- 目录
- 化学建材
- 首页
氟铝络合物制备无碱液体速凝剂及性能研究
作者：古朝建，任豪，任启进，张毕军
（攀枝花市吉源科技有限责任公司，四川 攀枝花 617000）
摘要：采用Al（OH）3、Mg（OH）2与氢氟酸、氟硅酸制备不同的氟铝络合溶液，然后以硫酸铝、氟铝络合溶液、柠檬酸、分散增强剂、稳定剂为原料合成无碱液体速凝剂。主要研究了氟铝络合物种类和用量对速凝剂pH值、稳定性及其对水泥凝结时间、胶砂强度的影响和与水泥的适应性。结果表明，Al-Mg-Si-F络合物中Al、Mg、Si、F离子浓度分别为0.07、0.015、0.04、0.24 mol/kg时，无碱液体速凝剂的性能最佳；该无碱液体速凝剂掺量为4%~5%时，与5种不同水泥具有良好的适应性，净浆和砂浆性能符合JC 477—2005《喷射混凝土用速凝剂》要求，稳定期大于3个月。同时也符合GB/T 35159—2017《喷射混凝土用速凝剂》的要求。
关键词：氟铝络合物；速凝剂；pH值；稳定性；强度
中图分类号：TU528.042 文献标识码：A 文章编号：1001-702X（2019）06-0123-04
Preparation and performance of alkali-free liquid accelerator with different Al-F complexes
GU Chaojian，REN Hao，REN Qijin，ZHANG Bijun
（Panzhihua Jiyuan Technology Co. Ltd.，Panzhihua 617000，China）
Abstract：Aluminum fluoride complex solution was prepared by industrial Al（OH）3 and/or Mg（OH）2 with HF and/or fluorosil-icic acid，and then alkali-free liquid accelerator was synthesized with aluminum sulfate，aluminum fluoride complex solution，citric acid，disperse reinforcer and stabilizer as main raw materials. The effects of different dosage of fluorine-aluminum complex and different kinds of fluorine-aluminum complex solution on pH value and stability of accelerator，setting time of cement，strength of mortar and adaptability of different cement were studied. The results show that the properties of Al-Mg-Si-F complex accelerator with various ion concentrations of 0.07，0.015，0.04 and 0.24 mol/kg are the best. The 4%~5% dosage range of the alkali-free liquid accelerator can satisfy the requirements of JC 477—2005 standard，and has good adaptability to five cement from different areas. The stable period is longer than 3 months. At the same time，it also meets the requirements of the new standard GB/T 35159—2017 "Accelerator for Shotcrete" about alkali-free accelerator.
Key words：fluoro aluminum complex，accelerator，pH value，stability，strength