Formwork & Falsework International Vol 2 No 1
Doka Concremote - online measurement of concrete-strength in real time
The Austrian formwork company, Doka, has introduced more technology to the job site with its innovative Concremote system.
Concremote determines fresh concrete-strength development on the structural element to help speed up the construction processes and increased safety.
A key parameter affecting the construction workflow is the development of compressive strength and hydration heat of concrete during construction. Stripping and curing times and the time for prestressing are all calculated based on concrete-strength development, for instance.
Heat development measurements are important for monitoring stresses in the component that develop as a result of temperature variances. It helps avoid cracks and future structural damage.
Based on measured concrete-strength values, Doka Concremote concrete monitoring enables users to determine the steps to be taken and thus ensure and optimise the construction process.
The trend towards industrialisation of building processes has been evident for some years as more an more processes benefit from close monitoring that modern technology makes possible. However, some measurements are still determined obtained by testing laboratories, manually and at great labour costs. These are becoming fewer as automated processes take over.
Concremote makes an active contribution in this regard.
Usually construction companies determine concrete strength by means of general target values and/or complicated testing methods. The Doka Concremote makes it easier as it combines the established weighted maturity method with modern measuring and information technology.
By incorporating sensor placement into the casting process, the system measures concrete strength by way of heat development. There is no need for a person to be present on the site for reading and securing the measured data.
Sensors measure temperature development of the fresh concrete at regular intervals and transmit these data to a computing centre. Here, the weighted maturity method is used as the basis for calculating and providing reliable information on the strength development of the concrete in real time.
Concremote uses two types of sensors: slab sensors, which are inserted in the fresh concrete after it has been screeded and cable sensors that are incorporated directly into the form-ply of the wall formwork and repositioned together with the formwork.
Wireless transmission of the measured values starts automatically. The system’s life-long batteries, sturdy sensors and wireless data transmission make it highly user-friendly reliable and able to withstand the harsh environment.
Measuring results can be accessed at any time on a secure web portal. Also, users can be alerted by e-mail or text-message as soon as the specified early strength has been reached.
The systems offers wide-ranging possibilities for optimizing the construction process: if a customer has entered a specific target value for a site, the strength values enable him to make precise recommendations regarding e.g. the earliest times for stripping the formwork, climbing and prestressing, and for the end of curing. The real-time measured data can also be taken into consideration for optimizing the concrete formulation.