Materials

Development of UHPC Using Ternary Blends of Ultra-Fine Class F Fly Ash, Meta-kaolin and Portland Cement

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Abstract

The influence of binary and ternary blends of pozzolans on properties of UHPC were studied in this investigation. The pozzolans included in this study include ultra-fine class F fly ash (UFA), Meta-kaolin (MK), and silica fume (SFU). The properties of UHPC investigated include workability, time of set, autogenous shrinkage, compressive strength and drying shrinkage of cementitious paste with water-to-cementitious materials ratio at 0.20. The test results on paste containing binary blend of pozzolans and cement showed that the increase in the SFU content resulted in significant decrease in the workability, decrease in the autogenous shrinkage and increase in the drying shrinkage of paste. The increase in the UFA content resulted in significant retardation in the setting behavior of paste, decrease in the 1-day compressive strength and increase in the drying shrinkage of paste. The increase in the MK content resulted in significant decrease in the workability and time of set, improved 1-day compressive strength, increase in the autogenous shrinkage and decrease in the drying shrinkage of paste. The test results on paste containing ternary blend of MK, UFA and cement showed that the combined use of MK and UFA compensated the reduction in the 1-day compressive strength and increase in the drying shrinkage of paste due to the use of UFA, and compensated the reduction in the workability of paste due to the use of MK. Ultra-high performance concrete was prepared by using properly proportioned ternary blend of MK, UFA and cement that achieved comparable performance with UHPC containing SFU alone.

Keywords: UHPC, ternary blend, silica fume, meta-kaolin, fly ash

How to Cite:

Rangaraju, P. R. & Li, Z., (2016) “Development of UHPC Using Ternary Blends of Ultra-Fine Class F Fly Ash, Meta-kaolin and Portland Cement”, International Interactive Symposium on Ultra-High Performance Concrete 1(1). doi: https://doi.org/10.21838/uhpc.2016.64