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Does anybody use sand as a base before they pour concrete

Does anybody use sand as a base before they pour concrete of a driveway? I was told by one of the contractor that I needed to put a layer of sand before I poured concrete for the driveway. Another contractor told me that no sand is used because it is the cause for cracks as the concrete moves. I am confused.

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why sand under concrete? Fine Homebuilding

Aug 19, 2004I’m preparing to pour a finish concrete foor, slab on grade. The structural plans call for 4″ compacted gravel base, insul-tarp vapor barrier, 2″ of sand and 4″ of concrete. What purpose other than a base for the concrete does the sand serve? Why use it when yopu have thick insul-tarp?

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Best practice for installing floor joists on slab for aMar 12, 2020Attaching en posts to a poured concrete slab FineApr 28, 2011hollow sounds under slab Fine HomebuildingNov 04, 2003pouring a cement slab in sections Fine HomebuildingSep 19, 2002查看更多结果

How to Prepare the Ground Before Pouring Concrete Slab

Do not leave any standing water and allow the dampened sand to dry for about an hour before pouring the concrete. Ground preparation is key to pouring sidewalk, driveway or any other concrete slab. Concrete is porous so you need to erect a concrete slab where drainage is

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Importance of Gravel and Sand for Concrete Hunker

Apr 12, 2018Concrete is made up of cement and water plus an aggregate composed of sand and gravel. The sand and gravel do more than act as filler, though. The size and amount of gravel added to a bag of concrete also determines the product's volume, strength, and durability.

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作者: Deborah Ng

The Recommended Gravel Base for a Concrete Driveway Home

The gravel base for a driveway should be a minimum of 4 inches deep. If heavier vehicles, such as large trucks, will use the driveway regularly, the

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SubgradesSubbases for Concrete Slabs The Concrete Network

What Is A Subbase/Subgrade?What About The Soil?Uniform SupportHow Does The Subgrade/Base Affect Slab Design?How Can We Improve The subgrade?Compaction EquipmentPlacing The ConcreteThe terminology used for soil support systems, unfortunately, is not completely consistent, so let's follow the American Concrete Institute's definitions, starting from the bottom: 1. Subgrade—this is the native soil (or improved soil), usually compacted 2. Subbase—this is a layer of gravel on top of the subgrade 3. Base (or base course)—this is the layer of material on top of the subbase and directly 在concretenetwork上查看更多信息

Concrete Sand vs. Mason Sand vs. White Sand

Take a few minutes to learn about the three most commonly used sand types; Concrete Sand vs. Mason Sand vs. White Sand. Concrete Sand. Concrete sand is and aggregate sand usually composed of either gneiss, trap rock, limestone or granite. This specific type of sand is normally crushed at the quarry and then washed and screened for quality.

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How to Pour a Concrete Sidewalk The Family Handyman

For a long-lasting sidewalk, plan on a 4-in. base of gravel under 4 in. of concrete. If you live in a frost-free climate with a natural sand base with good drainage, you can pour right on top of the sand. But other soil types will expand and contract with weather conditions and can crack overlying concrete.

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3 Reasons Why It's Important To Use Crushed Stone Under

Apr 28, 2014Concrete 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:

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gravel under concrete slab? is it absolutely required

If steel is called for, it should be rebars (not wire mesh) and spacers used. I live in a mild environment and we pour exterior unreinforced slabs about 15' x 15' before we start to using reinforcing. If we use reinforcing, then it needs to placed in the middle of the slab and meet the Pe ratio of steel to concrete, or it will crack anyway.

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How to Pack Down Rock Before Pouring Concrete Home

Dec 09, 2018How to Pack Down Rock Before Pouring Concrete. Whether you pour concrete for a walkway or patio, a strong gravel base is required to prevent the concrete from cracking and shifting. Gravel is

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What type of concrete foundation do you pour for sand

Compact sand (to say sand cannot be compacted is erroneous, it just doesn't require much) can be a very stable base. We have built many homes, cottages and garages on land that is sand for 10s of metres deep. Screw piles are one solution that works, but all that does is point load your home onto the piles, so you need a lot of them.

