摘要
地质聚合物作为新兴绿色无机胶凝材料,因独特的三维网络骨架结构而兼具矿物和高分子材料的特性。分别以固体废弃物粉煤灰和偏高岭土为原料,采用碱激发方式制备地质聚合物试块,考察养护28 d后试块在5%HCl、10%NaOH、5%MgCl 2+5%NaCl和5%H 2SO 4(均为质量分数)溶液中浸泡1~84 d的耐化学侵蚀能力。X射线衍射仪(XRD)、扫描电子显微镜(SEM)及试块质量、抗压强度测试表明,不同浸泡环境所引起地质聚合物胶凝材料的响应差异较大,粉煤灰基地质聚合物表现出较优异的耐低浓度硫酸、氢氧化钠、盐溶液侵蚀性能,微观结构及外观形貌稳定,试块质量和抗压强度稳定。偏高岭土基地质聚合物在盐溶液中性条件下结构和性能较稳定。在盐酸环境下两种地质聚合物被腐蚀明显,质量损失率大,抗压强度降低显著。对比研究表明,粉煤灰基地质聚合物的耐低浓度酸、碱溶液腐蚀性明显优于偏高岭土基地质聚合物。上述两类地质聚合物可潜在应用于海洋建筑领域。
Geopolymer is a kind of new green cementitious material with network structures and amorphous phase,which has the characteristics of mineral and polymer materials.Fly ash and metakaolin were respectively used as raw materials to prepare geopolymer through alkali excitation.The durability of geopolymers(curing 28 d)under 5%HCl,10%NaOH,5%MgCl 2+5%NaCl,and 5%H 2SO 4(all were mass fraction)erosion environment for 1 d to 84 d were researched.The results of X-ray diffraction(XRD),scanning electron microscopy(SEM),mass change and compressive strength reveal that geopolymers show different responses under different erosion environments.Fly ash based geopolymer exhibits excellent durability in low concentration of H 2SO 4,NaOH and salt solution,shows stability in microstructure,appearance,mass and compressive strength.Metakaolin based geopolymer has stable structure and property in salt solution.But under HCl erosion environment,the loss of mass and compressive strength for two geopolymers are significant,indicating obvious corrosion.The durability of fly ash based geopolymer in low concentration acid and base solution is more excellent than that of metakaolin based geopolymer.The potential application of these geopolymers is marine construction.
作者
仇秀梅
刘亚东
严春杰
QIU Xiumei;LIU Yadong;YAN Chunjie(Hubei Geological Research Laboratory,Wuhan 430034,China;Hubei Urban Construction Vocational and Technological College,Wuhan 430205,China;Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan 430074,China)
出处
《硅酸盐通报》
CAS
北大核心
2021年第2期548-556,共9页
Bulletin of the Chinese Ceramic Society
基金
湖北省地质实验测试中心科技项目(CSZXKJ-202111)
湖北省地质局2019年科技项目(KJ2019-28)
湖北省地质局2020年科技项目(KJ2020-31)。
