不同侵蚀环境下地质聚合物耐久性研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (2): 548-556.

所属专题：资源综合利用

不同侵蚀环境下地质聚合物耐久性研究

仇秀梅¹, 刘亚东², 严春杰³

1.湖北省地质实验测试中心,武汉 430034;
2.湖北城市建设职业技术学院,武汉 430205;
3.中国地质大学材料与化学学院,武汉 430074

收稿日期:2020-10-15 修回日期:2020-11-13 出版日期:2021-02-15 发布日期:2021-03-10
作者简介:仇秀梅(1987—),女,博士,高工。主要从事固废综合利用及环境污染物检测工作。E-mail:303984566@qq.com
基金资助:
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)

Durability of Geopolymers under Different Erosion Environments

QIU Xiumei¹, LIU Yadong², YAN Chunjie³

1. Hubei Geological Research Laboratory, Wuhan 430034, China;
2. Hubei Urban Construction Vocational and Technological College, Wuhan 430205, China;
3. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China

Received:2020-10-15 Revised:2020-11-13 Online:2021-02-15 Published:2021-03-10

摘要/Abstract

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%MgCl₂+5%NaCl和5%H₂SO₄(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。

关键词: 粉煤灰基地质聚合物, 偏高岭土基地质聚合物, 侵蚀环境, 浸泡, 耐久性

Abstract: 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%MgCl₂+5%NaCl, and 5%H₂SO₄ (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 H₂SO₄, 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.

Key words: fly ash based geopolymer, metakaolin based geopolymer, erosion environment, immersion, durability

中图分类号:

TU52

仇秀梅, 刘亚东, 严春杰. 不同侵蚀环境下地质聚合物耐久性研究[J]. 硅酸盐通报, 2021, 40(2): 548-556.

QIU Xiumei, LIU Yadong, YAN Chunjie. Durability of Geopolymers under Different Erosion Environments[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 548-556.

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不同侵蚀环境下地质聚合物耐久性研究

Durability of Geopolymers under Different Erosion Environments

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