- 目录
- 建筑石膏与胶凝材料
- 首页
复掺纳米TiO2和稻壳灰的铁尾矿砂水泥砂浆性能研究
作者：韩守杰1，王玉雅1，余沛1，邓子琦2，杨丽萍2
（1.商丘工学院 土木工程学院，河南 商丘 476000；2.中国建筑第二工程局有限公司，北京 100010）
摘要：以纳米TiO2和稻壳灰取代部分水泥，研究纳米TiO2对铁尾矿砂水泥砂浆强度与耐久性能的影响。试验结果表明：复掺纳米TiO2和稻壳灰可有效提高铁尾矿砂水泥砂浆的抗压和抗折强度，当纳米TiO2掺量为3%时，铁尾矿砂水泥砂浆强度达到最高；复掺20%稻壳灰和3%纳米TiO2的铁尾矿砂水泥砂浆的氯离子扩散系数最低，90 d氯离子扩散系数较基准组降低42.6%；掺入纳米TiO2和稻壳灰可明显改善铁尾矿砂水泥砂浆的抗硫酸盐侵蚀性能，在5%Na2SO4溶液中浸泡60 d后，复掺20%稻壳灰和3%纳米TiO2的铁尾矿砂水泥砂浆的质量损失率和强度损失率较基准组减小50%左右。
关键词：纳米TiO2；稻壳灰；铁尾矿砂水泥砂浆；耐久性
中图分类号：TU528 文献标识码：A 文章编号：1001-702X（2020）06-0022-04
An experimental study on properties of iron ore sand cement mortar mixed with nano-TiO2 and rice husk ash
HAN Shoujie1，WANG Yuya1，YU Pei1，DENG Ziqi2，YANG Liping2
（1.School of Civil Engineering，Shangqiu Institute of Technology，Shangqiu 476000，China；
2.China Construction Second Engineering Bureau Ltd.，Beijing 100010，China）
Abstract：The effects of nano-TiO2 and rice husk ash on the strength and durability of iron ore sand cement mortar were investigated in this paper by partially substituting cement with nano-TiO2 and rice husk ash. The results indicate that：the compressive strength and flexure strength of iron ore sand cement mortar can be effectively improved when mixed with nano-TiO2 and rice husk ash. Specifically，when the content of nano-TiO2 is 3%，the maximum strength of iron ore sand cement mortar occurs；the chloride ions diffusion coefficient of iron ore sand cement mortar incorporated with 20% rice husk ash and 3% nano-TiO2 reaches the minimum，and its chloride ions diffusion coefficient is 42.6% lower than that of the reference group after curing for 90 d；the addition of nano-TiO2 and rice husk ash can evidently enhance the sulfate corrosion resistance of iron ore sand cement mortar. After soaking in 5% Na2SO4 solution for 60 days，the mass loss rate and strength loss rate of iron ore sand cement mortar mixed with 20% rice husk ash and 3% nano-TiO2 are nearly 50% lower than those of the reference group.
Key words：nano-TiO2，rice husk ash，iron ore sand cement mortar，durability