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It depends. If the air and ground are warm, it might only be 2 or 3 hours before the forms are stripped. If a high-early-strength admixture is in the concrete mix, the forms could likely be remove at around an hour after placing it. This could result in stress cracks in the placed concrete, however.
On the other hand, forms hold water inside the concrete where it is critically needed for the mix to cure and harden. If forms are stripped in the first 3 days or so since placing the concrete mix, then other means must be used to keep the water in the mix. A spray coat of latex liquid (Curing compound) can do it. A sprinkler running 24 hours per day can do it (This is the best way), or a covering of plastic sheeting can do it. Some people still use large burlap blankets soaked in water to cover the concrete.
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What does the s mean in concrete?
The 's' stands for 'slump'. How wet the concrete is. S1 is prity dry (for laying kerb stones). S2 is wet (for foundations). S3 is very wet (pump mixes). Regards Colin, a Tarmac concrete batcher. 2nd Answer: It should be noted that the concrete should be as dry as practical to enable it to attain the highest potential strength. Concrete should never be so wet that it flows into the forms like tomato soup. In foundations in particular, you want the best strength you can get, as the entire structure will apply force to them. It should take some handwork with shovels to "ker-chunk" the concrete into the nooks and crannies of the forms. For vertical forms, using a 'stinger' or vibratory device is preferred to settle the concrete into all the nooks and crannies. A 4" slump is about as wet as you want the concrete mix to be. If you pick up a handful (with gloves) of fresh concrete and mold it into a fat cigar shape, it should hold that shape when you open your fingers. When the concrete mix comes down the chute of the delivery truck, it should stand up on the ground in a little hill, but with some spreading out, too. For all but the dry structural concretes, you can increase the fresh concrete's slump (wetter) by adding 1 gallon of water for each cubic yard of concrete for each additional inch of slump desired.
Can you build an addition with a crawlspace over a concrete driveway?
It is possible to but an addition with a crawl space over a driveway. However, the concrete will need to be broken up and removed first.
What is concrete shuttering?
A wooded frame is made into a shape, for example a stair case, and then the concrete is poured into the frame. After the concrete has set, the wood/shuttering is removed, leaving a solid concrete shape. Steel bars are added into the concrete as it sets to give the shape more strength. Vague description but that the general idea of it, hope it helped.
Prior to placing concrete whatshould you accomplish?
take a few minutes to ensure forms are clean tight and braced
What is temperature of concrete pouring at site?
Temprature of concrete while pouring at site should be in the range 23 to 28 degree C.
How are forms built for concrete?
All forms should be well constructed.All forms should be carefully aligned.It should be subtle and firm.All forms should be securely braced and fastened together in their final position.
How long should wood forms stay on concrete?
overnight till it sets
How do you remove scratches from concrete?
Scratches can be removed from concrete by sanding them. They can also be removed by applying a thin scratch coat.
Can bottom forms be remove if strength required is attained in 7 days?
In reference to concrete, bottom forms can be removed once the item is dried and set. After 7 days, strength is built in the product and it is able to be used without bottom support forms.
What is a construction former?
This term may be referring to a carpenter who "forms" concrete. That is setting forms to place concrete into for walls, floors, footings and such.
Can plywood be used for concrete forms?
Plywood would be very ideal for concrete forms given its ability to produce smooth surfaces and to be used repeatedly.
What does the s mean in concrete?
The 's' stands for 'slump'. How wet the concrete is. S1 is prity dry (for laying kerb stones). S2 is wet (for foundations). S3 is very wet (pump mixes). Regards Colin, a Tarmac concrete batcher. 2nd Answer: It should be noted that the concrete should be as dry as practical to enable it to attain the highest potential strength. Concrete should never be so wet that it flows into the forms like tomato soup. In foundations in particular, you want the best strength you can get, as the entire structure will apply force to them. It should take some handwork with shovels to "ker-chunk" the concrete into the nooks and crannies of the forms. For vertical forms, using a 'stinger' or vibratory device is preferred to settle the concrete into all the nooks and crannies. A 4" slump is about as wet as you want the concrete mix to be. If you pick up a handful (with gloves) of fresh concrete and mold it into a fat cigar shape, it should hold that shape when you open your fingers. When the concrete mix comes down the chute of the delivery truck, it should stand up on the ground in a little hill, but with some spreading out, too. For all but the dry structural concretes, you can increase the fresh concrete's slump (wetter) by adding 1 gallon of water for each cubic yard of concrete for each additional inch of slump desired.
Does concrete paint need to be removed from concrete before installing self adhesve tile?
No, it's okay to leave on.
What statement best defines concrete consolidation?
a process of compacting and molding fresh concrete within the forms
What services does Concrete Work provide?
Concrete Works provides insulated concrete forms, traditional concrete foundations, test pits and evaluations. They also do septic system repair and installation.
How long should a concrete pad cure before removing forms?
Most of the time it comes off the next day. Some will strip it the same day. I just think that is too soon. Can depend on the mix design of the concrete and what type of cement is used. Can range from 5min to days. Concrete at precast plants that make sewer structures will remove the forms 5min after because of the mix design (0 slump / rapid setting / high strength gain). Bridge girders will be striped 12 - 24 hours after concrete has been placed (high early strength gain cement). Other form work in construction is based of cement type used in the mix design of the concrete or contractors decisions (1 or more days).
What type of concrete should you use when making a concrete bench?
The best concrete for making a concrete bench is Bench concrete.
