A study of multiple effects of nano-silica and hybrid fibres on the properties of Ultra-High Performance Fibre Reinforced Concrete (UHPFRC) incorporating waste bottom ash (WBA)

•Waste bottom ash (WBA) is applied in UHPFRC.•Modified Andreasen and Andersen particle packing model is used to design UHPFRC.•Multiple effects of nano-silica and hybrid fibres on the properties of UHPFRC are analyzed.•Cement hydration process of UHPFRC with and without WBA is investigated.•Effect o...

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Bibliographic Details
Published in:	Construction & building materials 2014-06, Vol.60, p.98-110
Main Authors:	Yu, R., Tang, P., Spiesz, P., Brouwers, H.J.H.
Format:	Article
Language:	eng
Subjects:	Analysis Chemical properties Concrete Hybrid fibres Mechanical properties Multiple effects Nano-silica Porosity Silica Ultra-High Performance Fibre Reinforced Concrete (UHPFRC) Waste bottom ash (WBA)
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Summary:	•Waste bottom ash (WBA) is applied in UHPFRC.•Modified Andreasen and Andersen particle packing model is used to design UHPFRC.•Multiple effects of nano-silica and hybrid fibres on the properties of UHPFRC are analyzed.•Cement hydration process of UHPFRC with and without WBA is investigated.•Effect of the WBA on the microstructure development of UHPFRC is presented. This article addresses the multiple effects of nano-silica and hybrid fibres on the properties of an Ultra-High Performance Fibre Reinforced Concrete (UHPFRC) incorporating waste bottom ash (WBA). The design of the concrete mixtures was based on the aim to achieve a densely compacted matrix, employing the modified Andreasen and Andersen particle packing model. The workability, porosity, flexural and compressive strengths of the UHPFRC are measured and analyzed. The results show that due to the existence of the metallic aluminium particles in WBA, the generated hydrogen can cause some visible macro-cracks in the concrete, which could reduce the mechanical properties of the concrete. However, with a simultaneous utilization of nano-silica and hybrid fibres (steel and polypropylene fibres), the negative influence from the WBA can be effectively minimized and the flexural strength of the UHPFRC can be improved.
ISSN:	0950-0618 1879-0526