Interlayer bonding improvement of 3D printed concrete with polymer modified mortar: Experiments and molecular dynamics studies
Interlayer bonding improvement of 3D printed concrete with polymer modified mortar: Experiments and molecular dynamics studies
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聚合物改性砂浆改善 3D 打印混凝土的层间粘结：实验和分子动力学研究
DOI：
10.1016/j.cemconcomp.2020.103571
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发表时间：
2020-07
影响因子：
10.5
通讯作者：
Mo Zhang
中科院分区：
文献类型：
--
作者：
Li Wang;Zehao Tian;Guowei Ma;Mo Zhang
3D混凝土打印的层压堆叠过程中相邻层之间固有的弱界面阻碍了这种先进技术在一般工程应用中的应用。本研究利用聚合物改性砂浆改善水泥砂浆层间粘结性能。测试了印刷混凝土的凝结时间和层间水分变化对印刷效果的影响。根据层间距的不同，分别制备了环氧树脂和氯丁胶乳改性砂浆作为层间界面增强材料。通过正交试验对聚合物砂浆加固界面的抗拉强度和抗剪强度进行了测试和评价。此外，采用分子动力学和密度泛函理论模拟了水泥基复合材料表面释放的水分对环氧树脂和氯丁胶乳改性砂浆层间粘结性能的影响，并探讨了其增强机理。结果表明，环氧树脂与水化硅酸钙中钙离子之间的静电相互作用（库仑力）抵消了水分子（表面水分）对层间粘结的削弱作用，从而改善了印刷混凝土的界面粘结。最佳的聚合物砂浆，最有效地加强接口被确定。
The inherent weak interfaces between adjacent layers by the laminate stacking process of 3D concrete printing hinder this advanced technique for general engineering applications. In this study, polymer-modified mortars were fabricated to improve the weak interlayer bonding performances. The effects of the setting time of the printed concrete and changes of the interlayer moisture were tested. Both epoxy resin- and chloroprene latex-modified mortars were prepared and used as interlayer interface enhancement materials according to different interlayer intervals. The direct tensile and shear strengths of the polymer mortar-strengthened interfaces were tested and evaluated by the crossover test. Moreover, the effects of the moisture released from the surface of the cement-based composite materials on the interlaminar bonding properties and the enhancing mechanism of the epoxy resin- and chloroprene latex-modified mortars were simulated through molecular dynamics and density functional theory. The results demonstrate that the electrostatic interaction (Coulomb force) between the epoxy resin and calcium ions from hydrated calcium silicate counteracts the weakening effect of water molecules (surface moisture) on the interlaminar bonding, thus improving the interface bonding of printed concrete. The optimal polymer mortar that strengthens the interfaces most effectively was identified.
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