期刊
CEMENT & CONCRETE COMPOSITES
卷 126, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2021.104366
关键词
Cement hydration; Unzipped carbon nanotubes; Surface chemistry; Nanotechnology; Mechanical properties
资金
- National Natural Science Foundation of China [52073073]
Carbon nanotubes (CNTs) and graphene oxide (GO) are commonly used carbon-based materials for modifying cementitious materials. This study discovered that unzipped carbon nanotubes (UCNTs) can significantly enhance the compressive and flexural strengths of cement paste, outperforming CNTs and GO. The outstanding reinforcement efficiency of UCNTs is attributed to their abundant surface chemistry similar to GO, as well as their one-dimensionality and bending stiffness similar to pristine CNTs.
Carbon nanotubes (CNTs) and graphene oxide (GO) are the most studied carbon-based materials for the modification of cementitious materials. Prior studies have shown that CNTs (due to high bending stiffness) can improve flexural strength more efficiently than GO, whereas GO (due to active surface groups) performs better in improving the compressive strength of cementitious composites. This laboratory study investigates the role of unzipped CNTs (UCNTs) in cement pates. All three types of UCNTs have a similar C/O atomic ratio as GO, without any wrinkles to be observed under transmission electron microscope. The UNCTs admixed at 0.1% by weight of cement improved the compressive and flexural strengths of a cement paste (w/c of 0.38) by 22% and 51%, respectively, greatly outperforming CNTs and GO, respectively. Such outstanding reinforcement efficiency of UCNTs resulted from their abundant surface chemistry (similar to GO) as well as one-dimensionality and bending stiffness (similar to pristine CNTs).
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