We’ve answered the questions about COMMAND Center and concrete temperature and maturity monitoring we hear most often.

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COMMAND Center Cloud

How do I move my projects to the COMMAND Center Cloud from Dropbox?

The COMMAND Center Cloud is replacing Dropbox as a robust and easier to use file sharing and syncing method. The process for moving your projects depends on how many people and devices you are syncing files with.

  • If you do not share a Dropbox account with other users and want to keep your current projects
  • If you currently share a Dropbox account with multiple people on multiple iOS devices
  • If you do not need the projects currently located in your COMMAND Center iOS app

Click here for a step-by-step guide of how to move your projects.

How do I create a COMMAND Center Cloud account?

  1. Open the COMMAND Center iOS app.
  2. Tap settings.
  3. Turn the COMMAND Center Cloud switch on.
  4. Tap sign up.
  5. Enter an email and create a password. You must use a real email address.
  6. Tap sign up to complete process and log in.

How do I use the COMMAND Center Cloud to share my project with other users?

  1. Open a project.
  2. Tap share.
  3. Tap invite.
  4. Enter the email for the person you want to share that project with. Be sure the email you use is the email that person used to create their own COMMAND Center Cloud account.
  5. Select how you want to share the project:
    1. Full access – the other user can view/edit the specs of the project, create reports from the project, and share the project to additional users.
    2. Limited access – the other user cannot access the specs or share options within the project.

How do I accept an invitation to a shared project?

  1. Tap invitations at the bottom right of the project window.
  2. Tap accept or decline for each project shared with you.

How do I leave a shared project?

  1. Swipe left on shared project in project list.
  2. Tap leave.

How do I share a project from my iOS device to my Windows computer?

  1. Open the project.
  2. Tap share.
  3. Tap report.
  4. Select ‘export project via email’
  5. Tap your preferred mail client.
  6. Enter your email address and send.
  7. On your windows device, open your email that includes the COMMAND Center attachment (.pc2 file).
  8. Copy and paste the .pc2 file to your desktop.
  9. Be sure to have the Windows software
  10. Double click the .pc2 file to open.

How much does the COMMAND Center Cloud cost?

The COMMAND Center Cloud is completely free for unlimited users.

Can I use the COMMAND Center Cloud if I don’t use COMMAND Center AutoCollect?

Yes, the secure COMMAND Center Cloud works with or without our AutoCollect option, allowing teams to sync project files automatically across multiple devices and protect files with user privileges.

COMMAND Center Sensors

How often do the concrete sensors take readings?

We configure the sensor to measure concrete temperatures at any time interval required (usually specified by the customer). Once a sensor reaches its internal capacity of 2,048 total temperature readings, new data will continue to be collected but will roll over and overwrite the oldest data. However, you will never lose collected data as long as you save the sensor file within COMMAND Center software.

For example, if the sensor needs to measure the concrete temperature every 30 minutes (as required for concrete maturity applications per ASTM C 1074), then the sensor will hold about 42 days of consecutive temperature readings taken 30 minutes apart. If you save the sensor data in COMMAND Center software before 42 days, you will not lose any data. You could monitor and store a sensor’s data for years if you needed to!

When buying COMMAND Center Sensors, you specify which measurement interval you’ll need for your project, from 1 to 255 minutes. If you have questions as to what time interval to choose, we can help!

Can I change my COMMAND Center sensor data interval after I receive it?

In most cases, the specified interval is known when the order is placed so that we can set them accordingly.  In rare cases where the user needs to change the data interval of a sensor, there are two options:

  1. Send the sensor(s) back to us at COMMAND Center, where we can re-program your sensor to the new preferred interval. In most cases we will ship back your sensors the same day they are received, and at no additional shipping cost.
  2. Contact us to discuss the option of purchasing our COMMAND Center USB Download Cable and additional free software in order to re-program your sensors using your own Windows device.

Do the concrete sensors have to be initialized during construction?

No. COMMAND Center was designed to minimize interruption with construction activities. Therefore, the sensors are already fully functional when they arrive. You only need to note the time when concrete covers the maturity sensor, although it is possible to extract this time from the concrete temperature record.

When many sensors are installed, and/or when AutoCollector is in use, it is usually necessary to set up a project in the COMMAND Center iOS app before installation, so that sensors can be identified in the app and known by the COMMAND Center Cloud previous to installation in the concrete.

How do I read the concrete sensors?

COMMAND Center offers multiple options for data collection to fit your project needs.

