Microstructural study of concretes incorporating ceramic sanitary ware aggregate exposed to freeze-thaw cycles

Author(s): C. Medina, M.I. Sánchez de Rojas, M. Frías, A. Juan, J.M. Morán
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 613-621
Total Pages: 8
Language: English

The resistance of concretes to the action of freeze-thaw cycles is of particular importance in latitudes with cold, wet winters, since acceptable behaviour under these physical conditions translates into good durability throughout the service life of the material.
In the present study, a microstructural analysis was conducted of concretes made with aggregate containing crushed waste from the sanitary ware industry. The study focused on an assessment of the damage sustained by recycled concrete as a result of exposure to freezethaw cycles. The physical, mechanical and thermal characteristics of the recycled ceramic aggregate were determined to verify whether they complied with the requirements for coarse aggregates laid down in the standards presently in effect (Spanish Structural Concrete Code EHE-08 and European standard EN 12620). After this aggregate was found suitable for use in concrete production, the design mix was calculated and several concretes were prepared, progressively increasing the percentage of natural coarse aggregate replaced by recycled ceramic aggregate (0%, 20% and 25%). Mechanical strength was also determined before subjecting the experimental concretes to freeze-thaw cycles. The damage sustained by recycled concrete as a result of exposure to successive freeze-thaw cycles was then analysed. The loss of surface mass was determined and a detailed microstructural study was performed, focusing on an analysis of the (natural or recycled) coarse aggregate/paste interface and micro-fissures in the paste. The findings showed that the recycled concretes were slightly more resistant to changes in temperature, indicating that ceramic waste from the sanitary ware industry can be reused as coarse aggregate in concrete production, with the concomitant economic and environmental benefits that this entails.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00