Recycled Concrete Aggregates ET 493 INSTRUCTOR: CRIS KOUTSOUGERAS ADVISOR: MOHAMED ZEIDAN BY: CHASE CHARRIER AND GARRETT TREGRE
Jan 18, 2016
Recycled Concrete Aggregates
ET 493
INSTRUCTOR: CRIS KOUTSOUGERAS
ADVISOR: MOHAMED ZEIDAN
BY: CHASE CHARRIER AND GARRETT TREGRE
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
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
PurposeResearch 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
1st PhaseThe 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
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
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
Slump Test ProcedureFresh 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
Compression TestASTM 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
Compression Test
Tensile TestASTM 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
Durability TestASTM 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
2nd PhaseAfter 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
Design of 2nd MixtureThe design of our 2nd mixture will be the same as the first reference mixture to ensure that comparable results are gathered
2nd TestingExisting RCA
Slump Test Compression Test Tensile Test Durability Test
Tycer Ready Mix RCA Slump Test Compression Test Tensile Test Durability Test
AnalysisTypical Aggregate vs. RCA
Compare performance is cases of: Strength Durability Workability
Perform cost analysis
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
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.
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