NDLI: Mixing of high performance concrete: effect of concrete composition and mixing intensity on mixing time

Content Provider	Springer Nature Link
Author	Mazanec, O. Lowke, D. Schießl, P.
Copyright Year	2009
Abstract	At present the use of ultra high performance concrete (UHPC) is limited to a small number of special applications. This is essentially due to the time needed to blend the UHPC mix which is considerably longer than required for ordinary concrete. The present investigations aimed at the determination of the composition features which result in the longer mixing time of UHPC. The individual components of the concrete mix (silica fume, quartz flour, water, superplasticizer and coarse aggregate) were systematically varied in order to investigate their effect on the mixing time needed to achieve optimal flow properties. Besides concrete composition, the effect of mixing tool speed was considered. The shortest necessary mixing time (stabilisation time) was calculated from the evolution of the power applied to the tool during mixing. It was confirmed that high w/c values resulted in short stabilisation times. In addition, the contents of silica fume and quartz flour as well as the type of cement and superplasticizer affected the stabilisation time significantly. It was possible to describe the effect of the individual variables in terms of the relative solid concentration ϕ/ϕ$_{max}$ which depends on concrete composition. This is the ratio of the actual volumetric concentration of solids in the concrete mix ϕ to the maximum possible concentration of solids ϕ$_{max}$ calculated from the volumes of particles (particle size distribution). The relative solid concentration is the basis of a model for the calculation of the mixing time of UHPC of a given composition and for given tool speed. High tool speeds and low actual concentrations of solids shorten the stabilisation time.
Starting Page	357
Ending Page	365
Page Count	9
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	43
Issue Number	3
e-ISSN	18716873
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-03-18
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	UHPC Mixing Mixing tool speed Mixing intensity Packing density Building Materials Civil Engineering Operating Procedures, Materials Treatment Theoretical and Applied Mechanics Materials Science Structural Mechanics
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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