Accelerated curing is used by precast/prestressed concrete producers to achieve high early-age compressive strengths. Accelerated curing is done with live steam or conduction through heated casting beds. Using this technique, it is not uncommon to produce over 5000-psi concrete in 14 hours.
Conductive heat systems were developed to help reduce the energy losses associated with steam. Computer-controlled systems can regulate all types of accelerated curing systems but are best-suited for electrically powered conductive systems. Automating the curing control system offers precasters more control, better information, and higher savings.
The computer controls the temperature of the casting bed with respect to time and can control the rate of change or hold the temperature at a set point. By inputting the desired time-temperature curve, the temperature can be constantly controlled for efficiency.