Morphological, microstructural, and mechanical properties of highly-ordered C–S–H regulated by cellulose nanocrystals (CNCs)
Morphological, microstructural, and mechanical properties of highly-ordered C–S–H regulated by cellulose nanocrystals (CNCs)
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DOI：
10.1016/j.cemconcomp.2023.105276
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发表时间：
2023-10
影响因子：
10.5
通讯作者：
Yuhuan Wang;Sarah Goodman;Yi Bao;Weina Meng
中科院分区：
文献类型：
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作者：
Yuhuan Wang;Sarah Goodman;Yi Bao;Weina Meng
水化硅酸钙的微观结构与水泥基材料的力学性能和耐久性密切相关。C-S-H微结构的随机生长在很大程度上损害了力学性能和耐久性。本文提出了利用纤维素纳米晶（CNCs）对C-S-H的微观结构进行改性。本研究通过动态光散射（DLS）、透射电子显微镜（TEM）、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、热重分析（TGA）、原子力显微镜（AFM）和三点弯曲试验研究了CNCs对C-S-H形态、微观结构和力学性能的影响。结果表明，CNC能有效抑制C-S-H的团聚，制备出高度有序、层状、致密的C-S-H/CNC纳米复合材料。C-S-H/CNC纳米复合材料中的C-S-H和CNC通过氢键和钙离子配位键相互作用。C-S-H/CNCs纳米复合材料的强相互作用和有序的微观结构使其具有高的强度和柔韧性。
Microstructures of calcium silicate hydrates (C–S–H) are relevant to the mechanical properties and durability of cement-based materials. Random growth of the microstructures of C–S–H largely compromises the mechanical properties and durability. This paper proposes to utilize cellulose nanocrystals (CNCs) to modify the microstructures of C–S–H. This research investigates the effect of CNCs on the morphological, microstructural, and mechanical properties of C–S–H through dynamic light scattering (DLS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetry analysis (TGA), atomic force microscopy (AFM), and three-point bending tests. The results showed that CNCs effectively mitigated the agglomeration of C–S–H and generated C–S–H/CNC nanocomposites with highly ordered, layered, and dense microstructures. The C–S–H and CNCs in the C–S–H/CNC nanocomposites had strong interactions through hydrogen bonds and calcium ion coordination bonds. The strong interactions and ordered microstructures enable C–S–H/CNCs nanocomposites to achieve high strength and flexibility.