  1. COMMAND Center AutoCollect
    COMMAND Center AutoCollect uses a cellular signal to automatically send your concrete data to the COMMAND Center Cloud, where teams can access it in real-time from anywhere using their iOS device. COMMAND Center AutoCollector reads sensor data through a direct connection to sensors or by Bluetooth connection to AutoCollect-Enabled SRMs.
  2. COMMAND Center Bluetooth
    COMMAND Center Bluetooth uses a Sensor Reader Module (SRM) to transmit sensor data on-site to the free COMMAND Center iOS app via Bluetooth or stores locally for later transfer.
  3. COMMAND Center Wired
    Use a serialor USB download cable to connect sensors directly to a Windows PC, laptop, or tablet to access your data in the COMMAND Center for Windows software.

Once sensor data is downloaded, you can view and analyze it using free COMMAND Center software. Data can be transferred seamlessly between devices.

What is the accuracy of the concrete sensors?

COMMAND Center sensors have an accuracy of ±1 °C (1.8 °F), meeting the criteria of ASTM C1074.

Do the concrete sensors have to be connected to anything during curing?

No, COMMAND Center Sensors are self-powered and self-contained—they’ll automatically be collecting and storing your concrete’s temperature and maturity data as soon as they are covered by the concrete. Whenever you want to read the sensor data, you will need to connect to the sensors using a COMMAND Center compatible device.

If you are using COMMAND Center AutoCollect, sensors must be left connected to an AutoCollector and/or AutoCollect-Enabled SRM so data can be automatically collected and sent to the COMMAND Center Cloud.

If you are using COMMAND Center Bluetooth, you have the option of leaving the SRM connected to the sensor so data can be retrieved wirelessly and repeatedly from a distance, if this allows for increased efficiency and/or safety during on-site data collection.

Temperature and Maturity Monitoring

Do I need a separate system to track concrete temperatures?

No, COMMAND Center’s single sensor records both temperature and maturity data, and all COMMAND Center software reads both temperature and maturity data. No other kinds of sensors,  software, or hardware are needed.

Which graphical method does COMMAND Center use when making concrete maturity curves?

COMMAND Center allows the user to choose between a semi-log fit specified by the Iowa and Texas DOTs or a sigmoidal relationship used by the FHWA HIPERPAV program.

Which concrete maturity method does COMMAND Center use?

COMMAND Center uses the Nurse-Saul and Arrhenius methods.

Isn't it more expensive to monitor maturity and temperature?

Maturity and temperature monitoring do require an upfront cost. However, contractors, owners, and engineers who use maturity frequently save money on their projects, because maturity can speed project schedules, reduce the risk of reconstruction caused by inferior concrete, and decrease the need for costly concrete repairs over the lifetime of a project.

Read about how The Beck Group used COMMAND Center to lower a project budget by $3 million in Dallas, Texas.

Maturity’s advantages can far outweigh the costs associated with it. Adding maturity to traditional testing can increase safety, expedite construction schedules, and improve construction methods.

How are maturity sensors used in concrete strength testing?

The maturity method doesn’t take the place of laboratory testing requirements for strength. Instead, construction teams monitor concrete maturity in addition to breaking cylinders or beams according to standard test procedures, although in many cases the number of breaks can be reduced over the course of a project by implementing maturity.

Maturity monitoring is implemented to verify standard testing and to estimate in-place concrete strength in real-time strength at the jobsite. The advantage: calculate strength at the job site instead of waiting for standard testing intervals, and increase quality control and assurance with strength verification.

Once standard strength tests have been completed, the maturity method uses that test data to calculate a strength-maturity relationship and a maturity curve for the specific concrete mix. This mathematical relationship allows you to use maturity as an indicator of your in-place concrete’s strength. Simply track your concrete’s maturity by placing sensors in your concrete at the job site—then read the sensor at any time to receive an estimate of your concrete’s strength based on the established strength-maturity relationship for that mix.

Even when the maturity method is being implemented on a project, concrete samples are also tested throughout construction in order to validate the maturity curve.

Learn more about the specific tests that will be conducted during construction on a project using COMMAND Center maturity monitoring.

What laboratory testing do I need to conduct when implementing the maturity method?

You’ll conduct two rounds of strength tests (compression or flexural) on concrete specimens in a lab. In the first round, you’ll use the data to develop your concrete mix’s maturity curve. In the second round, you’ll use the data to verify your concrete mix’s maturity curve while your in-place concrete is curing on the job site.

