporate reinforcement such as welded wire mesh or fiber mixed into the concrete.
For a 10 x 10 slab, you would need 77 60-pound bags or 60 80-pound bags. If we add an extra 10%, that's an extra 8 60-pound bags or 6 80-pound bags.
Pouring concrete in the rain can compromise its strength, increasing the tendency for dusting and scaling to develop. Once the damage is done, it can be hard to rectify and will often ruin the appearance of the finished surface. Don't let it rain on your parade.
In order to keep your new slab of concrete at an acceptable temperature, usually between 50 and 85 degrees F, and at an acceptable moisture level, which varies, you'll need to use the three phases of curing. Starting immediately after pouring the slab, watch the bleed water that rises to the top of your concrete.
five to 10 times per day
Concrete @ your Fingertips 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.
As the concrete heats up, the air forces itself through the membrane or coating causing the pinhole. Aggregate: The aggregate used within the concrete mix design may also lend to pinholes. Some aggregates retain moisture at a higher concentration thus leading to outgassing as the concrete heats up.
ANSWER: Keeping concrete moist helps the curing process. Concrete hardens as a result of a chemical reaction, called hydration, between cement and water, not because it dries. ... If too much water is lost from the concrete through evaporation, the hardening process slows down or ceases.