· Chlorine. Salt Water Generator. SWG Type. Jandy Aquapure 1400. Aug 4, 2017. #1. I notice in a lot of the pics here there is a layer of gravel spread before the gunite is sprayed. Is this how it is supposed to be? Mine does not have a layer of gravel just the rebar, blocks to hold the rebar up 6" and the ground below it.
· So only Pea Gravel and Sand is a bad idea. If you have a lot of pea gravel I would say start with a 1:2:4 (cement: pea gravel : ballast) mix, noting that I said ballast not sand, as this will go in the hole first. And when Pea Gravel all used up move to the 1:6 (cement: ballast) mix that will then go on top. If you do use sand under patio, note ...
· Avon. Country: I am planning to lay a new concrete floor soon and getting really confused by what gravel I should buy. I am planning to mix it using cement, sharp sand and gravel (as opposed to using ballast) and already have the cement and sharp sand. I did get some 20mm gravel delivered but returned it as most of the gravel was larger than ...
Dana DeCecco Metal reinforcing bars, or rebar, may be used to strengthen concrete crawl spaces. The best materials for a crawl space floor are gravel, crushed stone or concrete, with the best of those choices being concrete. Concrete will keep out moisture and bugs.
Key points. • 'Aggregate' is a term for any particulate material. It includes gravel, crushed stone, sand, slag, recycled concrete and geosynthetic aggregates. Aggregate may be natural, manufactured or recycled. • Aggregates make up some 60 80% of the concrete mix. They provide compressive strength and bulk to concrete.
· So getting right to it then, what type of foundation are we going to build for our flagstone patio: sand, cement, or gravel? Short answer: well it depends. Quarry screenings are generally best for under the flagstones. Screenings are also one of the best options for in between the stones.
Mix ratio of sand and cement screed for floor varies based on the intended use of the screed. Added to that, cement type, grade of aggregate and the method of storage of screed material influence the mix ratio to a certain extent. Therefore, a suitable type of cement shall be selected, and sand needs to be free of deleterious materials.
You need gravel with sharp edges for friction so the gravel will not shift (in theory) when it is compacted. I would recommend going to your local rock quarry and get gravel that is no more than ″ in size. I recommend gravel grade #57 because it is easier to rake, but you could use #5, #57 or #67
Concrete is a mixture of cement, water, sand, gravel, crushed rock, or other aggregates. Sometimes one or more admixtures are added to change certain characteristics of the concrete, such as workability, durability, and time of hardening. The proportions of the components determine the concrete mix's compressive strength and durability.
· Put the pipes below the kingspan on top of the concrete slab. 2. Put them above the kingspan in the polypipe flexible conduit. 3. Below kingspan but still in flexible conduit. The 10mm pipes will be going back to a manifold which will be accessable under a existing wooden floor. Other advice greatly appreciated. TIA.
· Anyway the reason why you need to use it instead of gravel is that you need to compact it to give a firm base thus you need the pieces of all sizes inculding the fines (dust) to bond together when compacted with just gravel you won't get this bonding. Hope that answers it for you!!! Forum software strikes again!! LoL.
· Pea Gravel vs. Crushed Stone. It's pretty cut and dried. Pea gravel is used for drainage and Crushed Stone is used for support. Sit on any bean bag and the beans will displace themselves in the area of least resistance. Sit on a bag full of cubes and pyramids and you'll feel a little uncomfortable.
· Where pipework is installed under a suspended floor and is supported on ground or fill where movement is likely to occur, additional provisions may be required. See Clause Bricks, blocks or other hard material should not be used as temporary supports to achieve the correct gradients, as they may create hard spots which can distort the completed pipe run.
Aggregates for Concrete bination of gravels or crushed stone with particles predominantly larger than 5 mm ( in.) and generally between mm and mm (3⁄ 8 in. and 11⁄ 2 in.). Some natural aggregate deposits, called pitrun gravel, consist of gravel and sand that can be readily used in concrete after minimal processing. Natural ...
Soil Settles. If uncompacted, or poorly compacted, soil or fill sinks under a slab you end up with a hollow spot. If you drive on this concrete and apply pressure to it, the concrete tries to bend or stretch to conform to the hollow spot. The result is almost always a crack and the concrete slab drops down.
· I dont think you want the surface of your floor to blister and peel away. There's a lot of variables here, and in theory the vapor barriers sound good. But, check into it toroughly. Ive been doing concrete and been around concrete for a long time, and Ive never seen anyone put plastic under a garage slab around here.
· Its a real sun trap and in the summer it can get quite hot, due to both the exposed position and the ambient heat from the concrete, sheds and gravel. We have a chicken coop, which we have loed on the gravel underneath a large shady tree and we plan in install some raised planters throughout the area in order to grow some plants to produce more shade.
· Installing insulation prior to the pouring of a concrete slab floor improves the energy efficiency of the floor and makes it more comfortable. While you can apply insulation over the concrete slab, that requires adding wood subflooring and other components that .
gravel layer that served as a capillary break. Vapor barriers used were 4mil polyethylene and 55pound roofing felt. As Figure 1 shows, using a vapor barrier, with or without a gravel layer, lowered the amount of water passing through the slab from below. After 2 months of testing concrete with a watercement ratio of, moisture in
Note 4: The concrete outline dimensions and the reinforcing shown are for a foundation bed allowable bearing capacity of not less than 2,000 lb. / sq. ft. (1 ton per square foot). Many clays, and most all firm clay, hard clay, sand clay mixes, dry sands, coarse dry sands, dry sand and silt mixes, sand and gravel mixes, and gravel type soils meet or exceed this allowable bearing capacity.
Answer (1 of 4): Some information are lacking in this question. 1. You didn't state the mix ratio of the concrete; 2. You omitted the thickness of the floor. Assuming the mix ratio of the floor is 1:3:6 and the thickness of the floor is 150mm (1m by 1m by ). The wet volume of concrete to c...
· A.: Richard Meininger replied that there is no problem designing a concrete mixture with 3/8inch maximum size coarse aggregate (pea gravel or crushed stone) using the ACI 211 proportioning procedures for a concrete slab placed by pumping. But the concrete will shrink more than a No. 57 mixture, so control joints must be at a closer spacing ...
