Sprayable, structurally dense lightweight concrete: Concrete engineering

摘要

Cement-aggregate mixtures have been sprayed for well over 100 years. Developments in process and concrete engineering made since that time enable shotcretes to be processed re-liably today in both dry and wet spraying processes. The shotcretes, or spray mortars, are ap-plied and compacted at high speed, with rebound having to be limited. Non-alkaline setting accelerators and special shotcrete cements are used in order to improve the setting and hardening behavior , which requires an analysis of their interactions with the plasticizers to be used and the composition of the aggregate mixtures.