Document Type Master's Dissertation Author Pretorius, Jan Hendrik Christoffel URN etd-07082005-135427 Document Title The influence of PFA particle size on the workability of cementitious pastes Degree MSc (Transportation) Department Civil and Biosystems Engineering Supervisor
Advisor Name Title Prof E P Kearsley Keywords
- particle size determination
- cement composites
- fly ash
Date 2003-04-01 Availability unrestricted AbstractIn this dissertation the effects of different types of Pulverized Fuel Ash (PF A)-types on the workability of cementitious pastes containing relative large amounts of PF A were investigated. The different types of PF A were produced at the same source thus they were chemically similar but differed in terms of average particle size and size distribution (grading). By using a two-point measurement technique based on flow through a J-shaped tube it was possible to detect relative small differences in workability between pastes. It was found and concluded that the different types of PFA had a significant effect on the workability of pastes containing cement and PFA as well as PF A alone.
The physical differences between the PF A-types were quantified and their effects on workability investigated. It was concluded that PF A with a broader particle size distribution range produced pastes with higher workability at constant water content. It was found that compressive strength as measured after 28 days were solely a function of the water/cementitious ratio for the curing regime employed. It was concluded that for curing conditions used the type of PF A used could have a significant effect on compressive strength when constant workability is required.
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Please cite as follows:
Pretorius, JHC 2002, The influence of PFA particle size on the workability of cementitious pastes, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-07082005-135427/ >
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