Concrete strength also comes into play, but most slab concrete is around 3000 to 4000 psi, so it's not a major factor. The tensile strength of concrete is typically taken as 10 to 15% of the compressive strength, so only about 400 or 500 psi. Compare that to the tensile strength of Grade 60 rebar, which is 60,000 psi.
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Using Broken Concrete as fill. I have a customer who has an old garage slab that he wants to remove. He also has an area of his yard that will require fill in order to make it level. He wants to break up the concrete and use it as fill in the low area. He may have to excavate an area to bury the concrete. How much soil would be required over ...
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This implies they can be easily reused with little environmental consequence. The exposure of crushed Recycled Concrete Material (RCM), however, will lead to production of a highly alkaline (pH …
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Backfill with a mix of soil and sharp gravel, and keep tamping it down with something long and thin. When you reach the top of the hole, shovel a good amount of the mix around the base of the post, forming a mound that lets water run down. Repeat, for every single post. Dirt-setting fence posts is a great workout.
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Recycling concrete consists of breaking, removing, and crushing concrete from an existing location, and then using it to create a new, reusable material. There are many benefits …
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Some of the most commonly available recycled materials are crushed concrete (CC) and RAP, and these materials are being considered for use as backfill in MSE walls in Texas (Rathje, et al. 2006). ...
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Recycling of Concrete • Aggregate in concrete comprise about –80 to 85 percent of the mix by mass –60 to 75 percent of the mix by volume • Recycled concrete aggregate (RCA) –Crushed aggregate from existing concrete –Consists of high-quality, well-graded aggregates (usually mineral aggregates), bonded by a hardened cementitious paste 6
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The crushed stone should be placed in 2 to 4-inch-thick layers and compacted with a hand tamper or plate compactor. ... This process usually takes 5-7 days after pouring the concrete. The backfill process helps to ensure that your property has a sturdy foundation by filling in any voids around the perimeter of the foundation.
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A series of consolidated drained triaxial compression (TC) tests were performed on a crushed concrete aggregate (CCA) compacted using three different levels of energy. A wide range of moulding water … Expand
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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
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If you use concrete it's still the dirt around the concrete that supports the fence; you have just added 30 pounds of concrete to the bottom of it. ... Place your post in the hole and backfill with dirt. Share. Improve this …
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Recycled concrete aggregate (RCA) refers to crushed concrete and other materials suitable for use as fill and compactible fill. Initiatives to use CCA in concrete mixes have proceeded slowly and cautiously for many reasons. A central concern is whether CCA can have the same quality as materials—a pile of demolished …
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Considering its eco-friendliness, crushed concrete is a popular landscaping material due to its low cost and wide range of residential and commercial applications, including construction, drainage, and the creation of roads, walkways, and other barriers around your outdoor space.. The majority of the material is recycled from demolished …
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Because of this, many construction benefits make use of sand as their primary backfill material. Of course, not all projects are the same. In some situations, it may be better to use a combination of material that is coarse but still strong enough to support the structure. 3. It should be stable and well-compacted.
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Recycled Concrete Aggregate(RCA) — also called "crushed concrete" — is made up of asphalt debris from other construction projects that can be reused to create driveways, pathways, garden beds and more. When any concrete structure, road, sidewalk or parking lot is destroyed, that … See more
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Proper subgrade compaction reduces concrete failure concerns. Joe Nasvik Concrete slabs perform best when they are even thickness. The worker shown here is using a 2x4 to strike flat subgrade. …
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Crushed concrete aggregate can be used in a variety of construction applications, such as a base material for new roads, pavements, and parking lots, as a backfill material for retaining walls and underground …
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Compacted stone backfill is made up of clean crushed rock or limestone, and is commonly used in paving projects like roadways since it reduces the chance of …
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Compacted stone backfill is made up of clean crushed rock or limestone, and is commonly used in paving projects like roadways since it reduces the chance of settlement. Lean Concrete. Lean concrete, also known as controlled density fill or flowable fill, is used in the filling method.
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Some of the most commonly available recycled materials are crushed concrete (CC) and recycled asphalt pavement (RAP), and these materi-als are being considered for use as backfill in MSE walls in Texas. This Project Summary Report (PSR) summarizes the results from the Texas Department of Transporta-tion (TxDOT) Project 0-4177, as related to the ...
