| 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2164%，90d抗折强度提高25.94%. |
| 关键词: 纳米黏土 孔隙率 分散性 抗折强度 水泥 |
| DOI：10.3969/j.issn.1007 9629.2013.02.003 |
| 分类号: |
| 基金项目: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） |
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| Effect of Disperse Condition of Nano clay on Behavior of Cement Paste |
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ZHANG Shi yi, FAN Ying fang, LUAN Hai yang, CHEN Ye
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Institute of Road and Bridge Engineering, Dalian Maritime University, Dalian 116026, China
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| Abstract: |
| Disperse condition of nano clay in cement has a great effect on the property of the cement based materials. 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 nano clay modified cement were examined through some micro testing techniques(such as XRD, SEM and MIP test, etc). The influence of nano clay additives on the flexural strength of modified cement was investigated. The optimum additive was recommended. The results show that long duration dispersion with machine is a beneficial way to improve the disperse condition of nano clay in the cement based material.It is concluded that the addition of nano clay will improve the strength of the cement at early age. Comparing with the normal cement, the flexural strength of the cement with 3.00%(by mass) nano clay additive will increase 21.64% at 14 days, and will increase 25.94% at 90 days. |
| Key words: nano clay porosity dispersion flexural strength cement |
