纳米黏土分散性对水泥性能的影响  

Effect of Disperse Condition of Nano-clay on Behavior of Cement Paste

作　　者：张世义[1] 范颖芳[1] 栾海洋[1] 陈业[1] 

机构地区：[1]大连海事大学道路与桥梁工程研究所,辽宁大连116026

出　　处：《建筑材料学报》2013年第2期197-202,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51178069);新世纪优秀人才基金资助项目(NCET-11-0860);辽宁省百千万人才工程项目(2010921064);高校骨干教师基金资助项目(2011JC031)

摘　　要：纳米黏土在水泥基材料中的分散情况严重影响其性能,其中分散方式、分散时间和掺量是影响纳米黏土改性水泥性能的主要因素.利用XRD,SEM,压汞等试验手段从微观尺度揭示了纳米改性水泥基材料的改性机理,探讨了分散方式对纳米黏土在水泥基材料中分散特性的影响;研究了纳米黏土掺量对水泥强度的影响规律,得到了改善水泥抗折强度的纳米黏土最佳掺量.结果表明:机械分散、延长分散时间均能提高纳米黏土在水泥基材料中的分散性;纳米黏土能够提高水泥的早期抗折强度.掺入3.00%的纳米黏土对水泥抗折强度提高最明显,其14d抗折强度较普通水泥试件提高21.64%,90d抗折强度提高25.94%.Disperse condition of nanoclay in cement has a great effect on the property of the cement based materi als. Disperse method, disperse time and the amount of the additives are the major effective factors. The effects of the disperse method on the property of nanoclay modified cement were examined through some micro testing tech niques（such as XRD, SEM and MIP test, etc）. The influence of nanoclay additives on the flexural strength of modified cement was investigated. The optimum additive was recommended. The results show that longduration dispersion with machine is a beneficial way to improve the disperse condition of nanoclay in the cement based material. It is concluded that the addition of nanoclay will improve the strength of the ce ment at early age. Comparing with the normal cement, the flexural strength of the cement with 3.00%（by mass） nanoelay additive will increase 21.64% at 14 days, and will increase 25.94% at 90 days.

关 键 词：纳米黏土 孔隙率 分散性 抗折强度 水泥 

分 类 号：TQ172.12[化学工程—水泥工业]