کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7883511 | 1509640 | 2018 | 40 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A chitosan based pH-responsive hydrogel for encapsulation of bacteria for self-sealing concrete
ترجمه فارسی عنوان
یک هیدروژل واکنشگر مبتنی بر کیتوزان برای کپسوله کردن باکتری ها برای بتن خودچسبدار
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی صنعتی و تولید
چکیده انگلیسی
Cracks in concrete remain one of the major issues in constructions. Self-healing concrete by bacteria has already proven to be a promising way to solve this problem. In order to protect bacteria from the harsh condition in concrete, encapsulation of bacteria is preferable. In this study, a pH responsive hydrogel was synthesized to encapsulate bacterial spores for self-sealing concrete cracks. The pH responsiveness and the influence of the hydrogel on the mechanical properties were investigated. The viability of the encapsulated spores and the cell-entrapping capacity of the hydrogel were then examined. The self-sealing efficiency was evaluated by the reduction of water flow and crack sealing ratio. The results indicated that the chitosan based hydrogel had a suitable pH responsiveness. Within the pH range between 7 and 11, the swelling capacity remained stable, with no significant differences as the swelling varied between 38.5â¯Â±â¯0.5 and 42.9â¯Â±â¯1.5â¯g water/g hydrogel. The swelling greatly decreased to around 12.8â¯Â±â¯0.9â¯g water/g hydrogel in cement filtrate. The compressive strength only decreased around 5% with the addition of 1â¯m% of hydrogel. The specimens with hydrogel encapsulated spores showed the highest reduction in water flow (81-90%) and highest crack sealing efficiency. More than 30% of the crack locations was completely bridged. While in other specimens, only 2-12% of the crack locations was completely sealed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Composites - Volume 93, October 2018, Pages 309-322
Journal: Cement and Concrete Composites - Volume 93, October 2018, Pages 309-322
نویسندگان
Jianyun Wang, Arn Mignon, Gilles Trenson, Sandra Van Vlierberghe, Nico Boon, Nele De Belie,