Highways and transportation · 1990 · 13 citations · 0 references
EngineeringCivil EngineeringBridge EngineeringBuilding MaterialsStructural EngineeringBridge MaterialsCementing OperationsCementitious MaterialsConcrete ConstructionCement Grouting MaterialsCementitious GroutsGrout DesignGroutingGroutsPost-tensioned ConcreteVoid GroutingVoids
A programme of work has been undertaken by the Transport and Road Research Laboratory (TRRL) to determine why voids form in the grouted ducts in post-tensioned concrete bridges and to investigate improved grouting procedures. This included a series of full-scale grouting trials. It is concluded that substantially void free grout can only be achieved by a carefully planned approach to the grouting operation. Essential pre-operational elements for successful grouting are identified and some of the limitations of current procedures are discussed. It is suggested that a water cement grout is unlikely to achieve the required properties without the addition of suitable admixtures. A reinjection method of decreasing the risk of large voids is described.(A)