Performance-based Temperature Difference Limit for Concrete (PBTDL)

How to use Performance-based Temperature Difference Limit (PBTDL) for the maximum difference in temperature between sensors



HardTrack supports the use of Performance-based Temperature Difference Limit (PBTDL) for verifying if the temperature difference between sensors in the concrete is within the calculated temperature difference based upon a predefined table that HardTrack uses to lookup the appropriate temperature difference based upon the concrete maturity, for example, TTF 

°C Maturity:


Measured
Maturity,
°C·hr		 Calculated
Equivalent Age,
days		 Fitted Compressive
Strength,
psi		 Temperature
Difference Limit,
°F
≤133
 ≤0.25
 ≤349
 23.9
200
 0.38
 480
 26
250
 0.47
 563
 27.2
300
 0.57
 638
 28.1
350
 0.66
 704
 28.9
400
 0.76
 765
 29.6
500
 0.95
 871
 30.7
600
 1.14
 964
 31.6
800
 1.52
 1124
 33.1
1000
 1.89
 1265
 34.3
1250
 2.37
 1427
 35.5
1500
 2.84
 1579
 36.6
1750
 3.31
 1722
 37.6
2000
 3.79
 1859
 38.5
2500
 4.73
 2115
 40.1
3000
 5.68
 2349
 41.4
4000
 7.58
 2759
 43.6
5000
 9.47
 3100
 45.3
6000
 11.36
 3386
 46.6
8000
 15.15
 3824
 48.4
10000
 18.94
 4129
 49.7
15000
 28.41
 4548
 51.3
22500
 42.61
 4760
 52.1
≥30000
 ≥56.82
 ≥4815
 52.3

Your PBTDL table can either be entered manually into HardTrack or you can send your table to Wake Customer Care and your PBTDL table will be electronically uploaded into HardTrack for you.

To enter your PBTDL manually,  open a HardTrack Project, select or create the concrete type for the project that is associated with your concrete mix, and click on the PBTDL from Maturity button:




Next, click on the Target Alerts button 



Click on Use PBTDL for Temp Diff All Sensors and Click OK
Note: With Performance-based Temperature Difference Limit calculated using Maturity, please make sure that the 1st Temp setting on this form is set correctly.  For example, we have it set to C for Celsius, because we are using TTF °C Maturity in our example.

Please remember to save you Concrete Type


When you are ready to export your Project Temperature Report, be sure to select these options, so that the PBTDL will be reported:

At a minimum:
1) Inside (MaxT - MinT)
2) MaxT Diff - PBTDL


Your Project Temperature Report will look similar to this:


If any of the temperature difference calculations exceed the PBTDL, you will see values in the (Min - Max) > PBTDL column:


Note: So that you do not have to create the PBTDL table for each concrete type for each HardTrack Project, either copy the Concrete Type from another project that has the PBTDL set up, or use SaveAs on a Project that has the PBTDL set up in a Concrete Type that you plan on using for your current Project.