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Recycled Concrete Aggregates

Recycled Concrete Aggregates

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Recycled Concrete Aggregates

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  1. Recycled Concrete Aggregates ET 493-Fall 2013 Instructor: Criskoutsougeras Advisor: Mohamed Zeidan By: Chase Charrier AND Garrett tregre

  2. What are RCA’s? Concrete Components: 1. Water • 2. Binding Material • 3. Coarse Aggr.(Rock) • 4. Fine Aggr. (Sand)

  3. What are RCA’s Concrete slab / Concrete Structure Recycling Concrete -> RCA’s

  4. Introduction • Comparing RCA to Typical Aggregate 1. Performance Analysis 2. Cost Analysis RCA Typical Aggregate

  5. Purpose • Research and test the effectiveness of RCA’s use in the construction field • Increase RCA’s use in the construction field • Provided an ECO friendly industry through RCA’s

  6. Concrete’s Intended Use • Sidewalk and Pavements • 4000 PSI – Compressive Strength

  7. Design Mix

  8. Design Mix

  9. Design Mix

  10. Materials • 1. Cement, Gravel, Sand • 2. Concrete Mixer • 3. Slump Cone Test Set • 4. Molds for Testing • 5. Scales • 6. Tampering Rod • 7. Air Content Pressure Meter

  11. Slump Test • ASTM C143 Standard • Measures the mixtures fresh concrete properties • Consistency & Workability- measure of the ease at which the concrete flows • Also measures the consistency between multiple batches of concrete • Different slumps are required for different applications • The slump test measures concrete’s behavior to the force of gravity • More slump = more water and workability • Smaller slump = drier mix with less workability

  12. Slump Test Procedure • Fresh concrete is placed into a metal cone with a diameter of 4” at one end and 8” at the other end being 12” tall • The concrete is placed into the cone in 3 stages and at each stage the concrete is tampered with a 2’ metal rod, 5/8” in diameter • The final stage is to level off the concrete, remove the cone, and measure the slump

  13. Air Content Test • ASTM C231/C231M-10 • Determines the amount of air in a fresh concrete mix • Three Methods: • Pressure Method • Volumetric Method • Free Air Method • Pressure applied to fresh sample of concrete to compress air entrained pores • Meter on device measures pressure • Pressure-to-Volume relationship to Boyle’s Law is used to calculate air content

  14. Compression Test • ASTM C39 standard • Measures concrete’s ability to withstand compression forces • Strength normally relates the overall quality of the concrete • Concrete is molded into cylinders in which the length is twice the diameter and the diameter is three times the maximum aggregate size • After 28 days are given for proper time to cure, the cylinders are tested • Compression test is performed by applying an axial load to the test cylinder at a constant rate until failure occurs

  15. Compression Test

  16. Tensile Test • ASTM C496 standard • Measures concrete’s ability to resist tensile forces • Tensile strength is much smaller than concrete’s compression strength • Test is performed by placing a concrete cylinder horizontally under a compression machine and applying a force until splitting occurs • Concrete Cylinder- common size 150mm by 300 mm

  17. Durability Test • ASTM C779 standard for abrasion testing • Measures of concrete’s ability to last over time • We will measure our concrete’s durability through a sandblasting abrasion test • The concrete abrasion test involves spraying our concrete test piece with a sandblaster from a distance of 75 +/- 2.5mm for a length of 1 min. • The volume lost due to abrasion is measure by filling the abrasion cavities with modeling clay

  18. Analysis • Typical Aggregate vs. RCA • Compare performance is cases of: • Strength • Durability • Workability • Perform cost analysis

  19. Timeline/Deliverables • October 2013- Research typical mixture designs and testing-Completed • November 2013- Design a reference mixture of concrete-Completed • December 3, 2013-Gather aggregates and cement from Tycer Ready Mix-Completed • December 2013- Order testing equipment-Completed • December-January 2013-2014- Conduct trial mixtures/Fresh properties testing • February 2014- Strength and Durability Testing • March 2014- Mixture adjustments • April 2014- Cost Analysis • April-May 2014- Final Report Preparation

  20. References • 1. ASTM Standards: C143, C231/C231M-10; C39; C496; C779 • 2. “Concrete Air Entrainment Tests.” Durham Geo Slope Indicator. Durham Geo-Enterprises, Inc. durhamgeo.com. Web. 4 Dec. 2013. • 3. Gee, King W. “Use of Recycled Concrete Pavement as Aggregate in Hydraulic-Cement Concrete Pavement.” U.S. Department of Federal Transportation. Federal Highway Administration. 3 July 2007. Fhwa.dot.gov. Web. 4. MacDonald, Kevin. "Crushed Concrete." Concrete Construction. Haney Wood, 30 July 2011. Web. 24 Oct. 2013. • 5. "Material Testing." Compression Test on Concrete. Building Research Institute, n.d. Web. 25 Oct. 2013. • 6. “Materials: Recycled Aggregates.” Concrete Technology. Portland Cement Association. Cement.org. Web.

  21. Questions • ???????