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How to Pour a Concrete Sidewalk The Family Handyman

For a long-lasting sidewalk, plan on a 4-in. base of gravel under 4 in. of concrete. If you live in a frost-free climate with a natural sand base with good drainage, you can pour right on top of the sand. But other soil types will expand and contract with weather conditions and can crack overlying concrete.

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Slab-on-Grade Vapor Barrier JLC-Online Forums

Feb 10, 2006Can anyone tell me definatively where the vapor barrier should go on a slab-on-grade installation. Before asking this I went through old threads/articles to first read how important a layer of sand or gravel between the VB and the bottom of the slab is, only to follow up with an article completely condemning this practice.

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Are Hardeners Effective?| Concrete Construction Magazine

Jan 09, 2014Concrete is hard, but not always hard enough. Some concrete floors wear out before their time. To make them last longer, the marketplace offers a wide range of products, including dry-shake hardeners, sealers, and concrete admixtures. But, a critical question: Do they work? The theory. Liquid hardeners are supposed to work like this: 1.

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What Happens When You Use More Than an Inch of Sand Under

Dec 29, 2018Before spreading any sand on your level sub-base, position two tubes within the excavated area so they are parallel to one another. Use the tubes' height as a gauge for the sand

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Curing Concrete Dos and Don'ts Bob Vila

If you expect to pour concrete and use it in a couple days, you can’t. When the temperatures drop, new concrete should be covered with concrete insulating blankets (or, in a

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Site Preparation: Making a proper bed for concrete

Feb 28, 2008There are organic soils too, but they aren't appropriate to use as a bedding material for concrete and should be removed (see Table 1). Coarse-grained soils include sand and larger aggregate particles, with sand sizes typically ranging from 0.003 to 0.08 inches in diameter and aggregates as large as 1½ inches.

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Do's and Don'ts of Paver Installation: Step 2 of 3 Base

The best way to prevent weeds is to use a good polymeric sand and ensure that it has filled joints to within 3 mm (⅛ inch) of the surface. If you are in an area that is all clay or other poor draining material, it is good practice to place a layer of geo-textile down first, then place your granular base.

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How to Properly Mix Concrete — The Family Handyman

Sixty- or 80-lb. bags of concrete mix are readily available at home centers, lumberyards and hardware stores. Don't confuse concrete mix with sand mix or mortar mix. They don't contain the aggregate (stones or gravel) that's necessary to make a pour thicker than about 3/4 in.

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How to Build a Concrete Base in Preparation for a Garage

Jan 13, 2020But, typically, the tamped base should be equal to your concrete's thickness (i.e. 4-inch base for 4-inch slab). Though, 6-inches of each is largely the new norm for vehicles in most areas now, with 4-inch only being for walkways, sidewalks, basements, patios, etc.

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Fill Dirt or Fill Sand: How to Pick the Right Material

The minute pieces of sand fit together nicely and create a firm surface. As discussed earlier, fill sand generally rates quite high for compaction, allowing for a firm and stable base. Sand can be displaced by outside forces, so it needs to be used in applications where it

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Don't Use Loose Sand Under Concrete Slabs| Concrete

Mar 01, 1999In addition, 1- and 2-inch sand layers were placed over a steel base and tested to show how the sand would affect subgrade support over a very stiff base. For all the soil samples tested, CBR values decreased dramatically when a thin layer of loose sand was placed over the compacted sample.

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11 Most Popular Shed Foundations (#3 is My Favorite)

Jun 16, 2020Use blocks or rebar rests to lift the rebar off the poly. You’re now ready to pour, screed, vibrate the perimeter, and finish the pad surface as desired smooth, glossy, or brushed. If attaching a sill plate, place anchor bolts every 4 feet around the perimeter before the concrete hardens (not in doorways). You may need expansion grooves

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Sand under slab instead of gravel GreenBuildingTalk

Mar 04, 2013Sand has a much higher capillary draw than gravel, and can seep intofill perforated drain pipes, etc. Directing roof drains well away from the house is the first line of defense, but I personally wouldn't feel right about not having perimeter drain at the footing as well, even with sand that seems to drain well on it's own.

