Abstract
In this study, the effects of hydroxyethyl methyl cellulose ether (HEMC) content and molecular chain on rheological characteristics and hydration kinetics of Ultra-High Performance Concrete (UHPC) with high thixotropy are detailed investigated. The results showed that with an increase of HEMC content, the air content of UHPC can be increased, and the mechanical properties and durability of UHPC could be simultaneously deteriorated. In addition, although a higher air content may reduce the mechanical properties and durability of UHPC, the added HEMC with longer molecular chain is also helpful to increase the yield stress by 312.2 % and decrease the plastic viscosity by 46.5 % for UHPC slurry, which is important to improve the spray-ability of UHPC. At the same time, the HEMC with short molecular chain can reduce the early autogenous shrinkage of the UHPC by about 30 %, which is also important to improve the volume stability of sprayed Ultra-High Performance Concrete (SUHPC). Therefore, in practice, to develop a SUHPC with advanced properties, the type and content of HEMC should be well chosen by simultaneously considering the requirements of rheological properties, mechanical properties and durability at least.
Published Version
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