Engineering Properties of Marine Clay Admixed with Portland Cement and Blended Cement with Siliceous Fly Ash
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 10
Abstract
This paper presents a laboratory study on the engineering properties of marine clay admixed with siliceous fly-ash-blended cement and ordinary portland cement (OPC) through an unconfined compression test, split tensile test, bender element test, and isotropic compression test. Specimens with 20–100% of cement by weight of dry soil and 100–133% of water by weight of soil and cement solid-cured for 7–150 days were investigated for both fly-ash–cement-admixed clay and OPC-admixed clay. The results showed that the short-term strength gain of marine clay admixed with fly-ash-blended cement (FAC) is significantly lower than that of OPC-admixed clay. However, the long-term strength gains are similar, with the fly-ash–cement-admixed clay manifesting more sustained gains for curing periods beyond 28 days. The difference in the rate of strength gain between FAC-admixed clay and OPC-admixed clay is attributed to the greater prominence of the pozzolanic reaction in the fly-ash-blended cement. In order to reflect the slower initial rate of strength gain arising from the pozzolanic reaction, a generalized hyperbolic strength-gain-time function was postulated for fly ash. By superimposing the individual strength contributions of the OPC and fly ash, a semiempirical relationship for the gain in strength with time for marine clay treated by fly-ash-blended cement is obtained, which gives good agreement with the measured data. Other properties studied herein include isotropic yield strength, tensile strength, and small-strain modulus. The results show that all these properties are well-correlated to the unconfined compressive strength by linear function regardless of whether OPC or fly-ash-blended cement is used.
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Acknowledgments
The authors would like to thanks for the comments of Prof. Zhang Min-Hong, National University of Singapore, during the preparation of the paper. The valued comments from the reviewers are gratefully appreciated. This research was supported by the National Research Foundation Singapore under its Competitive Research Programme (CRP award NRF-CRP 6-2010-03). The supply of fly-ash cement by Taiheiyo Cement Corporation is also gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 10 • October 2017
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©2017 American Society of Civil Engineers.
History
Received: Aug 11, 2016
Accepted: Mar 22, 2017
Published online: Jul 8, 2017
Published in print: Oct 1, 2017
Discussion open until: Dec 8, 2017
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