纳米二氧化硅对水硬性石灰胶凝性能的影响
收稿日期: 2022-09-13
网络出版日期: 2023-07-13
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
Received date: 2022-09-13
Online published: 2023-07-13
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。
王悦 , 方国祥 , 张道明 , 王维成 . 纳米二氧化硅对水硬性石灰胶凝性能的影响[J]. 无机盐工业, 2023 , 55(7) : 75 -80 . DOI: 10.19964/j.issn.1006-4990.2022-0552
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.
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