贝壳微粉基耐火水泥的制备及性能研究  

Preparation and performance study of shell micropowder based refractory cement

作　　者：苏建斌 王甲春[2] SU Jianbin;WANG Jiachun(Xiamen Technical College,Xiamen 361102,China;Xiamen University of Technology,Xiamen 361024,China)

机构地区：[1]厦门技师学院,福建厦门361102 [2]厦门理工学院,福建厦门361024

出　　处：《混凝土》2025年第2期101-104,114,共5页Concrete

基　　金：福建省科技厅重点项目“自密实混凝土抗开裂能力研究”(2019J01864)。

摘　　要：以废弃贝壳粉替换传统水泥基材料,在实现废物利用的同时可显著降低建材成本。采用反应釜水热法制备了贝壳微粉基耐火水泥,通过扫描电镜、X衍射、红外光谱、水泥稠度仪及万能材料试验机等多种手段研究了贝壳微粉加入量对贝壳微粉基水泥形貌、物相组成、可注射性及凝固性、溶胀性能和机械性能的影响。试验结果表明:未添加贝壳微粉的水泥内部可见层片层堆叠形态,整体较为疏松,而贝壳微粉的加入有助于水泥获得更加致密、稳定的内部结构,且贝壳微粉的加入不会影响半水硫酸钙结晶。贝壳微粉的加入会改变水泥基浆料的凝固特性,并使得初凝时间与终凝时间分别延长6.5~16.2 min和8.2~21.4 min,可注射时间最大可延长至(9±1.5)min。在水泥中加入贝壳微粉后,水泥的内部结构会因为贝壳微粉与体系中的半水硫酸钙交互反应而发生不同程度改变,贝壳微粉加量为12%时复合水泥的溶胀率最大。加入贝壳微粉后水泥的压缩强度有不同程度减小,且随着贝壳微粉加量为12%时,对水泥的压缩强度影响最小。研究结果为贝壳微粉应用于耐火水泥材料提供了试验依据。Replacing traditional cement-based materials with shell powder can significantly reduce building material costs while achieving waste utilization.Shell micro powder based refractory cement was prepared using a reaction kettle hydrothermal method.The effects of shell micro powder addition on the morphology,phase composition,injectability and solidification,swelling and mechanical properties of shell micro powder based cement were studied through various means such as scanning electron microscopy,X-ray diffraction,infrared spectroscopy,cement consistency tester,and universal material testing machine.Eexperimental results showed that the cement without the addition of shell micro powder had a visible layer by layer stacking shape,which was relatively loose overall.The addition of shell micro powder helped the cement to obtain a denser and more stable internal structure and the addition of shell micro powder didn′t affect the crystallization of hemihydrate calcium sulfate.The addition of shell micro powder would change the solidification characteristics of cementitious slurry,and prolong the initial and final setting times from 6.5 min to 16.2 min and from 8.2 min to 21.4 min,respectively.The maximum injectable time could be extended to(9±1.5)minutes.After adding shell micro powder to cement,the internal structure of cement would undergo varying degrees of changes due to the interaction reaction between shell micro powder and hemihydrate calcium sulfate in the system.The swelling rate of shell micro powder based cement was the highest when the amount of shell micro powder added was 12%.After adding shell micro powder,the compressive strength of cement decreased to varying degrees and the effect on the compressive strength of cement was minimal when the amount of shell micro powder was 12%.The research results provide experimental basis for the application of shell micro powder in refractory cement materials.

关 键 词：贝壳微粉 水泥 加入量 可注射性及凝固性 机械性能 

分 类 号：TU528.041[建筑科学—建筑技术科学]