why monitor concrete temperature? and how?aug 08, 2018 · temperature, °f astm c 403 thermocouple...
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![Page 1: Why Monitor Concrete Temperature? And How?Aug 08, 2018 · Temperature, °F ASTM C 403 Thermocouple Initial set. Initial Set 0 5 10 15 20 0 5 10 15 20 ASTM C 403, hours Thermocouple,](https://reader031.vdocument.in/reader031/viewer/2022011908/5f627561be36ec45aa5283f0/html5/thumbnails/1.jpg)
Why Monitor Concrete Temperature?And How?
Peter Taylor
![Page 2: Why Monitor Concrete Temperature? And How?Aug 08, 2018 · Temperature, °F ASTM C 403 Thermocouple Initial set. Initial Set 0 5 10 15 20 0 5 10 15 20 ASTM C 403, hours Thermocouple,](https://reader031.vdocument.in/reader031/viewer/2022011908/5f627561be36ec45aa5283f0/html5/thumbnails/2.jpg)
What Are We Talking About?
• Maturity• Isothermal Conduction Calorimetry• Field Semi-Adiabatic Calorimetry• Heat of Hydration• Setting Time
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Definitions
• Isothermal (constant temperature)• Adiabatic (no energy transfer)• Semi-adiabatic (some, known, energy
transfer)
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Maturity
• Using a time/temperature function to estimate strength (or other property)
• No thermal control
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![Page 6: Why Monitor Concrete Temperature? And How?Aug 08, 2018 · Temperature, °F ASTM C 403 Thermocouple Initial set. Initial Set 0 5 10 15 20 0 5 10 15 20 ASTM C 403, hours Thermocouple,](https://reader031.vdocument.in/reader031/viewer/2022011908/5f627561be36ec45aa5283f0/html5/thumbnails/6.jpg)
Why?
•• Replaces TemperatureReplaces Temperature--Matched Matched Curing of Cylinders in Thermal Curing of Cylinders in Thermal Control PlansControl Plans
•• Can Reduce Construction TimeCan Reduce Construction Time
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• Use laboratory testing to develop a relationship
• Monitor concrete using temperature probes
How?
Note: Maturity testing does not indicate quality of concrete
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ASTM C1074 Maturity
•• TimeTime--Temperature Factor (Temperature Factor (°°FF··hr)hr)
•• Equivalent Age (days)Equivalent Age (days)
t)T-(T=Mt
0=to
te=Mt
0=t
T1-
T1Q-
sa
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Footing Example
0
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0 1 2 3 4 5 6 7
Time, Days
Tem
pera
ture
, °C
Center Top Bottom
7 Day Equivalent Age7 Day Equivalent Age
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But…
•• Maturity relation required for each Maturity relation required for each mixmix
•• Provides an estimate of a property Provides an estimate of a property based on indirect measurementsbased on indirect measurements
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Calorimetry
• Measuring heat in paste mixtures to assess hydration kinetics
• i.e. How do system chemistry, admixtures and SCMS influence hydration
• Isothermal
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How?
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How?
Heat sink
Test Sample
Reference Sample
Peltier Sensors
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Why?
0
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0:00:00 6:00:00 12:00:00 18:00:00 24:00:00
Time of Hydration (hrs)
J/gh
Sample "1PA"Sample "2PA"Sample "3PA"Sample "4PA"Sample "5PA"Sample "6PA"
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Why?
Hydration Profile
0.00
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Time of Hydration (hrs)
J/gh
Sample "5P"Sample "5C"Sample "5F"Sample "5S"
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Why?
Effect of Water Reducer Dosage on Hydration
0.00
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0:00:00 6:00:00 12:00:00 18:00:00 24:00:00
Time of Hydration (hrs)
J/gh
No Adm WRA x1
WRA x2
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Why?
0.0
0.5
1.0
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0 5 10 15 20 25 30 35 40 45
Time of Hydration (hours)
Hea
t (m
V)
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But…
•• Small paste samplesSmall paste samples
•• Fixed temperatureFixed temperature
•• May not flag all aluminate reaction May not flag all aluminate reaction problemsproblems
•• Takes up to 24 hoursTakes up to 24 hours
•• Other techniques?Other techniques?
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Field Semi-Adiabatic Calorimetry• Measuring heat in mortar /concrete
to assess hydration kinetics• i.e. Is the system hydrating?• Semi(ish) adiabatic
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How?
![Page 21: Why Monitor Concrete Temperature? And How?Aug 08, 2018 · Temperature, °F ASTM C 403 Thermocouple Initial set. Initial Set 0 5 10 15 20 0 5 10 15 20 ASTM C 403, hours Thermocouple,](https://reader031.vdocument.in/reader031/viewer/2022011908/5f627561be36ec45aa5283f0/html5/thumbnails/21.jpg)
Why?
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Why?
Gary KnightGary Knight
![Page 23: Why Monitor Concrete Temperature? And How?Aug 08, 2018 · Temperature, °F ASTM C 403 Thermocouple Initial set. Initial Set 0 5 10 15 20 0 5 10 15 20 ASTM C 403, hours Thermocouple,](https://reader031.vdocument.in/reader031/viewer/2022011908/5f627561be36ec45aa5283f0/html5/thumbnails/23.jpg)
But…
•• CoarseCoarse
•• Takes timeTakes time
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Heat of Hydration
• Measuring heat generated by a cementitious system (paste)
• Used for heat calculations in mass concrete
• Adiabatic / Semi adiabatic
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Why?
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How?
•• ASTM C ASTM C 186186
•• CalorimeterCalorimeter
•• Concrete Concrete cubecube
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How?
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0:00 24:00 48:00 72:00 96:00 120:00 144:00 168:00
Time of Hydration, hrs
J/g
CTLGroupCTLGroup
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But…
•• Not standardizedNot standardized
•• yetyet
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Time of Set
• Using temperature monitoring to measure time of set
• Semi-adiabatic
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Why?
CTLGroupCTLGroup
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Initial set
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Initial Set
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CTLGroupCTLGroup
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• Useful data can be collected•For characterizing materials•Investigating interactions•Tracking uniformity•Timing finishing activities•Tracking hydration
• Use the right equipment for the right application
Summary
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