• Aggregates - cementorg

    Aggregates are inert granular materials such as sand, gravel, or crushed stone that, along with water and portland cement, are an essential ingredient in concrete For a good concrete mix, aggregates need to be clean, hard, strong particles free of absorbed chemicals or coatings of clay and other fine materials that could cause the .

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  • Patio Design: Understanding Crushed Stone | DoItYourself

    Patio design with crushed stone is easy, practical and more affordable than pavers or poured concrete It stays confined between borders, and resists sinking below ground Its shape creates a mosaic effect on your patio surface Crushed stone is any stone material, including granite, shale or slate .

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  • Why Should You Put Gravel Under a Deck? | Home Guides | SF ,

    Dec 17, 2018· Gravel serves the same function as pavers or a concrete pad in this type of application, but is much easier to install , "Why Should You Put Gravel Under a Deck?" Home Guides | SF Gate, .

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  • Key to a sound concrete slab is compact fill underneath ,

    Aug 07, 2015· DEAR TOM: Uncompacted fill under a concrete slab -- be it for an entire home, an exterior patio, a front porch or a driveway -- is a recipe for disaster

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  • compacting gravel under a slab - JLC-Online Forums

    Dec 07, 2004· Re: compacting gravel under a slab Tucker: With 2 to 3 feet of rock, I fail to see why you need either poly or insulation under the slab, I think I would opt for the "oozing" and the thickening effect of the "waffle" bottom, I would think that structurally it turns a 3 1/2" slab into something more like a 6 or 8" slab from a structural standpoint

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  • Crushed Stone Calculator: Free Online Tool

    See for yourself why a crushed stone calculator is so valuable, and how to use it properly Why do I need a crushed stone calculator? While there are specific mathematical calculations that can be performed in order to determine the quantity of crushed stone to purchase for a project, this may not be the ideal route for you

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  • Do I need crushed stone/gravel under my retaining wall ,

    Apr 22, 2008· Do I need crushed stone/gravel under my retaining wall? I am rebuilding a wall next to my driveway out of the home depot block rocks/retaining wail rocks The deal is, that the root system behind the wall has held it all together, so there won't be a lot of pressure How necessary is doing compacted stone/gravel, and how deep if I'm .

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  • Flagstone Patio on Crushed Stone - Ask the Builder

    They are a by-product of the rock-crushing process and are a very important component for the base material under your proposed patio If you were to use just crushed limestone with no fines, the flagstone would have a good base, but not the best The introduction of these fines is what allows the crushed limestone to mimic poured concrete

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  • Shouldn't I Have Gravel Under Concrete Footers? - Concrete ,

    Sep 29, 2012· Our contractor is telling me that a layer of gravel is not needed under the concrete footers I called the inspections office in my area and spoke to the lead inspector in my area and he told me the same thing, but couldn't tell me why gravel isn't needed under the poured concrete I called the inspector for a second opinion

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  • gravel under concrete slab? is it absolutely required ,

    gravel under concrete slab? is it absolutely required? Ask Question 4 so, I have a post-frame shed, 12x16 there are posts at 6' on the short sides and every 4' on the long side posts are set ~18" below grade, on a 2" cap of cement over a few inches of well compacted gravel, holes were all about 27" or so, 2x6 girder runs level at the top .

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  • Compact Fill Under Slab - Ask the Builder

    Compact Fill Under Slab - Concrete bends and breaks Use self-compacting fill Water helps compact Concrete block ledges on footer , The steel bars need to be placed so they line up with the concrete block pilasters , If you have to use crushed stone, be aware that it requires mechanical compaction so the pieces of gravel interlock .

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  • Why Put gravel under concrete? - Google Groups

    May 06, 2010· Why Put gravel under concrete? Showing 1-28 of 28 messag Why Put gravel under concrete? , to measure the amount needed), that I need to put gravel under the concrete WHY? I should mention that I always put lots of small to medium sized rocks under concrete to save on the amount of concrete needed , a Ready Mix truck tipped over and .

