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Gas (air) trapped in the mixture was not removed. The bubbles make the holes.
One method to reduce the holes and get a smooth finish when the formwork is removed, is to use a concrete vibrator. This tool is poked into the wet concrete before it sets and vibrates the mix to encourage air to come to the surface. It can be very effective. This also makes the concrete stronger by eliminating weaknesses caused by air pockets.
Concrete vibrators must be used carefully and should not be allowed to contact the formwork or reinforcing as they can mark the surface and move the reinforcing. Excessive use can also separate the fines and the coarse aggregate making the concrete weaker.
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∙ 14y ago
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Are concrete blocks cheaper then a concrete slab?
That's sort of a strange question. A concrete slab is a horizontal surface -- it's meant to be a surface you stand on or build things on. Concrete blocks are usually used for vertical surfaces -- walls. I believe that poured concrete walls are more expensive than concrete block walls. You wouldn't use concrete blocks as a substitute for a concrete slab.
Are poured concrete walls better than concrete block walls?
It depends on the application. For homes, masonry is fine as long as it is insulated well against the weather. Masonry rarely needs maintenance. Concrete walls are stronger and last longer than masonry but are more costly to construct. For basement walls, I suggest that you always use concrete walls. Above ground level, masonry is cheaper and strong enough for residential and commercial, multi-story applications. For retaining walls, 8" thick masonry works well up to about 8 feet of retained earth. Above that, the lower courses of block will get thicker to 12". You still need concrete footings for block walls.
What can you do with concrete?
With concrete and precast concrete you can build fences, walls, concrete sound walls, pre-cast concrete perimeter walls, masonry walls, masonry screen walls and more! If you are interested in having a concrete or precast fence, perimeter, sound wall, masonry wall or masonry screen wall, then go to the links below for more information. Well you can make walls, houses, bricks and so on.
What is a monolithic concrete slab?
is it a footer that is poured the same time as the slab?
How much does it cost for poured concrete?
8 dollars per acre
What are rat walls?
Concrete poured around a foundation.
Are concrete blocks cheaper then a concrete slab?
That's sort of a strange question. A concrete slab is a horizontal surface -- it's meant to be a surface you stand on or build things on. Concrete blocks are usually used for vertical surfaces -- walls. I believe that poured concrete walls are more expensive than concrete block walls. You wouldn't use concrete blocks as a substitute for a concrete slab.
What is the subject and prediceatice of the workers poured more concrete?
"Prediceatice" is not a word, so this answer assumes you meant "predicate". The subject of "The workers poured more concrete" is "workers", and the predicate (verb) is "poured". "Concrete" is the direct object.
Are poured concrete walls better than concrete block walls?
It depends on the application. For homes, masonry is fine as long as it is insulated well against the weather. Masonry rarely needs maintenance. Concrete walls are stronger and last longer than masonry but are more costly to construct. For basement walls, I suggest that you always use concrete walls. Above ground level, masonry is cheaper and strong enough for residential and commercial, multi-story applications. For retaining walls, 8" thick masonry works well up to about 8 feet of retained earth. Above that, the lower courses of block will get thicker to 12". You still need concrete footings for block walls.
1 What does it means SITU concrete Construction?
insitu concrete is any concrete structure that is poured in its desired finished place. ie floor slabs of buildings because they are poured and never moved
When concrete is poured around steel bars what kind of a material does it form?
reenforced concrete
What can you do with concrete?
With concrete and precast concrete you can build fences, walls, concrete sound walls, pre-cast concrete perimeter walls, masonry walls, masonry screen walls and more! If you are interested in having a concrete or precast fence, perimeter, sound wall, masonry wall or masonry screen wall, then go to the links below for more information. Well you can make walls, houses, bricks and so on.
Will fertilizer hurt unsealed concrete?
Unsealed concrete is porous and soaks in everything that is poured on it. Fertilizer will sock into the concrete.
Concrete Foundation Installation?
form_title=Concrete Foundation Installation form_header=7683 Have there been any completed structural drawings for this project?*= () Yes () No Which kind of concrete foundation would you like?*= () Poured concrete slab foundation () Concrete pier foundation () Poured concrete basement () Concrete block foundation () Poured concrete foundation with crawlspace () Want recommendation Please specify what the purpose of the foundation is.*= () Foundation for a new home () Foundation for a mobile home () Existing foundation is beyond repair () Foundation for addition or small structure
What was boiled in vats and poured over castle walls?
Oil.
Are poured or block basement walls easier to finish?
Masons tipsI have had better luck with the poured ones afetr the forms have been taken off. Making sure as the concrete is poured/pumped into the wasll to use a concrete vibrater to remove air which will result in hollow spots and cracking.You can finish the walls easily with Grout,cement,or a type of mortar that has less shrinkagee but this type hardens quickly, so have your mason ready with sponge floats /hand floats,Masons hammer,protective gear for eyes, hands,rubber boots, to prevent exsposure to the wet cement that will cause a chemical burn.
How do you fill in concrete holes or cracks?
With a concrete crack filler
