Snoeck D, Wang J, Bentz D P, De Belie N
Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering and Architecture, Ghent University, Tech Lane Ghent Science Park, Campus A, Technologiepark Zwijnaarde 904, B-9052 Gent, Belgium.
Center for Microbial Ecology and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
Cem Concr Compos. 2018 Feb;86:30-39. doi: 10.1016/j.cemconcomp.2017.11.001. Epub 2017 Nov 4.
One of the major concerns in infrastructure repair is a sufficient bond between the substrate and the repair material, especially for the long-term performance and durability of the repaired structure. In this study, the bond of the repair material on the mortar substrate is promoted via the biodeposition of a calcium carbonate layer by a ureolytic bacterium. X-ray diffraction and scanning electron microscopy were used to examine the interfaces between the repair material and the substrate, as well as the polymorph of the deposited calcium carbonate. The approximately 50 μm thick biodeposition film on the mortar surface mostly consisted of calcite and vaterite. Both the repair material and the substrate tended to show a good adherence to that layer. The bond, as assessed by slant shear specimen testing, was improved by the presence of the biodeposition layer. A further increase was found when engineering the substrate surface using a structured pattern layer of biodeposition.
基础设施修复中的一个主要问题是基材与修复材料之间要有足够的粘结力，特别是对于修复结构的长期性能和耐久性而言。在本研究中，通过尿素分解细菌生物沉积碳酸钙层来促进修复材料与砂浆基材之间的粘结。利用X射线衍射和扫描电子显微镜来检查修复材料与基材之间的界面以及沉积碳酸钙的多晶型物。砂浆表面上约50μm厚的生物沉积膜主要由方解石和球霰石组成。修复材料和基材都倾向于与该层表现出良好的附着力。通过倾斜剪切试样测试评估，生物沉积层的存在改善了粘结力。当使用生物沉积的结构化图案层对基材表面进行处理时，粘结力进一步提高。
