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·hrCalculated
Equivalent Age,
daysFitted Compressive
Strength,
psiTemperature
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.
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