Because concrete and rebar construction is extremely strong, it is used in all kinds of buildings and infrastructure from residences to storefronts to factories and roadways. Rather than send all of this valuable material to landfills, concrete demolition contractors and recyclers can turn this waste product from demolition sites into a valuable end product, that may be used in a variety of projects.Get A Quote
Below, we provide a basic guide for demolition contractors and concrete recyclers on how to select the best concrete crusher for the project at hand. We begin with an overview of the three basic types of crushers on the market.
Cone crushers. These are less common in recycling applications. Their basic crushing chamber shape is a cone whose open top accepts rock. As the aggregate moves down toward the base of the cone, they are crushed between two internal liners one that is fixed and another that is moving in an eccentric motion. Cones are best used in hard, abrasive rock and are not ideal in recycling applications, as they have low tolerance to tramp iron and other contaminants found in demolition materials, and can only be used in secondary and tertiary crushing applications.
Once you understand these basic types of crushers, you can proceed to more specific characteristics of the machine at hand. Here are the qualities concrete demolition contractors typically review when choosing a new crusher.
Feed material type and sie Can the machine process only concrete, or may other materials be mixed in What is the max feed sie that can be processed safely and cost effectively by the machine These are important questions that need answering when choosing the right machine for your application.
Output sie. This determines what type of products may be produced from the crusher. A jaw will produce a coarse 3 8 minus, while with a closed circuit impactor you can make minus or even smaller if required.
Production rates. Each machine has its own productivity pace, typically described in tons of material processed per hour. Be wary of stated claims on brochures, you should check with users who operate the equipment in question who have verified means of measuring realistic production numbers.
Reduction ratio Jaw and cone crushers have an approximate 41 81 reduction ratio, while horiontal shaft impactors have up to a 151 reduction ratio.
Equipment sie. Machine dimensions determine storage and transportation options. Before purchasing a crusher, you should assess where you will be moving the crusher, and what the weight and sie restrictions are for that region.
Specification Comparisons We recommend creating a spreadsheet when assessing various brands of a similar type of crusher. The initial purchase price means very little in the overall picture, so start to look and compare important specifications.nbspnbsp.
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The waste generated at Portland demolition and construction sites accounts for about 25 percent of the waste found in city landfills. Much of this waste can be recycled or reused, including concrete. The concrete crusher at Elder Demolition makes us one of the most environmentally proactive demolition companies in Oregon and the Northwest. The impressive equipment crushes pieces of concrete into reusable gravel we recycle onsitea key component of any green demolition project. Thanks to our concrete crusher, we recycle thousands of tons of concrete at Portland demolition sites every year.
After tearing down a building using specialied equipment, such as high-reach excavators, our crew places concrete into discrete piles and removes extraneous materials. Using an excavator, workers load the salvaged pieces of concrete into a crusher.
The machine grinds the pieces of concrete into gravel-sied chunks that are great for structural fill, pipe bedding, road compaction and other applications. You can also mix crushed concrete with sand, water, Portland cement and virgin aggregate to make new concrete thats stronger and lighter than using concrete made of virgin materials. After concrete passes through a crusher, workers separate the pieces by sie and remove any scrap metal using strong electromagnets.
Concrete is recyclable After water, concrete is the most consumed material in the world. With buildings containing up to 80 percent concrete, its easy to see how the construction industry uses it two times more than all other building materials combined. While you cant break it completely down, you may use concrete as an aggregate or to make new cement.
Earn LEED points Adding concrete crushing to your Portland demolition or construction project may help you earn coveted LEED points. It takes water, coal, oil and gas to mine gravel, a limited resource. When you crush concrete onsite, you reduce your projects carbon footprint. Simply recycling one ton of concrete saves up to 1,984 pounds of carbon dioxide and 1,300 gallons of water. Elders concrete crushing services allow you to reuse the recycled material onsite, which helps save fuel.
Durability Because concrete is so tough, it doesnt break down easily in landfills. This makes it a good candidate for reusing and recycling. Even crushed and recycled concrete is long-lasting and resists impacts, the elements, pests and sunlight.
Versatility Crushed concrete can be used for a number of applications, including landscaping, foundations, structural fill, road bases, leveling, backfill, pipe bedding, erosion control, and to make new concrete.
Jaw crushers use two vertically-oriented tapered jaws that work similarly as a nutcrackers jaws. A flywheel makes the jaws open and close, allowing only small pieces of concrete to pass.
Some impact crushers fling pieces of concrete against a hard surface at a high velocity, causing the material to break naturally along internal fissures. Other types of impact crushers use a hammer to break concrete placed on the outer edge of a spinning rotor. This type of crusher is great for concrete with wire mesh or rebar.
Cone crushers are not commonly used on Oregon demolition sites. They have a conical shape and accept concrete at the base. Two gyrating spindles inside the machine squeee the pieces of concrete together, causing them to break and exit through an opening in the cone.
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Because concrete and rebar construction is extremely strong, it is used in all kinds of buildings, from residences to storefronts to factories. Commercial and industrial demolition projects often contain hundreds of tons of concrete. Rather than send all of this valuable material to landfills, concrete demolition contractors can break it into smaller pieces that may be used in a variety of projects.
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