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Crushed concrete is recycled concrete that comes in graded and screened sizes for use as a hard fill or drainage aggregate. Versatile. Atlas Concrete can supply a range of products to suit any application, for a drainage medium under a driveway, to backfill behind block walls and drainage around storm water and sewer lines. Great drainage …
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A crushed Concrete Calculator can be an excellent tool for calculating Crushed concrete needs. As a licensed civil engineer and construction specialist with over 20 years of experience, I'm often asked by clients – how much-crushed concrete is required for projects like base layers, trench backfilling, or landscaping. Accurately estimating …
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Figure 1 Recycling concrete as aggregate. Figure 2 Base Aggregate. Figure 3 PCC aggregate. Figure 4 HMA aggregate. Figure 5 Miscellaneous aggregate. Some conclusions that can be drawn from the figures are as follows: Concrete is routinely being recycled into the highway environment in the United States.
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The reason is that the cement paste component of recycled concrete aggregate has substantial influence on the alkalinity within the aggregate. In fact, the pH levels have often exceeded 11. Keep in mind that 7 is neutral and anything over 11 is 10,000 times more alkaline than water.
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RECYCLED ASPHALT PAVEMENT AND CRUSHED CONCRETE BACKFILL: RESULTS FROM INITIAL DURABILITY AND GEOTECHNICAL TESTS 5. Date October 2002 6. Performing Organization Code 7. Author(s) Ellen M. Rathje, Alan F. Rauch, Kevin J. Folliard, David Trejo, Dallas Little, Chirayus Viyanant, Moses Ogalla, Michael Esfeller 8. …
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Backfill materials that are commonly used are described below with their engineering properties. 1. Coarse-grained soils. Coarse-grained soils include gravelly and sandy soils and range from clayey sands ( SC) through the well-graded gravels of gravel-sand mixtures ( GW) with little or no fines. They will exhibit slight to no plasticity.
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Crushed Concrete. Concrete is safe and economical when it comes down to the best material for backfilling a seawall. Concrete is also attractive and increases a property's value. It is important to remember that a seawall can only be as strong as its weakest points. So it's vital to check the integrity of the wall regularly and replace ...
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Backfilling Basics. Backfilling the wrong way often costs more than doing it right. By R. T. Buck Bartley. Download the PDF version of this article. (1.29 ) …
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It is widely considered that crushed concrete aggregate is a kind of inferior con-struction material having strength and stiffness much lower than those of selected natural backfill soils while exhibiting large residual strains during a long life time. Indeed, it is the case when not well compacted (e.g., Mizukami et al., 1998).
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CC was judged as an adequate backfill for MSE walls, although its marginal hydraulic conductivity requires additional drainage to be provided behind walls. RAP displayed a significant potential for deviatoric creep, making this material unsuitable as select backfill for MSE walls. 17. Key Words Recycled asphalt, crushed concrete, MSE walls 18.
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390 posts · Joined 2007. #2 · May 12, 2012. The pole barn builders I have worked with use a concrete "cookie" in the botom of the post hole then backfill with gravel. The cookie is a concrete disk about 12 inches across and five inches thick (IIRC). Seems to work out pretty well as long at the hole is below the frost line.
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16 Oct 07 17:20. I am currently working on a project where the client wants to use recycled concrete from previously demoed floor slabs and foundations as fill material and recycled asphalt as a base course. For recycled concrete, they know to remove all metal and construction debris. They say their crusher can crush the pieces into 6 inch pieces.
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The only way to lower the water table is with proper drainage. The best structural material to use for drainage is 3/4 clean crushed stone. Using all clean crushed stone as backfill can invite "surface" water down to the sides and bottom of your pool. That is why it is imperative to have a perforated pipe at the lowest point of any stone ...
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Recycled Asphalt Pavement and Crushed Concrete Backfill: State-of-the-Art Review and Material Characterization . By Rathje, Ellen M.; Rauch, Alan F.; Folliard, Kevin J.;... [PDF-7.65 ] Select the Download button to view the document This document is over 5mb in size and cannot be previewed ...
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als are being considered for use as backfill in MSE walls in Texas. This Project Summary Report (PSR) summarizes the results from the Texas Department of Transporta-tion (TxDOT) Project 0-4177, as related to the evaluation of crushed concrete (CC) and recycled asphalt pavement (RAP) for use as select backfill for MSE walls. What We Did...
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(15,16) They concluded that pH and resistivity specifications for MSE wall backfill materials should be waived for crushed concrete, concrete structures that have suffered sulfate attack should not be crushed and used as backfill in MSE walls, and MSE walls with crushed concrete backfill should include adequate drains and high permittivity ...
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1. Uses of Crushed Concrete (Unprocessed) In general, applications without any processing include: Many types of general bulk fills; bank …
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Because it becomes permanently attached to the bottoms of the posts, concrete is probably the strongest backfill material, says Hoover Fence Co. Crushed gravel can be almost as strong, however, if you bury the post deep enough. The trick is to use medium-size drainage gravel instead of pea gravel. The individual rocks in drainage …
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