Extrudable reactive powder concretes: hydration, shrinkage and transfer properties

The behaviour of five reactive powder concretes (RPC), with four of them being extrudable, has been studied from the first minutes up to more than 90 days. The extrusion force, hydration rate, free autogenous shrinkage at early age, mechanical properties and durability parameters were measured. The performance analysis showed the benefits of a partial substitution of silica fume with crushed quartz on the RPC properties. The cost/performances analysis highlighted that the main advantage of using RPC lies in their potential of durability, which is 10 to 100 times higher than that of ordinary or high-performance concretes, according to the property considered. Le comportement de cinq betons de poudres reactives (BPR), dont quatre presentent des proprietes d’extrudabilite, a ete etudie depuis les premieres minutes apres leur fabrication jusqu’a plus de 90 jours de maturation. La force d’extrusion, la cinetique d’hydratation, le developpement du retrait endogene libre au jeune âge, les proprietes mecaniques e...