蛋壳粉对偏高岭土水泥基材料耐硫酸盐性的影响  

Effect of Eggshell Powder on Sulfate Resistance of Metakaolin Cement-based Materials

作　　者：胡春华 马腾 HU Chunhua;MA Teng(College of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan 430064,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,武汉430064

出　　处：《太原理工大学学报》2024年第5期874-880,共7页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(51178167)。

摘　　要：【目的】确定蛋壳粉和偏高岭土作为水泥替代材料时的最佳复合配合比,以提高水泥砂浆的强度和净浆的耐硫酸盐性。【方法】将蛋壳粉和偏高岭土以不同的质量比替代水泥来制作试件,分别测试了水泥砂浆强度和净浆耐硫酸盐性。通过综合分析两种测试结果得出蛋壳粉和偏高岭土复合水泥的最佳配合比。【结果】强度试验结果表明:掺量20%的偏高岭土对水泥强度提升最为显著,掺量增加到30%后水泥强度会明显降低。在固定20%偏高岭土掺量的基础上,掺入5%的蛋壳粉时,水泥砂浆的强度仍能保持在与偏高岭土掺量20%时相近的水平。但如果蛋壳粉掺量增加到10%,则水泥强度会明显降低。耐硫酸盐性试验结果表明,单独掺入10%和20%的偏高岭土会导致水泥基材料在硫酸盐环境中发生体积膨胀并且破碎,而在掺入蛋壳粉后则会缓解这一现象。单掺蛋壳粉试件与纯水泥试件表现出了相同的耐硫酸盐性。【结论】蛋壳粉和偏高岭土以适宜的比例复合使用,在提升强度的同时能保持耐硫酸盐性。【Purposes】 This work has been carried out to determine the optimal composite mix ratio of eggshell powder and metakaolin as cement replacement materials for simultaneously enhancing the compressive strength of cement mortar and the sulfate resistance of cement paste.【Methods】 Eggshell powder and metakaolin were used to replace cement to make specimens,and the strength of cement mortar and sulfate resistance of cement paste were tested separatehy.【Findings】 The strength test results show that 20% metakaolin content increases the cement strength most significantly,and the cement strength decreases significantly when the metakolin content increases to 30%.When the 20% metakaolin content is fixed and 5% eggshell powder is added,the cement mortar still maintains the strength close to that of cement mortar with 20% metakaolin.When the content of eggshell powder increases to 10%,the cement strength decreases obviously.The sulfate resistance test results show that the additions of 10% and 20% metakaolin lead to the volume expansion and fragmentation of cement-based materials in sulfate environment.After adding eggshell powder,this phenomenon is alleviated.The specimens with eggshell powder and pure cement show the same sulfate resistance.【Conclusions】 When the eggshell powder and metakaolin are compounded in an appropriate proportion,the strength of cement-based matenals can be improved and their sulfate resistance can be maintained at the same time.

关 键 词：蛋壳粉 偏高岭土 强度 硫酸盐侵蚀 膨胀开裂 

分 类 号：TU52[建筑科学—建筑技术科学]