材料科学
韧性
水合硅酸钙
胶凝的
复合材料
硅酸盐水泥
复合数
微观结构
灰浆
硅酸钙
吸水率
成核
水泥
有机化学
化学
作者
Xin Liu,Feng Pan,Cristina Ruiz Agudo,Hao Sun,Xiaobin Yu,Jonathan Avaro,Jiale Huang,Dongshuai Hou,Qianping Ran,Jinxiang Hong,Jiaping Liu,Changwen Miao,Helmut Cölfen
标识
DOI:10.1002/adfm.202307437
摘要
Abstract The low toughness under the tension of cement and concrete materials has been a long‐standing issue for decades and it has become increasingly urgent to address in modern society due to the growing demand for the development of high‐performance and sustainable constructions. Manipulating calcium silicate hydrate (C‐S‐H), the main hydration product of Portland cement, which determines the mechanical properties of cementitious materials, is an attractive method for improving their toughness following a bottom‐up approach. Inspired by the microstructure of nacre, a high energy absorption C‐S‐H‐based composite with a highly ordered structure is fabricated by a designed ternary building block, in which exfoliated montmorillonite provides a template for the nucleation and growth of C‐S‐H generating the “brick”, and polyvinyl alcohol acts as a “mortar” binding all the building blocks together. With the hierarchical toughening strategy explored here, the obtained C‐S‐H composite achieves a remarkable energy absorption of 16.2 ± 2.6 MJ m −3 , which surprisingly outperforms the ultra‐high toughness cementitious materials by a factor of 20–60 and is even higher than that of natural nacre and other nacre‐like composites. These findings not only provide valuable insights into enhancing the toughness of cementitious materials but also open possibilities for broadening potential applications of C‐S‐H.
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