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  • Choosing Best Gravel For Concrete Pad - Concrete & Paving ,

    Jan 06, 2008· how do you choose? I've used pebble gravel (the rounded off gravel) which I would think provides the best drainage but also used a 5/7 gravel can 5/7 always be used or can crush and run be used in Choosing Best Gravel For Concrete Pad - Concrete & Paving - Contractor Talk

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  • Why do I need a Crushing and Screening Plant General ,

    Apr 20, 2017· This permit allows activity requiring crushed stone and/or the production of concrete Crushing and screening plants produce crushed stone Concrete batch plants can also be operated under this permit to produce concrete This permit covers the following types of equipment: crushers, screens, pugmills, silos, boilers, internal combustion engines, baghouses, storage bins.

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  • Ask the Builder | Concrete slab needs quality self ,

    What type of stone would be best for filling a cavity under a planned two-car garage addition? It is approximately 7 feet deep The local concrete supplier sells recycled concrete for a really .

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

    Apr 28, 2014· 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:

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  • Does anybody use sand as a base before they pour concrete ,

    Concrete cracks no matter what you do, that is why you see regular spaces groves or lines in sidewalks, its a control joint to allow cracking to occur there rather than where it wants Otherwise, what is under a slab depends on the ground you are pouring the slab on, some soils don't need anything, some need a ,

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  • How important is gravel under a concrete sidewalk? (Home ,

    How important is gravel under a concrete sidewalk? I got an estimate from a company on your list to replace my old, beat-up concrete sidewalk When they dug up the old sidewalk, there was no gravel underneath, and they wanted several hundred more dollars to dig out some of the dirt and put in a gravel bed - is this necessary?

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  • Why Put gravel under concrete? (2018 UPDATE)

    May 06, 2010· I have poured many small sidewalks and shed floors and never put gravel under the concrete I want to pour a driveway section in front of the garage and was told by a guy at the concrete company (who came to measure the amount needed), that I need to put gravel under the concrete

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  • Does anybody use sand as a base before they pour concrete ,

    Concrete cracks no matter what you do, that is why you see regular spaces groves or lines in sidewalks, its a control joint to allow cracking to occur there rather than where it wants Otherwise, what is under a slab depends on the ground you are pouring the slab on, some soils don't need anything, some need a ,

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  • Laying Pavers on Sand or Gravel (Paving Backyard with ,

    Sep 16, 2015· Laying Pavers on Sand or Gravel Paving a small backyard with DaznDi Properties In our new video I show how to lay concrete pavers in a small ,

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  • Compact Fill Under Slab - Ask the Builder

    Compact Fill Under Slab - Concrete bends and breaks Use self-compacting fill Water helps compact Concrete block ledges on footer , The steel bars need to be placed so they line up with the concrete block pilasters , If you have to use crushed stone, be aware that it requires mechanical compaction so the pieces of gravel interlock .

    Chat Now
  • Aggregates - cementorg

    Aggregates are inert granular materials such as sand, gravel, or crushed stone that, along with water and portland cement, are an essential ingredient in concrete For a good concrete mix, aggregates need to be clean, hard, strong particles free of absorbed chemicals or coatings of clay and other fine materials that could cause the .

    Chat Now
  • Sand under slab instead of gravel - GreenBuildingTalk ,

    Mar 04, 2013· I'd want to know why the sand is so wet in the first place If it's just due to weather exposure and would drain/dry if under cover, that's one thing If it's due to high water table, I might be inclined to build up the slab area with crushed stone (aka "gravel" in ,

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  • Concrete Slab - How to install a slab from start to finish

    It doesn't have a foundation or any concrete walls under it or around it In Maine we install a lot of slabs-on-grade for houses and garag , THE TOOLS YOU NEED TO BUILD A CONCRETE SLAB , Click on CONCRETE MIXING RATIOS to learn what the correct proportions of cement, sand, stone, and water are to mix your own concrete by hand

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