氧化石墨烯对水泥基材料水化性能和微观结构的催化及调控,ACS Sustainable Chemistry & Engineering

当前位置： X-MOL 学术 › ACS Sustain. Chem. Eng. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

氧化石墨烯对水泥基材料水化性能和微观结构的催化及调控
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-03-27 , DOI: 10.1021/acssuschemeng.3c00109
Qiang Fu _{1,

2} , Zhenhua Wang ₁ , Yingkun Xue ₁ , Ditao Niu _{1,

2}

Affiliation

氧化石墨烯（GO）是一种通过强酸氧化在石墨烯表面添加官能化含氧基团的二维材料。表面的含氧官能团使GO具有良好的分散性和表面活性。当 GO 掺入水泥基材料中时，在为水泥水化提供成核位点的同时，它还可以与水泥水化释放的离子发生反应。因此，GO对水泥水化过程具有催化作用，起到调节水化产物形貌的作用，进而影响水泥基材料微观结构的形成。在这项研究中，综述了 GO 对水泥基材料的水化特性、孔结构和内部界面的催化和调节作用。^{水泥颗粒释放2+ ，从而降低Ca}²⁺浓度水泥颗粒周围，缩短水泥水化诱导期。此外，GO可以为水泥水化提供更多的成核位点，缩短水化加速期。GO通过成核作用促进水化产物的形成，逐渐将针状、棒状水化产物转变为花状或多面体状晶体。此外，GO通过上述作用影响水泥水化和水化产物形态时，优化了水泥基材料的孔隙结构。此外，它还通过架桥作用使水化产物之间的联系更加紧密，从而使水泥基材料的总孔隙率降低，凝胶孔含量增加，毛细孔含量降低，孔结构得到显着优化。最后，

"点击查看英文标题和摘要"

Catalysis and Regulation of Graphene Oxide on Hydration Properties and Microstructure of Cement-Based Materials

Graphene oxide (GO) is a two-dimensional material that adds functionalized oxygen-containing groups on the surface of graphene through strong acid oxidation. The oxygen-containing functional groups on the surface make GO have good dispersion and surface activity. When GO is incorporated into cement-based materials, while providing nucleation sites for cement hydration, it can also react with ions released by cement hydration. Therefore, GO has a catalytic effect on the hydration process of cement and plays a role in regulating the morphology of the hydration products, which in turn affects the formation of the microstructure of cement-based materials. In this study, the catalytic and regulatory effects of GO on the hydration characteristics, pore structure, and internal interface of cement-based materials are reviewed. The analysis shows that the oxygen-containing functional groups on the surface of GO can absorb a large number of water molecules, promote the dissolution of cement particles in water, and adsorb the Ca²⁺ released by cement particles, thereby reducing the concentration of Ca²⁺ around the cement particles and shortening the induction period of cement hydration. In addition, GO can provide more nucleation sites for cement hydration and shorten the hydration acceleration period. GO promotes the formation of hydration products through the nucleation effect and gradually transforms needle-like and rod-like hydration products into flower-like or polyhedral-like crystals. In addition, GO optimizes the pore structure of cement-based materials when it affects cement hydration and the morphology of hydration products through the above-mentioned effects. In addition, it makes the connection between hydration products closer through the bridging effect, so that the total porosity of cement-based materials decreases, gel-pore content increases, capillary-pore content decreases, and pore structure is significantly optimized. Finally, while optimizing the pore structure of cement-based materials, GO has an obvious optimization effect on the interface transition zone (ITZ) of cement-based materials, which significantly reduces the ITZ width and increases the ITZ density.

更新日期：2023-03-27

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南