Your first strength tests allow you to develop a calibrated maturity curve that graphs the relationship between temperature, time, and strength for your project’s concrete mix design. If you will use multiple mix designs on a project, you will conduct tests and develop a maturity curve for each mix. Each maturity curve is specific to each mix’s unique combination of materials and proportions.

Testing should follow standard methods such as ASTM International C 1074: Standard Practice for Estimating Concrete Strength by the Maturity Method. In summary, ASTM C 1074 works like this:

  • A trial batch of the desired concrete mix design that will be used in the structure, pavement, or slab is prepared.
  • The mix is poured into a series of test specimens (cylinders or beams).
  • Temperature-monitoring sensors are inserted into two of these specimens.
  • The specimens are all cured in the same manner, typically in a water bath or moist room.
  • While curing, the temperature sensors are read and maturity data is calculated by software.
  • Specimens that do not contain the sensors are periodically broken and tested for strength at ages of interest.
  • A relationship between maturity and strength is established, and together this data is used to estimate the strength of the field concrete.

These laboratory tests are conducted prior to construction. You’ll develop your concrete mix’s calibrated strength-maturity curve in the lab, and then you’ll use that relationship to evaluate your in-place concrete at the job site.

Subsequent strength tests take place during construction and allow you to verify your concrete mix’s maturity curve. This testing is part of regular concrete construction: specifications for quality control and acceptance on any concrete project require you to cast concrete specimens and conduct compression strength tests at regular intervals during construction. When using maturity, you’ll add one extra step to this standard procedure: embed a sensor into one of the specimens to monitor its temperature over time. Evaluate your maturity curve by comparing the specimen’s maturity data with strength data from your strength tests. If a specimen breaks within a 10% deviation of the strength predicted by the maturity data, the curve has been verified.

Using the maturity method is not a replacement for traditional testing methods, but it can reduce the number of extra cylinders cast for traditional tests. Most specifications require construction teams to cast specimens in the field, cure them in ideal conditions, and then conduct compression strength tests at specific time intervals. Construction teams will commonly cast extra specimens for these tests because often several specimens must be discarded due to unexpectedly low strengths. Maturity decreases the chance of these discards—if a temperature sensor is embedded in the specimen, construction teams can determine its strength by reading the sensor data and determining strength from the maturity curve instead. This prevents construction teams from conducting a strength test on a specimen before enough strength is gained. By preventing discarded specimens, they can reduce the number of extra specimens needed for testing.

COMMAND Center System

What do I need to buy to use COMMAND Center?

COMMAND Center buyer's guide.Download the buyer’s guide.

COMMAND Center Sensors are a required purchase for every project. COMMAND Center software and iOS app are completely free. We have multiple options for data collection to fit your project needs and the hardware you must purchase depends on the option you choose:

  1. COMMAND Center AutoCollect – Automatically transmit data wirelessly to the COMMAND Center Cloud. Requires the purchase of a reusable AutoCollector and optional AutoCollect-enabled SRMs.
  2. COMMAND Center Bluetooth – Transmit data on-site wirelessly via Bluetooth. Requires the purchase of a reusable Sensor Reader Module (SRM).
  3. COMMAND Center Wired – Connect a Windows device directly to sensors to retrieve data. Requires the purchase of a USB or serial download cable.

Still not sure what you need? Contact us online or by phone to discuss your project needs: +1 (888) 451 6233

How do I buy COMMAND Center?

If you’re interested in purchasing COMMAND Center, you can buy any of our products online or call us at +1 (888) 451 6233.

Is COMMAND Center data secure?

Yes, COMMAND Center data files are encrypted and all PDF reports generated in COMMAND Center for Windows software are secure.

Can I still use a Trimble Nomad to collect sensor data?

Yes!  The Trimble Nomad is still an excellent and durable device for COMMAND Center data collection, and existing users are encouraged to continue using it if they wish. While we no longer sell Trimble Nomads, the device remains compatible with the COMMAND Center system. You can still download COMMAND Center for Windows Mobile software for free and we continue to offer training and technical support for data collection with a Trimble Nomad. Contact us with compatibility questions or for help setting up your Trimble Nomad or other Windows Mobile device.

Is COMMAND Center an embedded or non-embedded system?

COMMAND Center’s Bluetooth and cellular data transmitters (SRM and AutoCollector) are non-embedded, meaning they sit outside of the concrete. That means they are reusable, less expensive, and have a better and more reliable signal range than embedded transmitters.

Learn more about embedded and non-embedded concrete temperature and maturity systems.

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Do you have a question we haven’t answered here?

Call us at +1 (888) 451 6233 or send us a message.