ABSTRACT
Workability of fresh non-dispersive underwater concretes differs very much from that of highly workable ordinary mixes. The underwater mix must posses a high degree of cohesion to reduce significantly the washout when in contact with water. Simultaneously, it must have a sufficiently high workability which guarantees a self-compaction when placed. Common workability tests such as the Slump test or the Spread/Flow test cannot diferentiate reliably between ordinary mixes and nondispersive underwater concrete. The Orimet test provides easy and reliable means of a rapid on-site identi-fication of a true non-dispersive underwater mix. It also shows an potential to provide an indirect measure Its washout resistance.
