• Recycled Concrete: The Pros and Cons Crushed Stone, Sand

    In today’s increasingly environmentally contentious world, just about anything can be recycled including construction materials. Recycled Concrete Aggregate (RCA) is one of the most commonly used recycled construction materials in NJ and its surrounding areas.. The material can be used for a wide range of practical purposes.

  • Potential Use of Crushed Concrete and Recycled Asphalt

    MSE walls with crushed concrete backfill should include adequate drains and high permittivity filter fabrics behind the wall to avoid drainage problems. 2. Concrete structures that have suffered sulfate attack cannot be crushed and used as backfill in MSE walls.

  • 210 Structure Backfill

    particles or sand-sized particles mixed with gravel, crushed gravel, or crushed stone. Do not use crushed concrete or reclaimed asphalt. (2) Ensure that the material provided has a liquid limit less than or equal to 25 and a plasticity index less than or equal to 6. The contractor may substitute type A for type B material. 210.2.2 Gradation

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  • Section 3010 Trench Excavation and Backfill

    2. Use only as topsoil outside of the pavement, unless otherwise specified or allowed by the Engineer. 3. Do not use in the pipe embedment zone. Table 3010.05: Class V Material Type Soil Group Symbol ASTM D 2487 Description Organic Soils (unsuitable for backfill) Organic clays of

  • Crushed concrete backfill Earthwork/grading engineering

    Jan 27, 2007· Clay backfill would be a no no in this instance as the walls aren't filled solid and I'm afraid the pressures would be too great. The slab will be 5"-6" thick and be reinforced to account for loads and the eventual settling of the fill below. The crushed concrete pieces are roughly golf ball to tennis ball in size and VERY VERY irregular in shape.

  • Crushed vs Round aggregate in concreteJan 31, 2012Crushed Concrete Density?Feb 26, 2009End Bearing Values for cast-in-place concrete piles in dense gravel??Apr 02, 2008Crushed concrete fill Foundation engineering See more results
  • backfill crushed concrete do not use

    aashto specifications for crushed stone as backfill materials. Section 209 Granular Backfill Wisconsin Department of . AASHTO 57 This material has a 1-1 2 inch top size and is a clean material Often used for backfill for retaining walls used for subase for sheds also sometimes used as driveway stone Also used as the primary raw aggregate in Ready Mixed Concrete and some Hot-Mixed Asphalt

  • Why & How to Use Recycled Crushed Concrete Superior

    Nov 07, 2019· US History of Using Crushed Concrete for Roadway and Driveway Construction. Since the 1940s, recycling concrete pavements (crushed concrete) has been a fairly common solution. The first instance in the US was following World War II. US Route 66 in Illinois needed to be expanded from two to four lanes. During this reconstruction project, the old

  • 209 Granular Backfill

    particles or sand-sized particles mixed with gravel, crushed gravel, or crushed stone. Do not use crushed concrete or reclaimed asphalt. (2) Ensure that the material provided has a liquid limit less than or equal to 25 and a plasticity index less than or equal to 6. The contractor may substitute grade 1 for grade 2 material. 209.2.2 Gradation

  • gravel under concrete slab? is it absolutely required

    We can use crushed stone as a capillary break if there are no fines in the crushed stones—but the stones don’t act as a vapor barrier. So it is common to use crushed stones with no fines as a capillary break—and then add a plastic sheet over the top of the stones in contact with the concrete as a

  • 02223 TRENCHING, BACKFILLING AND COMPACTING

    and concrete materials from the site to a legal disposal site. Do not use any broken asphalt or concrete for trench backfill. 3.4 DEWATERING A. Provide dewatering in accordance with the standard specifications. Maintain means and devices to remove and dispose of all water entering the trench

  • Crushed concrete fill Foundation engineering Eng-Tips

    Local availability and municipal standards typically govern the use of crushed concrete as a base material. I've worked with it as a slab base and as foundation backfill on a number of projects. I'm not sure about the alkali impact, but in structural terms, I've never had an issue with it. It compacts well in both wet and dry states.

  • Pros and Cons of backfilling foundation with gravel

    builder wants to backfill with the existing dirt from the excavation, but I told him to use gravel or crushed stone instead of the high clay content soil to better promote drainage. Are there any drawbacks in going the gravel route. I'm assuming the builder is just taking the cheapeast way out so he doesn't have to pay to haul away the

  • 209 Granular Backfill

    particles or sand-sized particles mixed with gravel, crushed gravel, or crushed stone. Do not use crushed concrete or reclaimed asphalt. (2) Ensure that the material provided has a liquid limit less than or equal to 25 and a plasticity index less than or equal to 6. The contractor may substitute grade 1 for grade 2 material. 209.2.2 Gradation

  • Sand Vs. Gravel to Backfill French Drains eHow

    The first back-fill should be washed, crushed rock or gravel that is 3/4 to 1 1/2 inch in diameter. Continue to fill the trench until a 12-inch depth remains from the rock up to the top of the trench. Overlap the filter fabric on top of the gravel. The remainder of the trench is then filled with the soil that was dug out when forming the trench.

