The Importance and Applications of Temperature Measurement in Concrete
Ensuring Optimal Concrete Strength with Temperature Monitoring
Like with many other materials, concrete can change in quality as a result of its temperature. This can be especially important when there are certain temperature extremes where concrete is being poured.
Concrete has to be relatively warm for it to set and cure properly. It needs to be at least 40 degrees Fahrenheit while poured and at least 50 degrees when it is in the curing stage. The demands for a supportive environment are so strict that sometimes an outside heating source might be required to project warm air near the concrete during cold weather conditions.
A typical mass concrete mixture will generate heat as a results of hydration process. This process involves the water within the cement moving around and being used up. This will create the heat that is required for concrete to thrive, but it still needs to be kept in a temperature where this process can actually be sustainable.
The concrete mixture must be analyzed carefully so it will solidify and stay strong for years to come. Concrete that is not set properly may have a hard time with solidifying and can end up having very poor quality.
This shows the importance of measuring the temperature of concrete. A temperature monitoring device can help you out in cold and hot weather conditions to protect the concrete (surface).
We at Giatec Scientific have created a unique product called the Giatec SmartRock™. This is a wireless sensor and logger that will help you measure the temperature of concrete. The temperature history can be used to calculate the maturity index of concrete, enabling the user to predict the early age compressive strength.
What are the Applications?
Temperature sensors can be used at different stages of a concrete construction project. They can be used to get real-time readouts of the temperature in concrete. The temperature data can be used to get information on how well concrete is getting cured (or setting).
A wireless temperature sensor can be embedded in the concrete to review the temperature in a specific spot. Specifically, a wireless sensor can be installed within the concrete formwork in your installation area. It typically has to go on the rebar to increase the range of wireless signal.
This wireless sensor is then linked up to an appropriate device (logger) that will wirelessly read the information. You can then transfer these readings to a computer. A modern sensor like the Giatec SmartRock™ can directly send the information to your smartphone or tablet.
The measurements of the temperature in the area and the concrete that is being applied will be recorded in real-time by the original sensor. The data will be stored in the memory of the sensor. A mobile app is used to review the history of temperature variations in concrete. The data can be used to study the hardening process of concrete.
The temperature monitoring can be used for monitoring the variation of temperature on the surface of concrete, especially in the cold season, or to study the strength development in concrete. The latter is based on the maturity method, and can be used to predict the early age strength of concrete.
One important application for temperature sensors is to decide when covering concrete surface is necessary, or when it is safe to remove the coverings. Another important application is to decide when it is safe to open the formworks or shorings in a construction project.
How Does a Temperature Sensor-Logger Work?
The temperature sensors will typically work in many extreme conditions and can easily handle temperature values of up to 170 degrees Fahrenheit (as is the case for mass concrete foundations, retaining walls, or dams). However, the sensor will have to be buried in appropriate locations, and key structural components.
A reader is used to collect the temperature data. A traditional reader requires a wired connection to the sensor to retrieve the data. This can be done using Bluetooth technology for the case of Giatec SmartRock sensor. The wireless sensor should be places within the 3 to 4 inches distance from the surface. This will ensure that the signal strength is powerful enough to be detected by smartphone or tablet. A mobile app will help the user to find and locate the sensors, and connect to them. It is also used to retrieve the test data from the sensor and analyze the results.
The sensor collects temperature sensor in certain time steps (normally 30 minutes or less). This should be good enough as it can take a bit for the temperatures in your concrete to change rather substantially. Still, when used properly, it should not be much of a challenge for your app to give you the most accurate forms of analysis possible.
Contact Giatec for Help
Giatec Scientific provides a continuous technical support for SmartRock sensor. You can always get in touch with Giatec when you need assistance with installing the sensors, collecting the data, and analyzing the test results. Giatec SmartRock is a unique sensor that can be easily used in various construction projects.
SmartRock is designed based on Bluetooth 4 LE technology for an enhanced data management experience. The SmartRock senor is rugged and waterproof. The mobile app provides a user friendly and intuitive environment to collect the data, view test results, and share them.