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 ›› 2023, Vol. 55 ›› Issue (7): 75-80.doi: 10.19964/j.issn.1006-4990.2022-0552

• 研究与开发 • 上一篇    下一篇

纳米二氧化硅对水硬性石灰胶凝性能的影响

王悦1(), 方国祥2, 张道明3, 王维成1   

  1. 1.齐齐哈尔大学材料科学与工程学院,黑龙江 齐齐哈尔 161006
    2.诚邦生态环境股份有限公司,浙江 杭州 310008
    3.齐齐哈尔大学建筑与土木工程学院,黑龙江 齐齐哈尔 161006
  • 收稿日期:2022-09-13 出版日期:2023-07-10 发布日期:2023-07-13
  • 通讯作者: 张道明(1965— ),男,博士,教授,研究方向为古建筑保护。
  • 作者简介:王悦(1995— ),女,硕士研究生,助理工程师,研究方向为古建筑保护;E-mail:503718142@qq.com
  • 基金资助:
    黑龙江省省属高等学校基本科研业务费科研项目(135409436)

Effect of nanosilica on gelling properties of hydraulic lime

WANG Yue1(), FANG Guoxiang2, ZHANG Daoming3, WANG Weicheng1   

  1. 1. School of Materials Science and Engineering,Qiqihar University,Qiqihar 161006,China
    2. Chengbang Ecological Environment Co. ,Ltd. ,Hangzhou 310008,China
    3. School of Architecture and;Civil Engineering,Qiqihar University,Qiqihar 161006,China
  • Received:2022-09-13 Published:2023-07-10 Online:2023-07-13

摘要:

天然水硬性石灰(NHL)是同时具有水硬性及气硬性的无机胶凝材料,主要用作古建筑加固及壁画修复的粘结剂。低等级NHL因其相对较慢的水化或反应速率,存在开裂、耐水性差、Ca(OH)2浸出等问题。系统地研究了气相纳米SiO2(粉末状)对水硬性石灰物理性能及微观内部结构的影响。基于天然水硬性石灰和纳米SiO2的特性,在天然水硬性石灰中加入纳米SiO2,既可改善NHL的活性,增加胶凝材料的水化硅酸钙含量,又不改变石灰原有颜色。实验研究表明,纳米SiO2的添入可以使NHL2的等级提升至NHL3.5甚至NHL5。利用XRD、XRF、FT-IR及SEM等表征方法对样品进行微观分析,发现在天然水硬性石灰胶凝材料中生成大量的硅酸钙胶凝材料,使试件结构致密,揭示了天然水硬性石灰材料力学性能提升的原因。

关键词: 纳米SiO2, 水硬性石灰, 微观表征, 力学性能

Abstract:

Natural hydraulic lime(NHL) is an inorganic adhesive material with both hydraulic and pneumatic,which is mainly used as binder for ancient building reinforcement and mural restoration.Low-grade NHL has problems such as cracking,poor water resistance,and Ca(OH)2 leaching because of its relatively slow hydration or reaction rate.The effect of the gas phase nano SiO2(powder) on the physical properties and microscopic internal structure of the hydraulic lime was studied.Based on the characteristics of natural hydrated lime and nano SiO2,adding nano SiO2 to natural hydrated lime could improve the activity of NHL to increase the content of hydrated calcium silicate in gel materials without changing the original color of lime.The experimental studies showed that the addition of nano SiO2 could increase the grade of NHL2 to NHL3.5 or even NHL5.Microanalysis of samples was conducted by using XRD,XRF,FT-IR,and SEM in the overall reaction.It was found that a large amount of calcium silicate gel material was generated in the natural hydraulic lime gel materials,which made the specimen structure compact,revealing the reason for the improvement of mechanical properties of natural hydraulic lime materials.

Key words: nano SiO2, hydraulic lime, microscopic characterization, mechanical properties

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