The influence of PFA particle size on the workability of cementitious pastes

• Main Author: Pretorius, Jan Hendrik Christoffel
• Other Authors: Kearsley, Elsabe P.
• Published: University of Pretoria 2013
• Subjects: Particle size determination; Cement composites; Fly ash; UCTD
• Online Access: http://hdl.handle.net/2263/26113; Pretorius, JHC 2002, The influence of PFA particle size on the workability of cementitious pastes, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/26113 >; http://upetd.up.ac.za/thesis/available/etd-07082005-135427/

In 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. === Dissertation (MSc (Transportation))--University of Pretoria, 2006. === Civil Engineering === unrestricted