On the interaction between proteins and cracked cementitious surface
On the interaction between proteins and cracked cementitious surface
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DOI：
10.1016/j.conbuildmat.2022.128982
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发表时间：
2022-10-17
影响因子：
7.4
通讯作者：
Ghahremaninezhad，Ali
中科院分区：
文献类型：
--
作者：
Baffoe，Elvis;Ghahremaninezhad，Ali
尽管在胶凝材料中促进裂纹愈合的生物粘结越来越受到人们的关注，但生物分子作为生物粘结的重要组成部分的作用还没有引起人们的重视。这篇论文考察了具有不同分子结构的蛋白质与可以代表裂纹表面的胶凝表面之间的相互作用。采用傅立叶变换红外光谱(FTIR)、热重分析(TGA)、X射线衍射仪(X射线衍射仪)、扫描电子显微镜(SEM)等手段对胶凝材料表面产物的化学特性和微观结构进行了研究。用光学和X射线显微计算机断层扫描(Micro-CT)成像来评价蛋白质的缝隙填充能力。用三点弯曲试验研究了蛋白质的裂纹愈合性能。与对照样品相比，经蛋白质处理的样品在强度恢复和裂缝填充方面有显著的提高。结果表明，在水泥化学作用下，蛋白质发生了分子变化，从而提高了蛋白质与胶凝表面的界面强度。研究还发现，这些蛋白质能有效地诱导胶凝材料表面的疏水。结果表明，表面产物主要由碳酸钙(CaCO3)、钙矾石和水化硅酸钙(C单键S单键H)组成。经蛋白质处理的样品中钙矾石的形态与对照样品有明显的差异。
While there has been an increasing interest in the area of biocementation for crack healing in cementitious materials, the role of biomolecules as an important constituent in biocementation has not received attention. This paper examines the interaction between proteins, with different molecular structures, and a cementitious surface that can represent a crack surface. The chemical characteristics and microstructure of the product formed on the cementitious surface were studied using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The optical and X-ray micro-computed tomography (micro-CT) imaging were employed to evaluate the crack filling ability of the proteins. The crack healing property of the proteins was investigated using the three-point bend test. The samples treated with proteins demonstrated marked increase in strength recovery as well as crack filling, compared to the control sample. The molecular changes occurring in proteins when exposed to cement chemistry were shown to improve the interfacial strength between the proteins and cementitious surface. It was also found that the proteins can effectively induce hydrophobization on cementitious surface. It was shown that the surface product consisted mainly of calcium carbonate (CaCO3), ettringite, and calcium-silicate-hydrate (Csingle bondSsingle bondH). The morphology of ettringite in the samples treated with proteins showed distinct differences compared to that in the control samples.