碱激发偏高岭土基地聚物改性黏土的表面结构与力学性能研究

现代矿业 ›› 2022, Vol. 38 ›› Issue (12): 239-.

碱激发偏高岭土基地聚物改性黏土的表面结构与力学性能研究

杨鸿举^1，2 姜琴^1，2 吴旭^1，2

1. 中钢集团马鞍山矿山研究总院股份有限公司； 2. 国家金属矿山固体废物处理与处置工程技术研究中心

出版日期:2022-12-25 发布日期:2023-05-16
基金资助:
安徽省科技重大专项（编号：201903A07020010）。

Study on Surface Structure and Mechanical Properties of Alkali Activated Metakaolin-based Polymer Modified Clay

YANG Hongju^1，2 JIANG Qin^1，2 WU Xu^1，2

1. Sinosteel Maanshan General Institute of Mining Research Co.，Ltd.;2. National Research Center for Solid Waste Treatment and Disposal Engineering of Metal Mines

Online:2022-12-25 Published:2023-05-16

摘要/Abstract

摘要： 为了了解偏高岭土基地聚物黏结剂碱度对改良黏土的效果，研究了碱激发剂的物质的量浓度、偏高岭土基聚合物的不同浓度和固化时间对样品无侧限抗压强度的影响，以及地聚合物是否与黏土中的物质发生反应。结果表明，与原黏土相比，无侧限抗压强度随偏高岭土含量和 NaOH 物质的量浓度的增加而增加；NaOH 浓度为8 mol/L，NaOH 用量为12%的样品养护28 d 的抗压强度为4109 N，比原黏土提高112%。扫描电子显微镜（SEM）和X射线衍射（XRD）分析表明，地聚物与黏土发生反应形成胶结颗粒，胶结化合物覆盖了黏土颗粒。研究验证了偏高岭土基地聚合物黏结剂在常温强碱环境下聚合的有效性和稳定性。研究结果可为偏高岭土基地聚物在土壤改良工程中的应用和推广提供依据。

关键词: 偏高岭土, 地聚物, 碱激发, 表面结构, 力学性质

Abstract: In order to understand the effect of the alkalinity of metakaolin base polymer binder on the improvement of clay，the effects of the concentration of alkali activator substance，the different concentra⁃ tion of metakaolin based polymer and curing time on the unconfined compressive strength of the sample， and whether the geopolymers react with substances in the clay were studied. The results show that，com⁃ pared with the original clay，the unconfined compressive strength increases with the increase of metakaolin content and the molarity of NaOH. The compressive strength of the sample with 8 mol/L NaOH concentra⁃ tion and 12% NaOH dosage was 4109 N after curing for 28 days，which was 112% higher than that of the original clay. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis showed that the geopolymer reacted with the clay to form cementing particles，which were covered by cementing com⁃ pounds. The effectiveness and stability of polymeric binder based on metakaolin were verified under normal temperature and strong alkali environment. The results can provide a basis for the application and popular⁃ ization of metakaolin base polymer in soil improvement engineering.

Key words: metakaolin, geopolymer, alkali excitation, surface structure, mechanical property

杨鸿举, 姜琴, 吴旭. 碱激发偏高岭土基地聚物改性黏土的表面结构与力学性能研究[J]. 现代矿业, 2022, 38(12): 239-.

YANG Hongju, JIANG Qin, WU Xu. Study on Surface Structure and Mechanical Properties of Alkali Activated Metakaolin-based Polymer Modified Clay[J]. Modern Mining, 2022, 38(12): 239-.

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