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Do's and Don'ts of Paver Installation: Step 2 of 3 Base

The best way to prevent weeds is to use a good polymeric sand and ensure that it has filled joints to within 3 mm (⅛ inch) of the surface. If you are in an area that is all clay or other poor draining material, it is good practice to place a layer of geo-textile down first, then place your granular base.

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How to Properly Mix Concrete — The Family Handyman

Sixty- or 80-lb. bags of concrete mix are readily available at home centers, lumberyards and hardware stores. Don't confuse concrete mix with sand mix or mortar mix. They don't contain the aggregate (stones or gravel) that's necessary to make a pour thicker than about 3/4 in.

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How to lay a concrete slab Cement Australia

Before you get started. Use the Calculator to estimate how many 20kg bags you will need; Read the HintsTips section; If there is a specified concrete strength required for your project (i.e. N20/10) you must call in the professionals and have the concrete delivered via a truck its the only way to ensure a specified final strength of concrete.

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How to Pour a Concrete Slab for Beginners DIY YouTube

Jul 30, 2017In this video we show you how to pour your basic 16 x 12 Concrete Slab! We go over all the necessary steps for your concrete slab to come out perfect! We sho...

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作者: Odell Complete Concrete

Guide to laying a concrete slab Cockburn Cement

Do not add too much water, you do not want your mix too sloppy. Too much water means a weak concrete. The water should weigh roughly half of that of the cement added. A concrete mix of 1 part cement : 2 parts sand : 4 parts coarse aggregate should be used for a concrete slab. 4. Placing the Concrete. Concrete must be placed within half an hour

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Polyethylene Under Concrete Slabs GreenBuildingAdvisor

Jul 04, 2014For the concrete pouring thing, i use chairs on stairs, balconies or structural slabs never on basement slab, its useless, rebars or reinforcement mesh are only there as an attachment for the pipes, i ask concrete finishing team to slightly shake the pipes support to be sure that they are well coated with concrete.

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Help! 2 days before they pour Concrete Patio directly on

Jul 28, 2007My concrete contractor is constructing an 800 sq. ft. patio here in Utah. After removing the sod, and packing down the "fill" dirt from the original home construction (6 years old) with the skid steer, he said that they can pour directly on this surface. The picture is

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11 Most Popular Shed Foundations (#3 is My Favorite)

Jun 16, 2020Use blocks or rebar rests to lift the rebar off the poly. You’re now ready to pour, screed, vibrate the perimeter, and finish the pad surface as desired smooth, glossy, or brushed. If attaching a sill plate, place anchor bolts every 4 feet around the perimeter before the concrete hardens (not in doorways). You may need expansion grooves

get price

Fill Dirt or Fill Sand: How to Pick the Right Material

The minute pieces of sand fit together nicely and create a firm surface. As discussed earlier, fill sand generally rates quite high for compaction, allowing for a firm and stable base. Sand can be displaced by outside forces, so it needs to be used in applications where it

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DIY Weed Barrier Under Pavers Home Guides SF Gate

Dec 19, 2018DIY Weed Barrier Under Pavers. Pulling the weeds that have sneaked through the narrow spaces between your garden-path or patio pavers can give you a real pain in the neck. Several strategies will

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Pea gravel for interior floor slab support Geotechnical

Jun 06, 2006The cure for the situation is to use a well graded granular filter material instead of the single sized stuff. The US Army Corps of Engineers years ago found that the best filter material is ASTM-C-33 Fine agregate, (concrete sand). Cost is same as pea gravel and it really does

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Do I Need to Lay Gravel Before Pavers? Hunker

Repurposing a plain concrete slab as a foundation saves you the trouble of removing the concrete and results in a strong, long-lasting base. Check the condition of the concrete prior, and patch any pits or cracks. Set the pavers over a 1-inch layer of grit sand or 1/2 inch of mortar, and use edge restraints to secure them.

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Proper Subgrade Prep| Concrete Construction Magazine

Sep 20, 2007A flat, smooth surface is good for flatwork because the concrete can shrink as it cures without being restricted by the base material. Rammers, which work best for compacting 6 to 12 inches of fill, are designed to handle clay soils where the impact creates shearing forces that remove air voids from the clay.

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