drying shrinkage
TRANSCRIPT
Drying Shrinkage
Presentation By
Savita Goel
May 17, 2002
Overview
• Test Program
• Test Results Data
• Phase II Tests
Specifications
•ASTM C 157
•ASTM C 490
Specimens: Mortar Bars
• Size: 1”x1”x10”
• No.: 3 nos. with studs at each end along the length of the bar
• Total Bars Made: 144
Specimens: Concrete Cylinders
• Size: 6”x12”• No.: 2 nos. with 3
demec stud points along the surface on each cylinder
• Total cylinders made: 108
Curing
• Temperature: 23o C + 1.5o C
• Relative Humidity: > 98 %
• Duration: 7 Days and 14 Days
Drying
• Mortar Bars
– Temp.: 73.3 + 3 oF
– RH: 50 + 4 %
•Concrete Cylinders
–Temp.: 96 + 3 oF
–RH: 20 + 4 %
Instrumentation
• Length Comparator
• Demec Strain Gage
Length Measurement Age
• Length measured at drying age of– 4, 7, 14, 21, 28, 35, 42, 49, 56, 90,
180 and 365 Days
Mixtures
• Mortar: 24 mixtures
• Concrete: 12 mixtures
Tests
• Fresh Concrete– Slump (5 + 1 ½ ”)
– Air Content (6 + 1 ½ %)
– Unit Weight
– Temperature
• Hardened Concrete
– Compressive Strength (at 7 & 28 Days)
Influence of w/cm(28-Days Drying Shrinkage As Per B3 Model)
0.35 0.4 0.45w/cm
Dry
ing
Sh
rin
kag
e
Influence of Relative Humidity(7Days Moist Cured 100% PC Mortar Bars)
0
500
1000
1500
2000
0 20 40 60 80 100Drying Age (Days)
Dry
ing
Sh
rin
ka
ge
(M
icro
str
ain
s)
6.5x/PC100/50%
6x/PC100/50%
5.5x/PC100/50% 6.5x/PC100/70%
6x/PC100/70%
5.5x/PC100/70%
7 Days Moist Cured - 6x/PC-FA-SF Mortar Bars
0
500
1000
1500
2000
0 10 20 30 40 50 60 70Drying Age (Days)
Dry
ing
Sh
rin
kag
e (M
icro
stra
ins)
6x/PC100
6x/PC70FA30
6x/PC70FA27SF3
7 Days Moist Cured - PC-BS-SF Mortar Bars
0
500
1000
1500
2000
0 10 20 30 40 50 60 70 80Drying Age (Days)
Dry
ing
Sh
rin
kag
e (M
icro
stra
ins)
6x/PC100
6x/PC65BS35
6x/PC55BS42SF3
7 Days Moist Cured - PC-SF Mortar Bars
0
500
1000
1500
2000
0 10 20 30 40 50 60 70Drying Age (Days)
Dry
ing
Sh
rin
kag
e (M
icro
stra
ins)
6x/PC100
6x/PC55BS42SF3
6x/PC97SF3
6x/PC70FA27SF36x/PC93SF7
7 Days Moist Cured - 100% PC Concrete Cyl.
0
100
200
300
400
500
600
0 10 20 30 40 50 60 70Drying Age (Days)
Dry
ing
Sh
rin
kag
e (M
icro
stra
ins)
6
5.5
6.5
7 Days Moist Cured - PC-FA-SF Concrete Cyl.
0
100
200
300
400
500
600
0 10 20 30 40 50 60 70
Drying Age (Days)
Dry
ing
Sh
rin
kag
e (M
icro
stra
ins) 6x/PC100
6x/PC70FA30
6x/PC70FA27SF3
7 Days Moist Cured - PC-BS-SF Concrete Cyl.
0
100
200
300
400
500
600
0 10 20 30 40 50 60 70Drying Age (Days)
Dry
ing
Sh
rin
kag
e (M
icro
stra
ins)
100 % PC
PC 65 BS 35
PC 55 BS 42 SF 3PC 55 BS 45
7 Days Moist Cured - PC-SF Concrete Cyl.
0
100
200
300
400
500
600
0 10 20 30 40 50 60 70Drying Age (Days)
Dry
ing
Sh
rin
kag
e (M
icro
stra
ins)
6x/70FA27SF3
6x/PC97SF3
6x/PC100
6x/PC55BS42SF3
Conc Cyl - Conc Bars - Mortar Bars(6x/PC97SF3)
0
500
1000
1500
2000
0 10 20 30 40 50 60 70Drying Age (Days)
Dry
ing
Sh
rin
kag
e (M
icro
stra
ins)
Conc. Cyl.(375)
Conc. Bar (407)
Mortar Bar (1449)
Phase II Test
• 25 Concrete Mixtures Based on Comp. Strength and Strength Ratio
• Specimens:– 4”x4”x10” Concrete Bars– 6”x12” Concrete Cylinders
Thank You !
Any Questions ?