The Use of Fly Ash in Completely Recyclable Concrete

Title: The Use of Fly Ash in Completely Recyclable Concrete
Author(s): M. De Schepper, P. Van den Heede, N. De Belie
Paper category : conference
Book title: International RILEM Conference on Material Science
Editor(s): W. Brameshuber
Print-ISBN: 978-2-35158-110-0
e-ISBN: 978-2-35158-111-7
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 35 - 43
Total Pages: 9
Nb references: 19
Language: English

Abstract: The concept of completely recyclable concrete (CRC) has been developed to close the loop. By adequately incorporating limestone aggregates and industrial by-products, the chemical composition should resemble the composition of Portland clinker which enables the use of CRC as a raw material in Portland cement production. This paper investigates whether the chemical composition can be adjusted by partially replacing cement with pozzolanic fly ash. CRC mixtures were produced with 50% fly ash and 50% ordinary Portland cement or blast-furnace cement. At the age of one month laboratory clinker and cement were produced from the CRCs. The resulting cement had a low compressive strength and hydraulic reactivity caused by a high belite content, so corrections were necessary. It is concluded from this paper that cement with hydraulic properties can be produced from CRC, but the chemical composition of all used concrete materials needs to be known for recycling without modification.

Online publication: 2010-12-02
Publication type : full_text
Public price (Euros): 0.00