不同矿物掺合料对改性硫氧镁水泥性能影响的研究  

Effects of Different Mineral Admixtures on Properties of Modified Magnesium Oxysulfate Cement

作　　者：闫浩康 王硕 时绪智 袁兴栋[1] 隋玉武[1] 岳雪涛[1] YAN Haokang;WANG Shuo;SHI Xuzhi;YUAN Xingdong;SUI Yuwu;YUE Xuetao(School of Materials Science and Engineering,Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]山东建筑大学材料科学与工程学院,济南250101

出　　处：《硅酸盐通报》2022年第1期27-32,共6页Bulletin of the Chinese Ceramic Society

基　　金：山东省重点研发计划(公益性科技攻关类)(2019GSF109108)。

摘　　要：为探究矿物掺合料对改性硫氧镁水泥的影响及作用机理,分别将不同掺量的粉煤灰、矿粉掺入改性硫氧镁水泥中,对其力学性能、耐水性和耐酸性进行测试,并结合X射线衍射和扫描电镜对其物相组成及微观形貌进行表征和分析。研究结果表明:粉煤灰的掺入会提高改性硫氧镁水泥的3 d强度,但后期强度有所下降,当粉煤灰掺量大于20%(质量分数)时,其28 d抗压强度相较于基准组损失了14.7%;掺入矿粉对改性硫氧镁水泥的前期强度影响较小,并导致后期强度下降,当矿粉掺量为30%~40%(质量分数)时,水泥的28 d强度损失率高达17.3%。适量的粉煤灰与矿粉均能够提升改性硫氧镁水泥的耐水性和耐硫酸腐蚀性,其中水泥的耐硫酸腐蚀性随着粉煤灰掺量的增加而增强,耐硫酸腐蚀效果最好时矿粉掺量为20%。In order to investigate the effect of mineral admixtures on modified magnesium oxysulfate cement and its mechanism,different amounts of fly ash and mineral powder were blended into the modified magnesium oxysulfate cement,and the mechanical properties,water resistance and acid resistance were studied.The composition and microstructure of the material phase were characterized and analyzed by X-ray diffraction and scanning electron microscopy,respectively.The results show that the incorporation of fly ash will increase the 3 d strength of modified magnesium oxysulfate cement,and the later strength decreases,its 28 d compressive strength loses 14.7%compared with the reference group when the fly ash dosage is more than 20%(mass fraction).The incorporation of mineral powder has little effect on the preliminary strength of modified magnesium oxysulfate cement,and makes the later strength decrease,and the 28 d strength loss rate of the cement is as high as 17.3%when the mineral powder dosage is 30%to 40%(mass fraction).Both fly ash and mineral powder are able to enhance the water resistance and sulfuric acid corrosion resistance of modified magnesium oxysulfate cement,where the corrosion resistance of cement is enhanced with the increase of fly ash admixture,and the best dosage of mineral powder with the best sulfuric acid corrosion resistance is 20%.

关 键 词：镁质胶凝材料 改性硫氧镁水泥 矿物掺合料 粉煤灰 矿粉 耐水性能 耐酸性能 力学性能 

分 类 号：TU526[建筑科学—建筑技术科学] TQ177.5[化学工程—硅酸盐工业]