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工程水泥基复合材料(ECC)可以有效缓解水泥基体的开裂，但高的水泥用量使其具有明显的自收缩，这损坏了ECC的力学性能和耐久性能。使用纤维素纳米晶须(CNC)来增强ECC力学性能和抗硫酸盐腐蚀性能。结果表明：CNC会提升ECC的应变率和抗压强度，并增加其抗硫酸盐腐蚀性能。CNC促进了水泥水化，它的掺入还会强化聚乙烯(PE)纤维和水泥基体的界面黏结，增强PE纤维的桥联效果，促进ECC的多点开裂。分子动力学模拟分析了CNC对ECC抗硫酸盐腐蚀性能的增强机制。结果表明：CNC主要通过Ca—O配位与氢键和C-S-H发生吸附，覆盖到C-S-H表面，形成保护层，限制SO42-侵入到C-S-H内部并减少SO42-和C-S-H的配位数量。
Abstract：Engineered cementitious composites(ECC)can effectively alleviate the cracking of cement matrix, but the high amount of cement makes it have obvious self-shrinkage, which damages the mechanics and durability of ECC. In ths study, cellulose nanocrystal(CNC)is used to enhance the mechanical performance and sulfate corrosion resistance of ECC. The results show that CNC improves the strain rate and compressive strength of ECC and increases its sulfate corrosion resistance. CNC promotes cement hydration, and its incorporation also strengthens the interfacial bonding between polyethylene(PE) fiber and cement matrix, enhances the “bridging” effect of PE fiber, and promotes multi-point cracking of ECC. Molecular dynamics simulation analyzes the strengthening mechanism of CNC on the sulfate corrosion resistance of ECC. The results show that CNC absorbs C-S-H mainly through Ca—O coordination and hydrogen bonding, covers the surface of C-S-H and forms a protective layer, which not only limits the invasion of SO42- into the interior of C-S-H, but also reduces the coordination number between SO42- and C-S-H.
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基本信息:
中图分类号:TU528.572
引用信息:
[1]吴涛,孟丹,樊其昌.纤维素纳米晶须增强ECC的抗硫酸盐腐蚀性能及机理分析[J].青岛理工大学学报,2025,46(02):9-17.
基金信息:
山东省自然科学基金(ZR2021ME110)
2025-04-30
2025-04-30