Title: Kinetics of UHPC Strength Gain at Subfreezing Temperatures
Author(s): Vasily Sitnikov and Ivan Sitnikov
Publication: Symposium Paper
Appears on pages(s): 117.1-117.8
Keywords: ultra-high-performance concrete, water-cement ratio, antifreeze admixtures, subfreezing hydration, cold weather concreting, strength gain
It is well-known that cooling of fresh concrete to a subfreezing temperature interrupts the structure formation and can lead to serious damages of constructions. Most of the existing antifreeze additives reduce this destructive effect, however it should be acknowledged that the processes of cement hydration is still interrupted to an extent that the strength gain in these conditions is simply negligible. When using these admixtures, it is merely expected that concrete will not lose its integrity during the phase of cooling and that strength will be gained after the ambient temperature will reach positive values. However, in our work we aim at proving the possibility of rapid strength gain of UHPC with reduced water-cement ratio even at subfreezing temperatures. The following article presents analysis of the influence of various in-house developed admixtures on kinetics of strength gain of UHPC at negative temperatures.