RECYCLING HAS BECOME a major activity for a lot of HMA producers around the country. But many of them bemoan the fact that there are no easily portable crushing plants they can use to process the material at remote locations. Well, the engineers at Zenith must have been listening to their customers once again, because the company has just introduced the RP3036 portable crushing plant, a unit that was designed specifically for processing light reinforced concrete and reclaimedasphalt pavement (RAP).

Portable Concrete Crusher recycling crushing

Portable Concrete Crusher recycling crushing

A highly portable, closed-loop crushing system FOX’s RP3036 portable concrete and RAP crusher plant is a highly portable unit that features a closed-loop processing pattern. It will handle RAP of any kind or size, whether it is ripped material or millings. It will also handle smaller, wire-reinforced concrete material up to about 4 x 24 x 24 in. (10 x 61 x 61 cm).

The raw material is dumped into the hopper of the vibrating grizzly feeder that has a grizzly bypass. This allows the finer millings to by-pass the horizontal-shaft impact crusher. This bypass material falls onto the conveyor and goes directly to the double-deck screen, while the oversize material goes into the crusher.

Overs on the top deck of the double-deck screen go onto a return conveyor, where they are carried back to the crusher to be processed once again. Material passing the top screen may be conveyed to the product stockpile. A Zenith spokesman said this is one of the advantages of the new plant: Instead of returning the overs back into the hopper, they go directly back to be crushed.

The plant is also unique in that the second-deck overs can be directed out of the system for use in a second product. This versatility will undoubtedly be very useful.

Nothing to take apart or fold down for traveling One of the main features of the new Zenith plant is its high degree of portability. There is nothing the producer needs to take apart or fold down before hooking up the unit for traveling. The travel height is only 13 ft. 6 in. (4.1 m) and the length is 54 ft. 10 in. (16.5 m). Total weight is 49,300 lb. (22.3 metric tons). There is also very little set-up involved when the plant arrives at the job site. The feed height is only about 13 ft. (4 m)—so there is no ramp required in order for the front-end loader to zly feeder that has a grizzly by- have easy access.

SHELBY COUNTY has recycled 6,500 tons of old concrete into aggregate, reducing its need for new limestone aggregate.

The process The county hired a portable concrete crushing plant to crush accumulated road slabs, curbs, culvert pipe, sidewalks, and other miscellaneous concrete. Concrete crushing plants vary in function, size, etc. The plant used by Shelby County had a 24 x 30-inch bin, which was filled by a loader; an excavator was used to break up large pieces before loading. During processing, the plant separated dirt from the concrete.

Many crushers can create different grades, or sizes, of aggregate. Large pieces can be recycled as stabilizing agent; smaller pieces can be used as road aggregate. Shelby County has used crushed concrete as roadbed base aggregate. Dan Ahart, Shelby County engineer, says that the durability of the recycled concrete base is comparable to limestone and that he and his engineers are satisfied with its performance.

Used Portable Concrete Crusher

Used Portable Concrete Crusher

Lessons learned

Ahart says that he and his staff learned several lessons about crushing concrete into usable material:

  • Monitor input of the concrete into the crusher. Dirt and debris can clog the machine. The crushing company may even refuse to process concrete containing too much dirt and debris.
  • Remove concrete that may contain metal. Some culvert pipe, for example, has a metal mesh that helps it hold its shape. If used as aggregate, the exposed metal may puncture vehicle tires.
  • Select a crusher that fits your needs. Criteria may include bin size, gradation capability, and mobility.
  • Building accessible sidewalks

HAVE YOU EVER WALKED a mile in someone else’s shoes? Or ridden in someone else’s wheelchair? City planners and engineers can design more accessible sidewalks after seeing the hazards of unsafe and inaccessible sidewalks through the eyes of a disabled pedestrian.

Now this is possible through a video created by the Access Board, a federal agency developing and enforcing accessibility guidelines–such as Section 508. The video, Accessible Sidewalks: Design Issues for Pedestrians with Disabilities, shows how people with disabilities experience different sidewalk and pedestrian crossing designs.

The 40-minute video is divided into four sections focusing on issues for pedestrians with different accessibility requirements, as follows: Lessons learned

Ahart says that he and his staff learned several lessons about crushing concrete into usable material:

  • Monitor input of the concrete into the crusher. Dirt and debris can clog the machine. The crushing company may even refuse to process concrete containing too much dirt and debris.
  • Remove concrete that may contain metal. Some culvert pipe, for example, has a metal mesh that helps it hold its shape. If used as aggregate, the exposed metal may puncture vehicle tires.
  • Select a crusher that fits your needs. Criteria may include bin size, gradation capability, and mobility.

Cost

At $5.50 to $6.50 a ton, recycled concrete can save more than two dollars per ton compared to new limestone. Limestone costs about $7.50 per ton, plus transportation costs of 12–14 cents per mile.

  • pedestrians who use wheelchairs
  • pedestrians with ambulatory impairments
  • pedestrians with low vision
  • pedestrians who are blind

Each section explores the specific needs of that group. For example, the section dealing with accessibility for blind pedestrians discusses the importance of auditory crossing signals, while the section for those who use wheelchairs shows the importance of wide sidewalks and gradual slopes from the street to the sidewalk.

 

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