aggregate blending -...
TRANSCRIPT
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Aggregate Blending
Thursday February 22, 2018
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Concrete
Cementitous
water & admixtures
GLUE!
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Typical Components of Concrete
Fine aggregate
25%
coarse aggregate
45%
water & admixtures
15%
Cementitous
10%
air 5%
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Characteristics of Aggregates• Gradation
• Specific Gravity
• Moisture Content
• Strength
• Freeze-thaw resistance
Cost & Availability
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Curling/Warping
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A Little Science
(Just a little, I promise)
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Concrete water content vs. ultimate shrinkage
8
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The Move to Larger Aggregate
• Many engineers are looking to use
– concrete with larger aggregates
– More aggregate in the mixture
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Aggregates grading and size
effects A mixture of particle
sizes is more
efficient at filling
void space than all
particles of any one
size.
Larger maximum
sizes also help
graded aggregates
fill volume more
effectively.
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Cubic Yard
3’
3’
3’
Volume =27cf Surface Area = 162 Sf
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CUBIC YARD
3’
3’
3’
Volume = 27 cf Surface Area = 54 sf
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Effects of aggregate grading on mixture paste fraction
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Tools for analyzing combined aggregate grading
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Coarseness Factor Chart
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ACI 302
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Individual Percent Retained
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8-18
0%
2%
4%
6%
8%
10%
12%
14%
16%
18%
20%
22%
24%
26%
28%
30%
2" 1.5" 1" 3/4" 1/2" 3/8" #4 #8 #16 #30 #50 #100 #200
ASTM Standard Sieve Size
Combined % Retained
Original Revised
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0.45 Power Curve
1.5
"
1"
3/4
"
1/2
"
3/8
"
#4
#8
#16
#30
#50
#100
#200
0.0%
10.0%
20.0%
30.0%
40.0%
50.0%
60.0%
70.0%
80.0%
90.0%
100.0%
ASTM Standard Sieve Size
0.45 Power Curve
Orig
Rev
0.45 Power Curve
Perc
ent P
assin
g
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Oklahoma State University
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8-18
0%
2%
4%
6%
8%
10%
12%
14%
16%
18%
20%
22%
24%
26%
28%
30%
2" 1.5" 1" 3/4" 1/2" 3/8" #4 #8 #16 #30 #50 #100 #200
ASTM Standard Sieve Size
Combined % Retained
Original Revised
0%
2%
4%
6%
8%
10%
12%
14%
16%
18%
20%
22%
24%
26%
28%
30%
2" 1.5" 1" 3/4" 1/2" 3/8" #4 #8 #16 #30 #50 #100 #200
ASTM Standard Sieve Size
Combined % Retained
Original Revised
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Tools to Assist
• Shilestone Software
• Compass
• www.trantulacurve.com
• Make your own spreadsheet?
• But… Math is based on volume, not weight
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Issues
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CRT’s Opinion
• Larger top size
– Approximately 5% retained on the 1”
• Of all aggregates, not just the coarse
• Better graded
– No holes
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Example
• The process works
• Example