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文章编号： 1672-6987（2023）01-0049-06； DOI： 10.16351/j.1672-6987.2023.01.006
袁衍广， 刘桓宇， 聂延鑫， 庞秀江*（青岛科技大学 化学与分子工程学院，山东 青岛 266042）
摘要： 采用聚羧酸醚(PCE)对镁铝层状双金属氢氧化物(MgAl-LDH)进行表面修饰，制备了聚羧酸醚修饰的层状双金属氢氧化物(PCE-LDH)纳米颗粒作为硅酸盐水泥的早强剂。XRD表征表明，PCE修饰在LDH表面，并没有插入到LDH的层间；粒径分析表明，PCE-LDH具有良好的热稳定性；进一步研究了PCE在LDH表面上的吸附量对其提高水泥水化性能的影响，水泥的水化放热曲线表明，当PCE在LDH表面上的吸附量为1%时， PCE-LDH能够明显提前水化时间并提高水泥水化放热峰的强度；PCE-LDH的掺加量为035%即可明显提高水泥砂浆的早期抗压强度；SEM和EDX结果进一步表明，PCE-LDH的掺加能够使水泥在水化早期形成更多的水合硅酸钙(C-S-H)，从而提高其抗压强度。
关键词： 层状双金属氢氧化物； 聚羧酸醚； 普通硅酸盐水泥； 早期强度
中图分类号： TU 525文献标志码： A
引用格式： 袁衍广， 刘桓宇， 聂延鑫， 等. 表面修饰聚羧酸醚的层状双金属氢氧化物的合成、表征以及在普通硅酸盐水泥中的应用［J］. 青岛科技大学学报(自然科学版), 2023, 44(1): 49-54.
YUAN Yanguang, LIU Huanyu, NIE Yanxin, et al. Synthesis, characterization and application in ordinary portland cement of layered bimetal hydroxidex with surface moditied polycarboxylate ethers［J］. Journal of Qingdao University of Science and Technology（Natural Science Edition), 2023， 44（1）： 49-54.
Synthesis, Characterization and Application in Ordinary Portland Cement of
Layered Bimetal Hydroxidex with Surface Moditied Polycarboxylate Ethers
YUAN Yanguang, LIU Huanyu, NIE Yanxin, PANG Xiujiang
(College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)
Abstract: In this work, nanoparticles of PCE-LDH were used as hardening accelerator for Portland cement, which prepared by modifying MgAl-LDH with polycarboxylate ethers (PCE) in aqueous. Characterization of XRD showed PCE absorbed on the surface of LDH instead of intercalating into LDH′s gallery. Particle size distribution analysis showed PCE-LDH possessed better thermal stability. The effect of the adsorption amount of PCE on the surface of LDH on the improvement of cement hydration performance was also studied. Heat evolution curves of the hydrating cement pastes were got by heat calorimeter, PCE-LDH with PCE content of 10% showed obvious effectiveness for increasing heat flow and advancing hydration time. The addition of PCE-LDH with dosage of 035% can enhance the early strength of mortar due to more C-S-H formation at early stage according to results of SEM and EDX.
Key words: layered double hydroxides; polycarboxylic ethers; portland cement; early strength
收稿日期： 2022-01-23
基金项目： 淄博市重点研发计划（市外校城融合）项目（2020XCCG0122）.
作者简介： 袁衍广（1996—），男，硕士研究生.*通信联系人.
