无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2024, Vol. 56 ›› Issue (4): 57-63.doi: 10.19964/j.issn.1006-4990.2023-0339

• 研究与开发 • 上一篇    下一篇

镁铝水滑石对高铁低钙硅酸盐水泥性能的影响

李珂珂(), 薛江伟, 王露威, 管学茂()   

  1. 河南理工大学材料科学与工程学院,河南 焦作 454003
  • 收稿日期:2023-06-25 出版日期:2024-04-10 发布日期:2024-04-18
  • 通讯作者: 管学茂(1965— ),男,博士,教授,研究方向为固体废弃物在建材中的资源化利用、功能建筑材料;E-mail:guanxuemao@ hpu.edu.cn
  • 作者简介:李珂珂(1998— ),男,在读硕士研究生,研究方向为混凝土工程环境服役行为与机理研究; E-mail:kekeha123@foxmail.com
  • 基金资助:
    国家自然科学基金-重点支持项目-促进海峡两岸科技合作联合基金项目(U1905216)

Effect of MgAl-layered double hydroxides on properties of high-iron low-calcium portland cement

LI Keke(), XUE Jiangwei, WANG Luwei, GUAN Xuemao()   

  1. School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China
  • Received:2023-06-25 Published:2024-04-10 Online:2024-04-18

摘要:

采用成核晶化隔离法合成了镁铝水滑石(MgAl-LDH),并利用石灰石、砂岩和铁矿粉制备了高铁低钙硅酸盐水泥熟料(铁相质量分数为19.6%)。通过X射线衍射(XRD)、热重(TG)、扫描电镜(SEM)和化学分析法,研究了MgAl-LDH掺量对高铁低钙水泥氯离子固化能力、力学性能和微观结构的影响规律。结果表明:MgAl-LDH能显著提升高铁低钙水泥化学固化氯离子能力及力学性能;当MgAl-LDH掺量为3%(质量分数)时,与空白组相比,7 d氯离子固化率提升了46.4%,3、7、28 d抗压强度分别提高了27.5%、34.6%和17.1%。微观测试表明MgAl-LDH能促进高铁低钙水泥早期水化生成更多的水化产物,在一定程度上促进了水泥结构的致密化;并且能促进水化产物和氯离子发生反应生成Friedel′s盐,提升了高铁低钙水泥对氯离子的化学固化量。

关键词: 镁铝水滑石, 高铁低钙水泥, 氯离子固化, 力学性能, Friedel′s盐

Abstract:

MgAl-layered double hydroxides(MgAl-LDH) were synthesized using a separate nucleation and aging steps(SNAS) method,and high-iron low-calcium portland cement(iron phase mass fraction of 19.6%) was prepared by limestone,standstone and iron ore powder.The effects of MgAl-LDH content on the chloride curing ability,mechanical properties and microstructure of high-iron low-calcium cement were studied by X-ray diffraction(XRD),thermogravimetric(TG),scanning electron microscopy(SEM),and chemical analysis methods.The results showed that MgAl-LDH could improve the mechanical properties and chemical curing ability of chloride ions.When MgAl-LDH content was 3%(mass fraction),compared with the blank group,the chloride ion curing rate at 7 d was increased by 46.4%,and the compressive strength at 3,7 d and 28 d was increased by 27.5%,34.6% and 17.1%,respectively.The microscopic tests showed that MgAl-LDH could promote the early hydration of high-iron low-calcium cement to generate more hydration products,and promote the densification of cement structure to a certain extent.And it could promote the reaction of hydration products and chloride ions to form Friedel's salt,and improve the chemical curing amount of chloride ions.

Key words: MgAl-LDH, high-iron low-calcium cement, chloride bingding, mechanical properties, Friedel′s salt

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