掺珊瑚砂粉砂浆抗硫酸镁侵蚀性能研究  

Magnesium Sulfate Attack Resistance of Mortar with Coral Sand Powder

作　　者：马英 李淯伟 邰安 MA Ying;LI Yuwei;TAI An(College of Materials Science and Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]南京工业大学材料科学与工程学院,南京211816

出　　处：《硅酸盐通报》2024年第4期1380-1387,共8页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金青年科学基金(51802151)。

摘　　要：本文研究了硫酸镁作用下掺珊瑚砂粉(CSP)和辅助胶凝材料(SCMs)砂浆的抗硫酸镁侵蚀性能。在5和20℃硫酸镁溶液中侵蚀至365 d,通过外观、长度变化、抗压强度,结合X射线衍射谱和傅里叶变换红外光谱分析砂浆的抗硫酸镁侵蚀性能。发现在5℃的硫酸镁溶液中侵蚀至365 d时,掺CSP砂浆发生严重劣化。掺20%(质量分数)CSP的抗硫酸盐硅酸盐水泥比掺20%(质量分数)CSP的普通硅酸盐水泥表现出更好的抗硫酸镁侵蚀性能。在5℃下粉煤灰和矿渣有助于改善掺CSP砂浆的抗硫酸镁侵蚀性能,然而在20℃下硅灰降低其抗硫酸镁侵蚀性能。在5℃下掺CSP砂浆主要发生镁盐和碳硫硅钙石型硫酸盐侵蚀并伴随少量石膏生成,在20℃下主要发生镁盐和石膏型硫酸盐侵蚀。This paper investigated the magnesium sulfate resistance of mortar incorporating coral sand powder(CSP)combined with supplementary cementitious materials(SCMs).With erosion in magnesium sulfate(MgSO 4)solution at 5 and 20℃ for 365 d,the magnesium sulfate attack resistance of mortar was analyzed through appearance,length change,compressive strength,X-ray diffraction pattern and Fourier transform infrared spectroscopy.It is found that the mortar with CSP deteriorates seriously when it is eroded to 365 d in magnesium sulfate solution at 5℃.Sulfate resistantance Portland cement(SRPC)with 20%(mass fraction)CSP exhibits better magnesium sulfate attack resistance than ordinary Portland cement(OPC)with 20%(mass fraction)CSP.Fly ash and slag can effectively improve the magnesium sulfate attack resistance of mortar with CSP at 5℃,while silica fume reduces the magnesium sulfate attack resistance at 20℃.At 5℃,the mortar with CSP mainly undergos magnesium and thaumasite sulfate corrosion accompanied by a small amount of gypsum generation,while at 20℃,magnesium and gypsum-type sulfate corrosion mainly occurs.

关 键 词：珊瑚砂粉 硫酸镁侵蚀 碳硫硅钙石 粉煤灰 矿渣 硅灰 

分 类 号：TU528.01[建筑科学—建筑技术科学]