Performance of Two Bacteria-Based Additives Used for Self-Healing Concrete
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 12
Abstract
Bacteria-induced mineral precipitation is an environmentally friendly technology to enhance the self-healing ability of concrete cracks. However, the self-healing capacity of concrete was improved at the expense of extra bacteria-based additives incorporated into a concrete matrix, and the influence of bacteria-based additives on a concrete matrix has not been fully understood. The objective of this work was to investigate the effects of bacteria-based additives on the properties of a cement paste matrix. Two types of bacteria-based additives (Type 1 and Type 2) were developed to improve the concrete self-healing capacity mainly achieved by bacteria-induced mineral precipitations. The mineral precipitations induced by two types of bacteria-based additives in the liquid medium were analyzed with a scanning electron microscope (SEM) and X-ray diffraction (XRD). Then, the crack-healing capacity of cement paste specimens with both bacteria-based additives was evaluated on the basis of area repairing rate. Moreover, the mechanical and carbonate resistance properties of cement paste specimens were investigated in detail. Experimental results showed that both bacteria-based additives could be utilized to design a self-healing cementitious material system. Incorporation of the Type 1 additive into cement paste resulted in a decrease of about 14.7%, 6.8%, and 0.1% in compressive strength after 3, 7, and 28 days of curing, respectively. However, incorporation of the Type 2 additive into cement paste resulted in a decrease of about 1.6% and 2.2% in compressive strength after 3 and 7 days of curing, respectively, and an 8.1% increase after 28 days of curing. The carbonation depths of control specimens, specimens with Type 1 and specimens with Type 2 were 6.6 mm, 7.0 mm, and 6.5 mm, respectively, after 3 days of accelerated carbonation. These results suggested that the two types of bacteria-based additives could be used to design a self-healing concrete system, though a slight compressive strength loss in early curing age was found.
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Acknowledgments
The financial help of the National Nature Science Foundation of China (Grant No. 51178104), Ph.D. Program’s Foundation of Ministry of Education of China (Grant No. 20110092110033) and 333 Project of Jiangsu Province is gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Sep 29, 2015
Accepted: Apr 19, 2016
Published online: Jul 7, 2016
Published in print: Dec 1, 2016
Discussion open until: Dec 7, 2016
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