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9740.010
Al-Manaseer, A.A.; Dalal, T.R.
Concrete International
Article
August 1997
In the last decade, considerable research has been conducted on the utilization of waste by-products in concrete. Such by-products in include fly ash, discarded tires, steel slugs, burnt foundry sand, glass, and fibers. Each waste by-product has provided a specific effect on the properties of fresh and hardened concrete. The use of waste by-products in concrete not only makes it economical, but also solves some of the disposal problems.
Conclusion: The following conclusions can be drawn on the sue of post-consumer plastic aggregates in concrete.
1. Post-consumer plastic aggregates can be used successfully to replace conventional aggregate in concrete. A field trial evaluation has been successfully conducted to demonstrate the feasibility of the concept. Laboratory testing showed that the 28-day compressive strength of concrete containing plastic aggregates at different percentages of 10 to 50 percent ranged form 7000 to 2800 psi (48 to 19 Mpa) while the splitting tensile strength ranged from 942 to 467 psi (6.5 to 3.2 Mpa).
2. The use of post-consumer plastic aggregates in concrete reduced the overall concrete bulk density. When compared to conventional concrete, the bulk density was reduced by 2.5 percent for concrete containing 10 percent plastic aggregates, 6 percent for concrete containing 30 percent plastic aggregates, and 13 percent for concrete containing 50 percent plastic aggregates.
3. Concrete containing plastic aggregates has a more ductile behavior than similar types of concrete made with conventional aggregates. This ductile behavior could be very advantageous in minimizing crack formation in concrete structures. If such a concrete can be produced, then current design theories can be changed and concrete structures can be safely over-reinforced.