can you use 3 4 inch rock without fines under concrete slab

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Proper Subgrade Prep Concrete Construction Magazine - Know More

Sep 20, 2007 0183 32 Proper subgrade compaction reduces concrete failure concerns By Tim Gregorski Joe Nasvik Concrete slabs perform best when they are even thickness The worker shown here is using a 2x4 to strike flat subgrade Drylines serve as a guide to ensure that the subgrade has proper elevation When it comes to compacting a subgrade for a residential ....

Decorative Concrete Overlay Flooring Options - Know More

May 20, 2020 0183 32 Absolutely With stampable overlays, which are typically applied at a thickness of up to 3/4 inch, you can use the same stamping mats and texturing skins used for traditional stamped concrete to produce patterns and textures that mimic stone, brick, slate, and other materials Texturing skins produce a seamless texture with no grout lines while ....

Readers ask How To Lay Concrete Slabs For Patio? - Know More

Jul 02, 2021 0183 32 3 Mortar preparation Lay the paving slabs on a full mortar bed, which should support the whole slab, not just the corners Use a mortar mix of 6 parts sharp sand to 1 part cement Mix together with just enough water to make it ,...

How do you prepare ground for concrete? - Know More

Rebar Basics For concrete patios, use 3 rebar These bars have a 3/8-inch diameter The soil under the patio will provide most of the necessary support for the concrete The rebar installed is intended to minimize cracks caused by the concrete shrinking and swelling depending on the temperature and weather conditions...

gravel under concrete slab? is it absolutely required , - Know More

May 02, 2017 0183 32 Its about 375 cu yards of crete, or like 400 It will cost 100 for gravel to fill in 2 , but my crete is still only a little cheaper, and it will be a thinner slab I could put gravel in, say 2 and 35 of concrete over that or just full 55 of crete or I could do lot of gravel and a 2 top coat over that with a bunch of steel and fibers....

Aggregates for Use In Concrete - Know More

Source Table 1 Limits for Deleterious Substances in Fine Aggregate for Concrete, ASTM C 33 In the case of manufactured sand, if the material finer than the 75-micron No 200 sieve consists of the dust or fracture, essentially free of clay or shale, ,...

How to Pack Down Rock Before Pouring Concrete Home , - Know More

Dec 09, 2018 0183 32 Form boards can be 2-by-4-inch wood boards or flexible hardboard secured to wooden stakes form boards are necessary to hold wet concrete in place until it cur Spread a level, 2-inch layer of 3 ....

Don t get over charged Here s my concrete slab cost in detail - Know More

So a 32 x 24 x 6 thick concrete slab would cost 460800 Included in my concrete slab price 1 3000 PSI CONCRETE WITH 3/4 INCH CRUSHED STONE 2 6 INCH THICK CONCRETE 3 FIBERMESH IN THE CONCRETE FOR REINFORCEMENT 4 A DOUBLE ROW OF 1/2 REBAR AROUND THE EDGES 5 LABOR TO FORM THE EDGES WITH 2x6 S 6...

Aggregate placement under foundations - Know More

May 21, 2019 0183 32 Crushed stone is the only type of uniformly graded gravel that I ve used under slabs and footings You can definitely compact 12-inches of crushed 3/8-inch or 3/4-inch stone and see the lift densify as the angular stones lock into each other We ve used it on parking structures, hospitals, libraries, and other heavily loaded buildings and slabs...

Can gravel be used as a sub base? - Know More

Mar 29, 2020 0183 32 The depth of the gravel can vary, but should be at least 4 to 6 inch To determine this measurement in feet, divide the number of inches by 12 for example, 6 inches is 05 feet If you plan to do two to three layers, each layer will need to be 4 to 6 inches thick, so you will to calculate each layer separately...

Aggregates for Concrete - Know More

AGGREGATES FOR CONCRETE E1-3 sieve and predominantly retained on the 75 181 m No 200 sieve is called fine aggregate or sand, and larger aggregate is called coarse aggregate Coarse aggregate may be available in several different size groups, such as 19 to 475 mm 3/4 in to No 4 , or 375 to 19 mm 1-1/2 to 3/4 in...

What size gravel is best for walkway? - Know More

Oct 04, 2021 0183 32 You will need 3 inches of gravel under a concrete slab that is 4 inches thick More gravel is better, but 3 inches is the minimum amount of gravel you should have with a 4 slab Use 190 washed and screened gravel, then compact it to level...

compacting gravel /crushed rock fill - Know More

Apr 26, 2011 0183 32 Probably self compacting 57, which is 1/2 to 3/4-inch gravel is generally considered to be self compacting This is because there are no fines to inerfer with the movement, so it goes to where there is direct contact between the particl Short of braking the rocks, which would require a great deal of force, the material won t get any tighter...

flagstone patio on sand - Know More

Once you have determined the finish height of the patio, you need to excavate soil so that you can install a 4-inch thick concrete slab, 3/4 inch thick setting bed of cement mortar and the actual flagston Many flagstones are commonly 3/4 inch thick so I ,...

