Pre-stressed concrete pavements
The pre-stressing technique is used now a day for the construction of road pavements. The pre-stressed pavement can be built-in continuous length up to 120 m. A width of 3.6 m is desirable and therefore longitudinal joints should be provided .
The minimum recommended thickness is 15 cm. A minimum value of 22 kg/cm² of pre-stress is recommended for 120 m long pre-stressed pavement. Pre-stressing is done by post-tensioning method.
The construction of pre-stressed concrete pavements is a difficult job and needs a skilled team. Any failure of the anchor could be very severe. The loss in pre-stressing due to sub-grade restraint is one of the major problems in prestressed concrete pavement construction.