STABILIZED SETTING AND HARDENING ACCELERATOR OF LOW VISCOSITY

摘要

Described are liquid setting and hardening accel-erators for hydraulic binders and such binder comprising mix-tures that preferably are alkali-free and chloride-free and that do not comprise any basic features. The setting accel-erators comprise as components aluminum salts, complexing agents, corrosion inhibitors and optionally inorganic and/or organic thickening or thixotropic agents. In comparison with the use of alkaline accelera-tors, an essential reduction in the setting time and a faster development of high compressive strengths is achieved by the accelerators of the present invention. In comparison with commercially available alkali-free accelerators solid pre-cipitates of aluminum salts and thereby generated plugging up of the spray nozzles is avoided and the corrosion at the spraying devices is eliminated. Said advantages result in a great economic advantage due to less maintenance needed for the devices and less interruptions of work.