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Recycled Concrete Aggregates

Recycled Concrete Aggregates. ET 493 Instructor: Cris koutsougeras Advisor: Mohamed Zeidan By: Chase Charrier AND Garrett tregre. Introduction.

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Recycled Concrete Aggregates

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

  2. Introduction • Our project will consist of creating, testing, and analyzing concrete mixtures in which recycled concrete aggregates (RCA) and typical aggregates are used • Concrete Basic Components: water, binding material, and aggregates • Concrete’s Structure: will resemble non-load bearing concrete such as pavements and sidewalks • Testing • Slump Test • Compression Test • Tensile Test • Durability Test • Analysis • Effectiveness of RCA • Cost of Typical Aggregate vs. RCA

  3. Background • New process • Discovered through finding a process to recycle rather than dispose of old concrete • Not yet allowed to be used in load-bearing structures • RCA vs. typical aggregate • No significant difference • RCA weakness • Existence of impurities • Ex: Soil, loose cement mortar, wood, and oil • Most removed through crushing the concrete • Hydraulic separation may be necessary for more fine impurities • Detailed cleaned creates struggle with cost effectiveness

  4. 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

  5. 1st Phase • The first phase of this project will include the design of our reference mixture and also the testing of (typical concrete) • Testing will include the slump test, compression test, tensile test, and durability of typical concrete(without RCA) using our reference mix • At the end of all testing, results will be recorded for further analysis

  6. Procedure- Reference Mix • Design a reference mix to be used throughout our project • Reference mix- proportion of each material by mass to create structurally sound concrete • We will consider the strength, workability, and durability in the creation of our mix • Experiment with water/cement ratio, aggregate amount and size, air content, and slump

  7. 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

  8. 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

  9. 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

  10. Compression Test

  11. 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

  12. 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

  13. 2nd Phase • After initial testing of typical concrete has finished, the 2nd phase will begin, which will include the testing of RCA • RCA will replace the typical aggregate(rock, stone) in this portion of testing • We will use our existing concrete mix (1st phase) and crush it to use as the RCA and also an unknown source of RCA gathered from Tycer Ready Mix, located in Hammond, LA

  14. Design of 2nd Mixture • The design of our 2nd mixture will be the same as the first reference mixture to ensure that comparable results are gathered

  15. 2nd Testing • Existing RCA • Slump Test • Compression Test • Tensile Test • Durability Test • Tycer Ready Mix RCA • Slump Test • Compression Test • Tensile Test • Durability Test

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

  17. Timeline/Deliverables • Semester 1: • Week 1: October 8-15, 2013: Research typical design and testing • Week 2: October 15-22,2013: Design typical concrete mix with typical use • Week 3-5: October 22-November 5, 2013: Gather materials needed for first mixture and fresh properties testing; conduct trial mixtures • Week 5: November 5, 2013: Mix first sets of concrete and conduct fresh properties testing • Week 9: December 3, 2013: Strength and durability testing for first concrete mixtures • Semester 2: • Week 1-2: January 27-February 3, 2014: Recheck mixture design and adjust as needed • Week 3: February 10,2014: Mix adjusted sets of concrete and test fresh concrete properties • Week 7: March 10, 2014: Strength and durability testing for adjusted concrete mixtures • Week 8-9: March 17-24 2014: Results analysis • Week 10-11: March 31-April 7, 2014: Cost analysis and comparison • Week 12-15: April 14-May 5, 2014: Final Report Preparation

  18. References • 1.MacDonald, Kevin. "Crushed Concrete." Concrete Construction. Haney Wood, 30 July 2011. Web. 24 Oct. 2013. • 2. "Material Testing." Compression Test on Concrete. Building Research Institute, n.d. Web. 25 Oct. 2013. • 3. “Materials: Recycled Aggregates.” Concrete Technology. Portland Cement Association. Cement.org. Web.

  19. Questions • ???????

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