| 摘要: |
| 研究了钠基膨润土和钙基膨润土对水泥基材料抗低温硫酸盐侵蚀性能的影响.将水泥石灰石粉试件浸泡在5℃,5%（质量分数）硫酸钠溶液中,用红外光谱(IR)和XRD分析了腐蚀产物.结果表明:水泥石灰石粉试件腐蚀程度随浸泡时间延长而增加,未掺膨润土的试件棱角发生明显脱落,腐蚀产物以碳硫硅钙石为主；在试件的腐蚀产物中,碳硫硅钙石的生成量随膨润土掺量增加逐渐减小,试件的腐蚀程度也逐渐减小；膨润土掺量相同时,钠基膨润土比钙基膨润土改善水泥石灰石粉胶凝材料低温下抗硫酸盐腐蚀性能的效果更好. |
| 关键词: 水泥基材料 膨润土 石灰石粉 碳硫硅钙石 |
| DOI：103969/j.issn1007 9629201601026 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51278497） |
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| Improvement of Resistance of Cementitious Materials to Sulfate Attack at Low Temperature by Bentonite |
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XIAO Jia, MENG Qingye, GUO Minglei, WU Ting
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School of Civil Engineering, Central South University, Changsha 410075, China
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| Abstract: |
| The effects of Na bentonite and Ca bentonite on resistance of cementitious materials to sulfate attack at low temperature were studied. The paste samples made from cement and limestone powder were immersed in 5%(by mass) Na2S04 solution at 5℃ and the corrosion products were analyzed by IR and XRD. It is indicated that the degree of corrosion of cement limestone powder specimens aggravated with immersion time. The specimens without bentonite fell off at edges and corners notably, and thaumastie was the main component of corrosion products. In corrosion products of specimens, the content of thaumasite generation decreases with the increase of bentonite content, and the corrosion degree of specimens decreases as well. When the use level of bentonite is the same, the effect of Na bentonite to improve resistance of the cement limestone powder cementitious material to sulfate attack at low temperature is greater than that of Ca bentonite. |
| Key words: cementitious material bentonite limestone powder thaumasite |
