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建筑石膏与胶凝材料
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改性碳酸钙晶须对工程水泥基材料力学性能的影响研究

作者：宋梦凡1，高新刚2，周宗辉3

关键字：改性,碳酸钙,晶须,对,工程,水泥,基,材料,山,

　
（1.山东建研检测检验科技有限公司，山东 济南  250101；2.济南市历城区城乡建设综合服务中心，山东 济南  250100；3.济南大学，山东 济南  250022）
    摘要：采用正硅酸乙酯（TEOS）对CaCO3晶须进行表面改性，通过X射线光电子能谱仪、红外光谱仪、扫描电子显微镜及X射线衍射仪等测试改性CaCO3晶须（MCW）表面的组成与特性。结果表明，正硅酸乙酯的水解产物与CaCO3晶须表面的羟基发生反应，在CaCO3晶须表面形成了稳定的、无定形态的SiO2。改性CaCO3晶须能进一步提高工程水泥基材料（ECC）的力学性能。改性CaCO3晶须增强ECC的作用机理为：改性CaCO3晶须表面的SiO2与Ca（OH）2发生水化反应，在MCW周围生成更多C-S-H凝胶，CaCO3晶须被周围水化产物紧密包裹，增强了晶须与水泥基材料之间的界面粘结作用，裂缝在扩展过程中消耗更多的能量；水化反应的进行提高了水泥石结构的致密性，从而进一步提高ECC的力学性能。
    关键词：碳酸钙晶须；改性晶须；工程水泥基复合材料；力学性能
    中图分类号：TU528.043        文献标识码：A        文章编号：1001-702X（2023）04-0145-06
 
Study on influence of modified calcium carbonate whisker on mechanical properties of engineered cementitious composites
SONG Mengfan1，GAO Xin'gang2，ZHOU Zonghui3
（1.Shandong Jianyan Testing and Inspection Technology Co. Ltd.，Jinan 250101，China；2.Jinan Licheng District Urban and Rural Construction Comprehensive Service Center，Jinan 250100，China；3.University of Jinan，Jinan 250022，China）
    Abstract：The surface of CaCO3 whisker was treated by ethyl orthosilicate（TEOS）. The surface composition and properties of modified CaCO3 whisker were measured by X-ray photoelectron spectroscopy，infrared spectrometer，scanning electron microscope and X-ray diffractometer. The results show that the hydrolysate of TEOS reacts with the hydroxyl group on the surface of CaCO3 whisker，and forms stable and amorphous SiO2 on the whisker surface of CaCO3 whisker. The modified CaCO3 whisker further improve the mechanical properties of ECC. The mechanism of modified CaCO3 whisker reinforced ECC was revealed，SiO2 coated on the surface of the modified CaCO3 whisker reacts with Ca（OH）2 in cement-based material，and more C-S-H gel is generated around MCW. Therefore，CaCO3 whiskers are tightly wrapped by hydration products，thus enhancing the bonding effect between the whiskers and cement-based materials. And causing more energy consumed during the development of fracture propagation. One the other hand，the hydration reaction improves the compactness of the cement structure，further enhancing the mechanical properties of ECC.
    Key words：calcium carbonate whisker，modified whisker，engineered cementitious composites（ECC），mechanical properties