Effect of Nano-SiO2 on Performance of Concrete in Dissolving/Crystalling Cycles of Salts
-
摘要: 为了改善混凝土在海水、土壤等盐环境中的性能,通过混凝土强度试验,研究了掺纳米SiO2混凝土在盐类结晶循环中的性能,并通过扫描电子显微镜(SEM)和X-射线衍射分析(XRD)对混凝土微观结构进行了研究.结果表明:纳米SiO2能够改善混凝土的性能;从性能和经济两方面考虑,推荐纳米SiO2的最佳掺量(质量分数)为1%.与基准混凝土相比,在110次循环后,掺纳米SiO21%的混凝土的耐腐蚀循环系数和相对耐腐蚀循环系数分别提高11%和20%.微观结构分析表明,纳米SiO2可以改善混凝土界面结构,降低氢氧化钙的含量.Abstract: To improve the performances of concrete in sea water or soil with inorganic salts,the performance of concrete with nano-SiO2 in dissolving/crystalling cycle of salts was investigated by the experiment of concrete strength,and the microstructure of concrete was analyzed with SEM(scanning electron microscope) and XRD(X-ray diffraction).The result shows that nano-SiO2 can improve the performances of concrete.By considering the performance of concrete and its construction cost,the optimum mass fraction of nano-SiO2 is 1%.Compared with normal concrete,modulus ratio and special modulus ratio of the concrete with 1%(mass fraction) nano-SiO2 in dissolving/crystalling cycle of salts increase by respectively 11% and 20% after 110 cycles.The analysis of the microstructure shows that nano-SiO2 can improve interface structure between cement and aggregate,and decrease the content of Ca(OH)2 in concrete.
-
Key words:
- nano-SiO2 /
- fly ash /
- concrete /
- dissolving/crystalling cycle of salt
-
金伟良,赵羽习.混凝土结构耐久性[M].北京:科学出版社,2002:9-11.[2] 曹楚南.中国材料的自然环境腐蚀[M].北京:化学工业出版社,2005:433-463.[3] LI Gengying.Properties of high-volume fly ash concrete incorporating nano-SiO2[J].Cement and Concrete Research,2004,34:1 043-1 049.[4] 李固华,高波.纳米微粉SiO2和CaCO3对混凝土性能的影响[J].铁道学报,2006,28(1):131-136.LI Guhua,GAO Bo.Effect of nano-SiO2 and nano-CaCO3 on concrete performance[J].Journal of the China Railway Society,2006,28(1):131-136.[5] 唐明,巴恒静,李颖.纳米级SiOx与硅灰对水泥基材料的复合改性效应研究[J].硅酸盐学报,2003,31(5):523-527.TANG Ming,BA Hengjing,LI Ying.Study on compound effect of silica fume and nano SiOx for cementing composite materials[J].Journal of the Chinese Ceramic Society,2003,31(5):523-527.[6] 冯乃谦.高性能混凝土结构[M].北京:机械工业出版社,2004:45-90.[7] 张玉敏,王铁成.人工海水对混凝土侵蚀性的研究[J].混凝土,2001(11):48-50.ZHANG Yumin,WANG Tiecheng.Investigation of corrosion of artificial seawater on concrete[J].Concrete,2001(11):48-50.[8] 苏胜,何向玲,王向东.多种离子作用下影响混凝土抗蚀性的研究[J].河北建筑科技学院学报,2000,17(4):32-34.SU Seng,HE Xiangling,WANG Xiangdong.Research on the influence on corrosion-resistance of concrete under many and varied ions[J].Journal of Hebei Institute of Architectural Science and Technology,2000,17(4):32-34.[9] LEA F M.水泥和混凝土化学[M].唐明述,杨南如,胡道和,等译.北京:中国建筑出版社,1984:768-769.[10] 叶青,张泽南,孔德玉.掺纳米SiO2和掺硅粉高强混凝土性能的比较[J].建筑材料学报,2003,6(4):381-385.YE Qing,ZHANG Zenan,KONG Deyu.Comparison of properties of high strength concrete with nano-SiO2 and silica fumeadded[J].Journal of Building Materials,2003,6(4):381-385. -
点击查看大图
计量
- 文章访问数: 1298
- HTML全文浏览量: 81
- PDF下载量: 407
- 被引次数: 0
下载: