Microstructure and Shrinkage Behaviour of Massive Concrete Containing PFBC Coal Ash

Title: Microstructure and Shrinkage Behaviour of Massive Concrete Containing PFBC Coal Ash
Author(s): Nakashita
Paper category : conference
Book title: International RILEM Conference on the Use of Recycled Materials in Building and Structures
Editor(s): E. Vázquez, Ch. F. Hendriks and G.M.T. Janssen
Print-ISBN: 2-912143-52-7
e-ISBN: 2912143756
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 871 - 880
Total Pages: 10
Nb references: 6
Language: English

Abstract: An experimental investigation is carried out on the effect of PFBC coal ash and high
temperature on microstructure and shrinkage behavior of concrete containing PFBC coal ash
(PFBC concrete). The major parameters adopted in the present study are concrete temperature
at early age, water-to-binder ratios (W/B) and PFBC coal ash replacement ratios, respectively,
in which the concrete temperature simulates that due to hydration heat generated in massive
concrete.
Experimental results showed that early-age strength of PFBC concrete until the age of 3
days was improved when W/B was 0.3, corresponding to microstructure which became denser
as temperature rose. PFBC concrete showed compressive strength approximately similar to
that of plain concrete under 60 and 80 . independent of W/B except for the replacement ratio
of 50%, while that showed the marked rate of increase even at the age of 365 days when W/B
of 0.30 and exposed to 20 ..
Effectiveness in reducing shrinkage strain and its induced stress due to self-desiccation was
observed in PFBC concrete with W/B of 0.30 under 20 .. However, PFBC coal ash did not
necessarily contribute to reducing long-term shrinkage and its induced stress except for the
case of W/B of 0.30 under 20 ..

Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.096