Recycled Concrete Slab gains meaning because it protects natural resources

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Much of the U.S. exploration focused on using crushed, hardened concrete as an aggregate inside fresh concrete has been in road paving. Work on this subject started with a major effort in the 1980s in Minnesota. Unfortunately, the majority of the exploration focused on using recycled concrete aggregate (RCA) as a foundation material to the pavement.

But in other areas of the world, many accept RCA as a important aggregate resource when appropriately intregated into the mix design development. For example, Japan has used RCA for more than 20 years in structural concrete applications.

RCA can be used effectively in structural concrete. Dr. A. Ghani Razaqpur, a professor and chair of the Civil Engineering Department at McMaster University in Hamilton, Ontario, gave a presentation at the 2008 Concrete Technology Forum, sponsored by NRMCA in May in Denver. Razaqpur disputes the perception that concrete (plain or reinforced) made with RCA has inherently low-grade short- and long-term components. He supported his contention by highlighting the results enclosed in the essay, "The Key to the Design and Manufacture of High Quality Structural-Grade Recycled Aggregate Concrete."

Razaqpur described how his group examined 14 different mix designs using RCA. They examined fresh and hardened components (slump, fresh and hardened density, elastic modulus, compressive strength, stress-strain correlation, creep, and shrinkage) and compared the results to alike reinforced concrete prepared with fresh structural concrete.

The outcome of his work is a original mix-proportioning method for concrete prepared with coarse recycled concrete aggregate, in which RCA is regarded as a two-phase material comprising mortar and organic aggregate. The residual mortar in RCA is considered part of the total mortar (fresh plus remaining mortar) in the mix. "By testing an widespread number of specimens, we have demonstrated that the proposed procedure would result in developing high-quality, structural-grade concrete, with predictable results," said Razaqpur.

Razaqpur hopes this new method to mix proportioning will encourage using RCA in structural concrete.

At the same event, Bill Palmer, senior engineer at Total Construction Consultants, a Boulder, Col.-based consulting firm, presented a number of additional resources for information on using recycled aggregates in concrete. He listed several organizations that can provide aid and technical information:

The first time I'd seen one, was outside a restaurant where I lived and they did a pretty good job, using the portions of an aged sidewalk, innovatively. I never seen something like this before and like most of us know, there's a first point for everything. Building concrete stairs by means of recycled materials got me thinking about other things that we may possibly construct with recycled building products.

People are not just using recycled concrete for stairways, they're using them for minor retaining walls. Recycled concrete retaining walls and stairways can be designed from slight to large sections of destroyed sidewalks and driveways.
Simply position the destroyed pieces into attractive shapes, until you have something that functions as a staircase. Start from the base and work your way up, until you have created a beautiful recycled concrete stairway.

If you're planning on building a retaining wall out of used concrete, merely stack these materials on top of each other, until you've shaped the retaining wall, you envisioned. I do not advocate building retaining walls higher than twenty four inches with these types of materials.

Article Source: http://depositarticles.com/

Recycled Concrete Reinforced Concrete

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