Jian Liu, Jingwen Rong, Xiaoli Ji, Boyang Chen, Yuan Wang
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The 1-day compressive strength increased from 8.56 to 14.21 MPa, pointing out an improvement rate of 66.00%. It can be seen from the SEM images that a large number of fibrous C-S-H crystals and rod-shaped AFt crystals formed in the ternary composite cement sample. The nanosized silicon carbide (SiC) can accelerate the generation of hydration products through forming nucleation sites. As a dispersing agent polyvinyl alcohol (PVA) can effectively prevent the agglomeration of SiC nanoparticles and the formation of cement particle flocculation structure. On the other hand, the lithium cations and the sulfate anions of lithium sulfate could penetrate the hydration film structure and react with the hydration product Ca(OH)2, respectively, which promotes the hydration reaction. 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引用次数: 0
摘要
为解决煤矿井下早期传统封孔材料抗压强度低、封孔能力不稳定等问题,本研究以纳米材料、水溶性聚合物和锂盐为添加剂,掺入普通硅酸盐水泥,研制了一种新型水泥基封孔材料。通过单轴压缩试验、扫描电子显微镜(SEM)、热重分析和 X 射线衍射(XRD)对制备的水泥材料的早期强度和微观结构演变进行了研究。结果表明,三元复合材料(纳米碳化硅、聚乙烯醇和硫酸锂)能有效提高水泥的早期强度。1 天抗压强度从 8.56 兆帕提高到 14.21 兆帕,提高率达 66.00%。从扫描电镜图像可以看出,三元复合水泥样品中形成了大量纤维状的 C-S-H 晶体和棒状的 AFt 晶体。纳米碳化硅(SiC)可通过形成成核点加速水化产物的生成。作为分散剂的聚乙烯醇(PVA)可有效防止 SiC 纳米颗粒的团聚和水泥颗粒絮凝结构的形成。另一方面,硫酸锂中的锂阳离子和硫酸根阴离子可渗透水化膜结构,分别与水化产物 Ca(OH)2 发生反应,从而促进水化反应。三元复合材料对水化产物形成的促进作用使新型水泥基密封材料的早期强度明显提高。
Synergetic Effect Of Ternary Mixture Of Nano Silicon Carbide-Polyvinyl Alcohol-Lithium Sulfate On Early Strength Of Cement
T o solve the problems of low compressive strength and unstable sealing capability of traditional hole sealing materials in the early stage of underground coal mines, a new cement-based sealing material was developed in this study by mixing ordinary Portland cement with nanomaterial, water-soluble polymer and lithium salt as additives. The early strength and the microstructure evolution of the as-prepared cement material were investigated with uniaxial compression test, scanning electron microscope (SEM), thermogravimetric analysis and X-ray diffraction (XRD). The results show that the ternary composite material (nano silicon carbide, polyvinyl alcohol and lithium sulfate) can effectively improve the early strength of cement. The 1-day compressive strength increased from 8.56 to 14.21 MPa, pointing out an improvement rate of 66.00%. It can be seen from the SEM images that a large number of fibrous C-S-H crystals and rod-shaped AFt crystals formed in the ternary composite cement sample. The nanosized silicon carbide (SiC) can accelerate the generation of hydration products through forming nucleation sites. As a dispersing agent polyvinyl alcohol (PVA) can effectively prevent the agglomeration of SiC nanoparticles and the formation of cement particle flocculation structure. On the other hand, the lithium cations and the sulfate anions of lithium sulfate could penetrate the hydration film structure and react with the hydration product Ca(OH)2, respectively, which promotes the hydration reaction. The promotion effect of the ternary composite material on the formation of hydration products results in a clearly improved early strength of the new cement-based sealing material.
期刊介绍:
The Chiang Mai Journal of Science is an international English language peer-reviewed journal which is published in open access electronic format 6 times a year in January, March, May, July, September and November by the Faculty of Science, Chiang Mai University. Manuscripts in most areas of science are welcomed except in areas such as agriculture, engineering and medical science which are outside the scope of the Journal. Currently, we focus on manuscripts in biology, chemistry, physics, materials science and environmental science. Papers in mathematics statistics and computer science are also included but should be of an applied nature rather than purely theoretical. Manuscripts describing experiments on humans or animals are required to provide proof that all experiments have been carried out according to the ethical regulations of the respective institutional and/or governmental authorities and this should be clearly stated in the manuscript itself. The Editor reserves the right to reject manuscripts that fail to do so.