  • gravel under concrete slab? is it absolutely required

    We can use crushed stone as a capillary break if there are no fines in the crushed stones—but the stones don’t act as a vapor barrier. So it is common to use crushed stones with no fines as a capillary break—and then add a plastic sheet over the top of the stones in contact with the concrete as a

  • 02223 TRENCHING, BACKFILLING AND COMPACTING

    and concrete materials from the site to a legal disposal site. Do not use any broken asphalt or concrete for trench backfill. 3.4 DEWATERING A. Provide dewatering in accordance with the standard specifications. Maintain means and devices to remove and dispose of all water entering the trench

  • Section 812 Backfill Materials

    Section 812—Backfill Materials Page 3 1 Crushed Stone Use a material manufactured from Class A or B stone free of soil overburden and having a soundness loss of not more than 15 percent. 2. Natural Sand Use material that consists of strong, hard, durable particles, is non-plastic, and has a durability index of at least 70. 3. Gradation

  • Why is gravel used as backfill for a retaining wall? Quora

    I imagine a common-sense answer would be that a suitably selected gravel would be a self compacting and free-draining backfill material, while retaining a high coefficient of friction (albeit with little cohesive properties). The free-draining pro.

  • Want to use crushed brick as a base for concrete patio

    May 01, 2012· Hi, I am currently in the middle of building my new home. The masons just finished and left me a yard full of broken bricks. I need to build a small 8x10 slab that ranges from 4 inched deep to 15 inches deep, (slope of the land) and I remember hearing that crushed brick is a good base for concrete.

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

    One reason it is used as a backfill or sub-grade material. As with all material, it has to be placed correctly and compacted properly. Sand needs to remain damp as well as other material before placement of the concrete. If you want to build a road, use gravel, but this does not mean you will not have issues.

  • gravel under concrete slab? is it absolutely required

    We can use crushed stone as a capillary break if there are no fines in the crushed stones—but the stones don’t act as a vapor barrier. So it is common to use crushed stones with no fines as a capillary break—and then add a plastic sheet over the top of the stones in contact with the concrete as a

  • Backfilling Foundation Wall ConstructionMentor.net

    Another consideration when backfilling and compacting a foundation wall is the strength of the wall itself. For a poured in place concrete foundation wall using standard 3000-4000psi concrete, one should typically wait at least 7 days (if not a full 28 days) for the concrete to cure before beginning backfill

  • 02223 TRENCHING, BACKFILLING AND COMPACTING

    and concrete materials from the site to a legal disposal site. Do not use any broken asphalt or concrete for trench backfill. 3.4 DEWATERING A. Provide dewatering in accordance with the standard specifications. Maintain means and devices to remove and dispose of all water entering the trench

  • Pros and Cons of backfilling foundation with gravel

    builder wants to backfill with the existing dirt from the excavation, but I told him to use gravel or crushed stone instead of the high clay content soil to better promote drainage. Are there any drawbacks in going the gravel route. I'm assuming the builder is just taking the cheapeast way out so he doesn't have to pay to haul away the

  • Backfill question Trouble Free Pool

    Aug 11, 2015· Is the road base product primarily crushed concrete? That's what I ended up using to backfill. It was $9.75/ton for 50 tons, which was about half the cost of anything else. It consists of a mix of particles from about 1" down to fine grains. It's very heavy and dense, making it

  • Want to use crushed brick as a base for concrete patio

    May 01, 2012· Hi, I am currently in the middle of building my new home. The masons just finished and left me a yard full of broken bricks. I need to build a small 8x10 slab that ranges from 4 inched deep to 15 inches deep, (slope of the land) and I remember hearing that crushed brick is a good base for concrete.

  • Should I set fence posts in dirt, gravel, crushed rock, or

    Mar 24, 2019· The answer depends on where you live. If you live someplace with heavy clay soil and a brutal freeze-thaw cycle, like I do, then pretty much everything is a better choice than concrete. Around here, the water is held against the post by the clay s.

  • Backfilling Your New Home Foundation. Quality

    Examples of organic material that will decompose include top soil, tree roots and stumps, scraps of wood,etc. By using fill dirt already on the lot, you can save a great deal of money. If there is not enough quality fill dirt on site, stone (or gravel) will most likely be trucked in and used when backfilling

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

    One reason it is used as a backfill or sub-grade material. As with all material, it has to be placed correctly and compacted properly. Sand needs to remain damp as well as other material before placement of the concrete. If you want to build a road, use gravel, but this does not mean you will not have issues.

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

    You should also keep in mind that fill dirt can absorb and retain moisture which means that it’s not always ideally suited for backfill projects around water sources. Fill Sand Benefits and Considerations. Fill sand is characterized by its extremely fine particle sizes. The minute pieces of sand fit together nicely and create a firm surface.

  • Concrete is a no-no for fence posts National Columns

    May 12, 2012· 5. Slowly shovel in equal parts crushed rock or sharp gravel and soil, tamping between layers, until you get to ground level. For years I’ve been using an oddly curved length of 2

  • Proper Subgrade Prep, Concrete Construction Magazine

    Sep 20, 2007· All too often, builders do not adequately prepare the subgrade for concrete foundations, sidewalks, driveways, or patios. The concrete contractor is responsible for ensuring that granular backfill receives proper compaction, density, and moisture levels prior to the placement of concrete.

  • State-of-the-Art Techniques for Backfilling Abandoned Mine

    sidence control and have been replaced with the use of pumped concrete forin-mine construction. Cribbingmade from timber or concrete blocks remains the onlytype of hand-constructed support used today. Inherent to remote backfill systems isthe problem of tracking the placement of the backfill

  • Sand versus Gravel Back Fill Dynasty Gunite & Fiberglass

    Clean crushed blue stone ¾” or smaller is the gravel used in our installations because it has several distinct advantages over sand or even round pea gravel. First, its properties do not change when it becomes saturated with water so it performs the same wet or dry.