Combined Heat Treatment Method for Producing of Ultra-High Performance Concrete

Abstract

Decreasing an overall time of curing for UHPC products is a perspective task that can be solved by combining different heat treatment technologies. The paper presents the results of studying the UHPC microstructure after combined steam and non-steam heat treatment. Concrete specimens after demolding were steam cured for 16 hours, than – in oven camber. Heat treatment in oven chamber for 8 hours under temperature 250 ̊С leads to micro-defects self-healing, due to the new crystalline phase formation. The combined heat treatment allows unleashing of additional potential of UHPC mixes, which could take years in normal conditions The considered curing method with further treatment in oven can not only accelerate the process, but also unleash the additional part of UHPC pozzolanic potential for different mix compositions.