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.
The paper reveals the possibility of using the almost impermeable structure of ultra-high-performance concrete (UHPC) for heat treatment at temperatures above 100 °C as an alternative to autoclaving, while achieving similar physical and mechanical characteristics.
The work provides the results of experimental investigation of strain properties of steel-fiber reinforced concrete with high-strength cement-sand matrix and various content of fiber (up to 6% by volume). The work demonstrates influence of the type and content of steel fiber over changes of characteristics of complete diagrams of strain under axial tension. It shows that introduction of fiber gives elastic properties to the matrix that (properties) in a greater degree depend upon the type of fiber than upon percent of fiber reinforcement.
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