Influence of Humic Acid on the Strength Behavior of Cement-Treated Clay during Various Curing Stages
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 8
Abstract
Marine dredged clay may contain various types of organic matter that affect the properties of cement-treated clay. Organic matter in soils can be classified into two categories: nonhumic and humic. This work aims to evaluate the effects of humic acid on the strength development and microstructure of cement-treated marine clay with various curing times ranging from 5 h to 90 days. Strength development was investigated through a vane shear and unconfined compression tests with different water, cement, and humic acid contents. The microstructure was examined by X-ray diffraction and scanning electron microscopy. The results indicate that the strength development was governed by the cement and humic contents. Further, a threshold cement content, at which the adverse effects of humic acid on strength development are overcome, existed for a given humic acid content. Finally, a new compound was observed to form when humic acid was added to cement-treated clay.
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Acknowledgments
This work was financially supported by the Scientific Research Fund of the Ministry of Education, Culture, Sports, Science and Technology Research (No. 25289146). The authors are grateful to Professor Watabe of the Hokkaido University, Dr. Tanaka, and Dr. Kaneko of the Port and Airport Research Institute in Japan for their assistance during the SEM experiments.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 8 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jul 11, 2016
Accepted: Dec 14, 2016
Published online: Mar 30, 2017
Published in print: Aug 1, 2017
Discussion open until: Aug 30, 2017
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