冻融循环作用下锂渣混凝土抗硫酸盐侵蚀研究
|
摘要
基于锂渣的微集料效应和活性效应研究了冻融循环作用下锂渣不同掺量对混凝土的抗硫酸盐侵蚀性能,同时利用扫描电镜和压汞法探究分析了冻融循环作用下锂渣混凝土在硫酸盐侵蚀作用下的形貌变化和孔结构变化。结果表明:锂渣能有效增加混凝土在冻融循环作用下的抗硫酸盐侵蚀,且随着锂渣掺量的增加,混凝土的抗硫酸盐侵蚀性能越优;冻融循环作用下混凝土在硫酸盐溶液中生成的腐蚀产物是钙矾石,;掺加锂渣能有效改善混凝土的孔结构,掺加30%锂渣混凝土在硫酸盐溶液中冻融循环420次之后的孔隙率为17. 9%,而不掺加锂渣混凝土的孔隙率为29. 1%。
The corrosion resistance of concrete of different lithium slag content under the freezing and thawing cycles is studied,based on the micro aggregate effect and active effect of lithium slag. The changes of morphology and pore structure of concrete with lithium slag under sulfate attack were analyzed by scanning electron microscope( SEM),mercury intrusion porosimetry( MIP). The results show that the lithium slag can increase the sulfate resistance of concrete in freeze-thaw cycles effectively,and with the increase of the lithium slag content,the sulfate resistance of concrete is excellent; The corrosion product of concrete exposed to the 5% Na2 SO4 solution under freezing and thawing cycles is ettringite;The porosity of concrete is improved by adding lithium slag effectively. The porosity of concrete with 30%lithium slag is 17. 9% after freezing and thawing 420 cycles in 5% Na2 SO4 solution,and the porosity of concrete without lithium slag is 29. 1%.
The corrosion resistance of concrete of different lithium slag content under the freezing and thawing cycles is studied,based on the micro aggregate effect and active effect of lithium slag. The changes of morphology and pore structure of concrete with lithium slag under sulfate attack were analyzed by scanning electron microscope( SEM),mercury intrusion porosimetry( MIP). The results show that the lithium slag can increase the sulfate resistance of concrete in freeze-thaw cycles effectively,and with the increase of the lithium slag content,the sulfate resistance of concrete is excellent; The corrosion product of concrete exposed to the 5% Na2 SO4 solution under freezing and thawing cycles is ettringite;The porosity of concrete is improved by adding lithium slag effectively. The porosity of concrete with 30%lithium slag is 17. 9% after freezing and thawing 420 cycles in 5% Na2 SO4 solution,and the porosity of concrete without lithium slag is 29. 1%.
引文
[1] Neville A. The confused world of sulfate attack on concrete[J]. Cement and Concrete Research,2004,34:1275-1296.
[2] Stroh J,Schlegel M C. Applying high resolution SyXRD analysis on sulfate attacked concrete field samples[J]. Cement and Concrete Research,2014,66:19-26.
[3]刘赞群.混凝土硫酸盐侵蚀基本机理研究[D].长沙:中南大学,2009.
[4] Stroh J,Meng B. Monitoring of sulphate attack on hardened cement paste studied by synchrotron XRD[J]. Solid State Science,2015,48:278-285.
[5] Liu Z,Schutter G D. Micro-analysis of the role of interfacial transition zone in“salt weathering”on concrete[J]. Construction and Building Materials,2010,24:2052-2059.
[6] Liu Z,Deng D. Chemical sulfate attack performance of partially exposed cement and cement+fly ash paste[J]. Construction and Building Materials,2012,28:230-237.
[7] Sun C,Chen J. A new diffusion model of sulfate ions in concrete[J]. Construction and Building Materials,2013,39:39-45.
[8]李春红.浅谈锂渣在建材工业中的研究与应用[J].世界有色金属,2000(10):21-24.
[9]张兰芳.锂渣混凝土的试验研究[J].混凝土,2008(4):44-46.
[10]张兰芳.高性能锂渣混凝土的试验研究[J].辽宁工程技术大学学报,2007,26(6):877-880.
[11]苑立冬,牛荻涛,姜磊.硫酸盐侵蚀与冻融循环共同作用下混凝土损伤研究[J].硅酸盐通报,2013,32(6):1171-1176.
[12]温勇,徐虎,韩东明.锂渣粉对水泥基材料的抗硫酸盐侵蚀性能的影响[J].混凝土,2010(12):90-92.
[2] Stroh J,Schlegel M C. Applying high resolution SyXRD analysis on sulfate attacked concrete field samples[J]. Cement and Concrete Research,2014,66:19-26.
[3]刘赞群.混凝土硫酸盐侵蚀基本机理研究[D].长沙:中南大学,2009.
[4] Stroh J,Meng B. Monitoring of sulphate attack on hardened cement paste studied by synchrotron XRD[J]. Solid State Science,2015,48:278-285.
[5] Liu Z,Schutter G D. Micro-analysis of the role of interfacial transition zone in“salt weathering”on concrete[J]. Construction and Building Materials,2010,24:2052-2059.
[6] Liu Z,Deng D. Chemical sulfate attack performance of partially exposed cement and cement+fly ash paste[J]. Construction and Building Materials,2012,28:230-237.
[7] Sun C,Chen J. A new diffusion model of sulfate ions in concrete[J]. Construction and Building Materials,2013,39:39-45.
[8]李春红.浅谈锂渣在建材工业中的研究与应用[J].世界有色金属,2000(10):21-24.
[9]张兰芳.锂渣混凝土的试验研究[J].混凝土,2008(4):44-46.
[10]张兰芳.高性能锂渣混凝土的试验研究[J].辽宁工程技术大学学报,2007,26(6):877-880.
[11]苑立冬,牛荻涛,姜磊.硫酸盐侵蚀与冻融循环共同作用下混凝土损伤研究[J].硅酸盐通报,2013,32(6):1171-1176.
[12]温勇,徐虎,韩东明.锂渣粉对水泥基材料的抗硫酸盐侵蚀性能的影响[J].混凝土,2010(12):90-92.