Influence of Fly Ash on Slump Loss and Strength of Concrete Fully Incorporating Recycled Concrete Aggregates
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 2
Abstract
This paper investigates the effects of fineness and replacement of fly ash on the fresh and hardened properties of recycled aggregate concrete. Two groups of recycled aggregate concretes were studied and compared with that of conventional concrete (CON) in which crushed limestone and local river sand were used as aggregates. The first group was prepared using 100% coarse recycled concrete aggregate and local river sand. For the second group, crushed limestone and local river sand were fully replaced by both coarse and fine recycled concrete aggregates. The results indicate that the slump loss of the recycled aggregate concrete with fly ash was reduced to lower than that of the recycled aggregate concrete without fly ash when the fineness of the fly ash was increased, which increased the slump loss of the fresh concrete. Fly ash can be used to increase the compressive strength of recycled aggregate concrete, depending on its fineness and the degree of fly ash replacement. The addition of fly ash with different fineness in recycled aggregate concrete had no significant effect on the splitting tensile strength and the modulus of elasticity of the recycled aggregate concrete, which are related to its compressive strength.
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Acknowledgments
The authors gratefully acknowledge financial support from the Thailand Research Fund (TRF), the Commission on Higher Education (CHE), Ministry of Education, and King Mongkut’s University of Technology Thonburi under the TRF-CHE Research Grant for New Scholars, Grant No. MRG5480180, from the Thailand Research Fund under the TRF Senior Research Scholar, Grant No. RTA5380002, and from King Mongkut’s University of Technology Thonburi under the National Research University (NRU).
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 2 • February 2013
Pages: 243 - 251
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Sep 7, 2011
Accepted: May 22, 2012
Published online: May 24, 2012
Published in print: Feb 1, 2013
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