Concrete Maturity Monitoring System
Technology Advances in Concrete Maturity A WIRELESS SYSTEM
WAKE, Inc. Sturgis, Michigan 800-588-6393 Contact: Richard Yesh email - ryesh@wakeinc.com 1
Concrete Maturity Monitoring System
The Concrete Maturity Monitory System is the linking of two relatively new technologies. • Concrete Maturity Method • Radio Frequency Identification (RFID)
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Concrete Maturity Concrete Maturity allows you to track the increasing strength of concrete as it matures by monitoring the internal temperature of the concrete.
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Radio Frequency Identification (RFID) RFID allows the user to read and write information to or from what we refer to as an RFID Tag. Using radio frequency you eliminate the need to have a clear line of sight (It will read right through the concrete). 4
Components Of The System • • • • •
Antenna Transceiver Transponder Software Portable Data Collection Device
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Wireless Technology • Advantages – Wireless – Programmable – Data logging
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Wireless VS Wires
• Bury the RFID Tag. • Cover it with concrete. • Tag collects the temperature data.
and Reduction of destructive testing.
• Retrieve data when applicable. • Nothing to hook up! • Nothing to destroy! 7
RFID Tag with External Probe
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Columns & Heavy Structures
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Portable Data Collection Device can be one of several units. • • • • •
PC Laptop HP iPAC Unitech Portable LXE Portable and others 10
Portable Data Collection Device This is the Unitech. It is one of several portable devices that can be used with our Concrete Maturity Monitoring System, to collect the data.
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Andrew DeFinis P.E. of the Tony Angelo Cement Construction Co. is checking out one of the buried RFID tags from his pickup. The robust iQ32T RFID tag allows him to do this.
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This is the CONCRETE TYPES window used for the Nurse-Saul (Time Temp Factor) or the Arrhenius (Equivalent Age) Maturity Method. The screen allows input of test results in MPa or PSI.
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By selecting a tag this Temperature Window will provide a detailed view of the temperature log along with other statistical tag data.
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The graph shows 48 logging intervals at a time providing a visual of the temperature log.
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IRD Concrete Maturity Meter: Concrete Report Time/Date 10/12/03 Tag ID
0.0.209.64
Location
Ramp center
Concrete Summary: Chronological Age: TTF: TTF datum temperature Strength Pour time
416.46 14029.3 -10 Deg C 5710 10/01/03
Hours Deg.C-Hrs Concrete psi
Temperature Log Summary: Log Interval Start Time End Time Sample Count Average Temperature Highest Temperature Lowest Temperature
30 10/01/03 9:38 10/12/03 8:49 834 90.4 103.4 65.1
Minutes Local Local Degree F Degree F Degree F Page 1 of 2 16
IRD Concrete Maturity Meter: Concrete Report Time/Date 10/12/03 Tag ID
0.0.209.64
Location
Ramp center
Mix = HC Special PSI = 6500 Not part of Report
Temperature Log Data Tag Temperature F
Date
Time
TTF Deg. C-Hrs
Strength psi
65.1
10/01/03
09:50
34.7
0
97.9
10/01/03
12:20
809.0
0
103.4
10/02/03
12:20
1669.8
745
101.4
10/03/03
12:20
1737.8
1272
99.5
10/04/03
12:20
1914.7
1870
93.7
10/05/03
12:20
2091.7
2180
88.3
10/06/03
12:20
2280.6
2733
84.9
10/07/03
12:20
2475.5
3065
79.6
10/12/03
12:20
4874.3
4312 17
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Maturity Monitoring is Essential! Actual job site - March 17, 2001 @ 7:30AM - ambient temperature 38째 F
The Deck Is Hot
The Cylinders are not!
Curing conditions of deck: Heated and covered with full jacketing.18
Advantages with RFID Wireless • • • • • • • •
Recorded temperature accuracy is +/- 1° F Data is available real time (right now) Constantly monitoring the In-Situ temperature Temperature monitoring can continue for years Data can be transferred, analyzed and archived Documents proof of quality assurance Eliminate concerns of weather problems Eliminate concerns of construction problems 19
Concrete of a given mix at the same maturity has the same strength, regardless of the temperature and time history that made up that maturity.
M1 Time
Hot Concrete Strength
Cold
Concrete Temperature
Concrete Temperature
CONCRETE
M2
Time
M1=M2=M
M Maturity (EA or TTF)20
Cost Advantages A construction project manager explained the savings on large projects this way; for every hour saved at the beginning of a project, multiple the times saved by six for total savings at the end of the project. 21
Cylinders & Beams What do they really cost?
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Transporting and handling Labor Intensive ?
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MATURITY TESTING Today The construction industry relies heavily on lab/field cured cylinder testing to determine strength of curing concrete.
Tomorrow With the advances in concrete maturity using established ASTM Standards - in-place concrete strength can be determined accurately in real time.
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Tag # 1 Lab Cured Cylinder Tag # 2 Field Cured Cylinder Tag # 3 – 6 Embedded in-place Concrete
Comparison of Strength Gain for First 3 days 6000
Strength - PSI
5000 1 2 3 4 5 6
4000 3000 2000 1000 0 0
1
2
3
Curing time - Days 25
The use of concrete maturity will allow you to launch major gains in the completion of your projects, assuring you are maintaining the quality your customer requires, while providing the level your firm wishes to deliver.
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“The use of RFID is a highly innovative method to take the science of concrete to a new level�.
This is precisely why we received the very prestigious 2004 NOVA award, presented by The Construction Innovation Forum (CIF). 27
For further information on our Concrete Maturity Monitoring System
WAKE, Inc. Sturgis, Michigan 800-588-6393 Contact: Richard Yesh
email - ryesh@wakeinc.com 28