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88. Thermal analysis of cement-fly ash pastes



Title: 88. Thermal analysis of cement-fly ash pastes
Author(s): G. Baert, N. De Belie, G. De Schutter, S. Hoste
Paper category : conference
Book title: 5th International RILEM Symposium on Self-Compacting Concrete
Editor(s): G. De Schutter and V. Boel
Print-ISBN: 978-2-35158-047-9
e-ISBN: 978-2-35158-088-2
Publisher: RILEM Publications SARL
Publication year: 2007
Pages: 583 - 588
Total Pages: 6
Nb references: 9
Language: English


Abstract: For a long time, fly ash has been used in small quantities in traditional concrete, but with the raise of self compacting concrete fly ash can be used in an equal portion as portland cement. When fly ash is used in such a large quantity, questions remain concerning how fly ash will interact with the hydration of cement and when the pozzolanic reaction will start to proceed. In this experimental program, isothermal hydration tests have been performed to study the influence of the type of cement, fly ash, water-to-cementitious material ratio and curing temperature. With increasing fly ash content, the cumulative heat per gram cement was increased. Depending on the type of fly ash and cement, a third hydration peak was noticed. A comparison with results and data from literature was made to explain the observations.
Thermogravimetric experiments were performed to determine the influence of fly ash on the chemically bound water and the free lime content. Compared to a paste with only portland cement, the amount of chemically bound water did not change, while the free lime content clearly first increased in the presence of fly ash and later on decreased.


Online publication: 2009-06-16
Publication type : full_text
Public price (Euros): 0.00