Subgrades Subbases for Concrete Slabs - Know More

Clay that you can push your thumb a few inches into with moderate effort has a bearing strength in the range of 1000 to 2500 psf Loose sand that you can just barely push a 4 rebar into by hand has a bearing capacity of 1000 to 3000 psf Sand that you can drive a 4 rebar into about 1 foot with a 5-pound hammer has a bearing capacity over 2000 psf...

Resurfacing Concrete - Know More

The size of stone in concrete mixes is very critical 1/3 Rule The maximum diameter of any stone in a concrete mix should never exceed 1/3 the thickness of the pour Small pea gravel often has stones larger than 1/4 inch in diameter, thus it can only ,...

What should I put under my pavers? - Know More

If you use pea gravel beneath a patio, take a few simple steps to ensure the stability of the base before setting your surface stones, pavers or bricks What kind of gravel do you use under pavers? Crushed Stone Stone aggregate comes in a variety of sizes, but most experts recommend 3/4-inch gravel for paver bas...

Select Sand Gravel - Know More

Aug 21, 2017 0183 32 That material must have both crushed rock of at least 3/8 in size going all the way down to the crusher fines, which is the rock dust that is produced when the material is crushed you might ask, why would one want rock dust in your driveway? Well, it can be messy at first but without the dust the roadbase has no way to bind together...

Can you pour concrete over rocks? - Know More

Mar 28, 2020 0183 32 If you don t put rebars in a 4-inch 10 CM slab, then it won t be reinforced concrete - and won t perform As a general rule, any section of concrete must have at least 025 of its area in rebars to be considered reinforced concrete and do the intended job...

Do You Need Gravel Under Concrete Patio, Slab, Footings? - Know More

You will need 3 inches of gravel under a concrete slab that is 4 inches thick More gravel is better, but 3 inches is the minimum amount of gravel you should have with a 4 slab Use 190 washed and screened gravel, then compact it to level...

3 Reasons Why It s Important To Use Crushed Stone Under , - Know More

Apr 28, 2014 0183 32 Concrete may seem strong, but after many years, elements, and pressure, it will eventually crack So in order to make your concrete last as long as your money that went into it, adding a layer of crushed stone under a slab of concrete will increase the life of your investment Here are 3 reasons why a layer of crushed stone is important to the life of your concrete...

How much weight can a 4 - Know More

Answer 1 of 4 For a given slab thickness, strength depends on The mix of concrete used- ratio of cement to sand to gravel, size of gravel, and any additives Reinforcement- re-enforced concrete is stronger The foundations- clearly a slab poured onto solid rock just to create a ,...

What Type Of Gravel Under Concrete Slab - Know More

Concrete floor problems building science corporation build a concrete slab extreme how to concrete floor problems building science corporation view of a the concrete slab over vault edge beams and b 3 reasons to use crushed stone under concrete slabs b r sand gravel vs concrete shed base which is a better choice...

How to lift/raise/repair a segment of concrete slab? - Know More

Mar 05, 2019 0183 32 From the lawn side, trench along the slab about 6 wide and to the bottom of the concrete Save the sod by wrapping it in a tarp Using heavy steel or wood bars and some fulcrum blocks, begin lifting the concrete Work in stages and block it up as you go Once you re high enough, move the blocks rearward, underneath the slab...

What size crushed stone for concrete slab? - Know More

Jun 22, 2020 0183 32 If you don t put rebars in a 4-inch 10 CM slab, then it won t be reinforced concrete - and won t perform As a general rule, any section of concrete must have at least 025 of its area in rebars to be considered reinforced concrete and do the intended job...

Pouring Finishing Concrete Slabs QUIKRETE Cement and , - Know More

Excavate the slab area to a depth of about 7 inches, allowing 3 inches for a gravel base and 4 inches for concrete Step 2 Check the forms for level 188 inch for every 12 feet is sufficient to allow for rain run-off Patio and sidewalk forms should slope evenly away from structur Step 3...

CONCRETE PIPE BOX CULVERT INSTALLATION - Know More

The use of mechanical equipment is necessary for unloading arch, elliptical and box sections and larger size circular pipe, and can usually simplify and speed up the unloading of smaller pipe When using mechanical equipment for unloading, the lifting device, which connects to the pipe, should enable proper and safe handling without damage...

only sand for the base of paver patio? - Know More

I would never use 3/4 minus again The fines mean 1 the base doesn t drain as well 2 the fines can wash out 3 fines turn mushy when saturated For me, its 1 woven geotextile 2 limestone without fines 3 woven geotextile 4 oourse sand 5 pavers 6 polymeric sand ,...

Gravel under concrete footing - Know More

Apr 01, 2015 0183 32 Crusher-run gravel compacts well but does not drain very fast -- at least not as fast as 3/4-inch crushed stone no fines Talk to a soils engineer if you are worried -- but in my experience, either crusher-run gravel compacted or 3/4-inch crushed stone can be used under footings So can rigid An engineer may disagree...

Installing a Hardwood Floor Over a Concrete Slab , - Know More

Polyethylene Cover the entire slab with 4 to 6 mil polyethylene film, overlapping the edges 4 to 6 , and allowing enough film to extend under the baseboard on all sid When moisture conditions are more severe, prime the slab and apply cold, cut-back mastic with a straightedge or fine-tooth trowel 100 sq ft per gallon...