喷射打印超速凝磷酸镁水泥涂层的粘结强度与耐久性

doi:10.16552/j.cnki.issn1001-1625.2024.1356

摘要/Abstract

摘要： 为保证工作时间,磷酸镁水泥涂层在常规喷涂工艺下需要掺入大量缓凝剂,这不仅会削弱涂层早期小时强度,也会提高原材料成本。基于此,本文采用混搅喷功能一体化喷射打印设备,以干粉进、湿料出的喷射模式实现无缓凝剂超速凝磷酸镁水泥涂层的制备与喷射施工,进一步研究该涂层在不同养护环境下粘结强度发展规律及冻融循环作用下抗冻性能提升效果。结果表明:镁磷摩尔比(M/P)为6、水胶比(W/B)为0.18时超速凝磷酸镁水泥涂层的粘结强度最优,60 d粘结强度可达2.46 MPa;与同龄期空气养护相比,海水、盐湖卤水养护前期超速凝磷酸镁水泥涂层粘结强度提升率显著,分别为43.2%、22.5%;养护前期,海水、盐湖卤水能促进涂层中未反应的氧化镁与磷酸二氢钾继续发生水化反应生成更多的鸟粪石,从而增强涂层的粘结强度;养护后期涂层粘结强度略有下降,但仍能保持在0.84 MPa。与无涂层混凝土相比,冻融循环150次时超速凝磷酸镁水泥涂层混凝土抗压强度保留率、相对动弹模量分别提高了111.5%、33.1%,质量损失率降低了76.3%。研究结果为喷射打印超速凝磷酸镁水泥涂层应用在恶劣环境下混凝土结构防护工程提供了理论基础。

关键词: 磷酸镁水泥涂层, 喷射打印, 超速凝, 海水, 盐湖卤水, 粘结强度, 抗冻性能

Abstract: In order to ensure the working time, the magnesium phosphate cement coating needs to be mixed with a large amount of retarder under the conventional spraying process, which not only weakens the early hour strength of the coating, but also increases the cost of raw materials. Based on this, this paper adopted the integrated spray printing equipment with mixing and spraying function, and realized the preparation and spraying construction of the ultra-rapid setting magnesium phosphate cement coating without retarder by the spray mode of dry powder inlet and wet material outlet. The development law of bonding strength of the coating under different curing environments and the improvement effect of frost resistance under freeze-thaw cycle were further studied. The results show that when the magnesium-phosphorus molar ratio (M/P) is 6 and the water-binder ratio (W/B) is 0.18, the bonding strength of the ultra-rapid setting magnesium phosphate cement coating is the best, and the bonding strength can reach 2.46 MPa after 60 d. Compared with the air curing at the same age, the bonding strength of the ultra-rapid setting magnesium phosphate cement coating in the early stage of seawater and salt lake brine curing is significantly increased by 43.2% and 22.5%, respectively. In the early stage of curing, seawater and salt lake brine can promote the hydration reaction of unreacted magnesium oxide and potassium dihydrogen phosphate in the coating to generate more struvite, thereby enhancing the bonding strength of the coating. The bonding strength of the coating decreases slightly at the later stage of curing, but it can still be maintained 0.84 MPa.Compared with uncoated concrete, the compressive strength retention rate and relative dynamic elastic modulus of ultra-rapid setting magnesium phosphate cement coated concrete increase by 111.5% and 33.1%, respectively, and the mass loss rate decreases by 76.3% after 150 times freeze-thaw cycles. The research results provide a theoretical basis for the application of spray printing ultra-rapid setting magnesium phosphate cement coating in concrete structure protection engineering under harsh environment.

Key words: magnesium phosphate cement coating, spray printing, ultra-rapid setting, seawater, salt lake brine, bonding strength, frost resistance

中图分类号:

TU525.9

梁云, 喻秋淳, 邓永杰, 董思伽, 李维红, 李栋伟. 喷射打印超速凝磷酸镁水泥涂层的粘结强度与耐久性[J]. 硅酸盐通报, 2025, 44(6): 1967-1978.

LIANG Yun, YU Qiuchun, DENG Yongjie, DONG Sijia, LI Weihong, LI Dongwei. Bonding Strength and Durability of Spray Printing Ultra-Rapid Setting Magnesium Phosphate Cement Coating[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(6): 1967-1978.

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