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EFFECT OF BACTERIA ON MECHANICAL PROPERTIES OF ENGINEERED CEMENTITIOUS COMPOSITES



Author(s): Yuanzhao Ding, Dafang Li, Zhigang Zhang and Shunzhi Qian
Paper category: Proceedings
Book title: Proceedings of the Final Conference of RILEM 253-MCI Microorganisms-Cementitious Materials Interactions Volume II
Editor(s): Alexandra Bertron and Henk Jonkers
ISBN: 978-2-35158-207-7 (Set)
ISBN: 978-2-35158-210-7 (Volume 2)
e-ISBN: 978-2-35158-206-0
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 485-490
Total Pages: 308
Language : English


Abstract: Cementitious materials are commonly used in civil infrastructures. Despite many advantages, cracking related problems persist, such as leakage, loss of stiffness, and even structural failures, which are more severe for underground structures. This kind of problem will be addressed in this paper via bacteria modified Engineered Cementitious Composites (ECC) which has improved mechanical properties, including but not limited to tensile and self-healing performance, etc. When environment exposure is favorable, the embedded bacteria may be activated automatically due to porous structure of the matrix and/or crack, therefore releasing calcium carbonate via metabolic conversion of nutrients to fiber/matrix interface and/or cracks without external intervention. On the other hand, the addition of bacteria may also influence adversely on the compressive strength of cement/concrete material. This may also reduce the fracture toughness of the matrix which is favorable to the enhancement of tensile ductility, assuming compressive strength is still acceptable. In this study, all these effects will be carefully examined via tensile test and flexural test, as well as microscale observation. This will provide another avenue for ECC to achieve better performance whether undamaged or damaged.


Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00


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