Materials for roller compacted concrete used in modern dam construction

Conclusions

1. The high effectiveness of roller compacted concrete technology is proved by its wide use in world practice. In the world there are presently more than 160 dams more than 15-m high constructed by this technology. One of the reasons for the effectiveness of RCC is the use of various types of pozzolana additives to the cement clinker, which is confirmed by the experience of constructing more than 90% of the dams constructed.

2. Along with traditional pozzolana additives obtained from tripoli, diatomite, etc., fly ash and in its absence socalled rock flour, obtained at the construction site by crushing hard and soft rocks, have gained wide use. In this case it is important to study such an artificial pozzolana additive for a temporal change in its activity with respect to binding calcium hydroxide. The results of studies should be reflected in the technological requirements imposed on works with RCC.

3. On the basis of the data on the properties of RCC obtained in experiments, it can be concluded that there is no fundamental difference between ordinary and roller compacted concrete except that which is due to the presence in RCC of an increased number of contacts between concrete layers. Therefore, it is vitally important to study the properties of these contacts, which is confirmed by the large number of studies of the behavior of horizontal block joints carried out in the past decade for dams being planned and under construction.