掺珊瑚砂粉砂浆抗硫酸镁侵蚀性能研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (4): 1380-1387.

掺珊瑚砂粉砂浆抗硫酸镁侵蚀性能研究

马英, 李淯伟, 邰安

南京工业大学材料科学与工程学院,南京 211816

收稿日期:2023-11-01 修订日期:2023-12-13 出版日期:2024-04-15 发布日期:2024-04-17
作者简介:马英(1990—),女,博士,副教授。主要从事低碳胶凝材料和固废建材资源化利用的研究。E-mail:maying@njtech.edu.cn
基金资助:
国家自然科学基金青年科学基金(51802151)

Magnesium Sulfate Attack Resistance of Mortar with Coral Sand Powder

MA Ying, LI Yuwei, TAI An

College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China

Received:2023-11-01 Revised:2023-12-13 Online:2024-04-15 Published:2024-04-17

摘要/Abstract

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。

关键词: 珊瑚砂粉, 硫酸镁侵蚀, 碳硫硅钙石, 粉煤灰, 矿渣, 硅灰

Abstract: 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 (MgSO₄) 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.

Key words: coral sand powder, magnesium sulfate attack, thaumasite, fly ash, slag, silica fume

中图分类号:

TU528.01

马英, 李淯伟, 邰安. 掺珊瑚砂粉砂浆抗硫酸镁侵蚀性能研究[J]. 硅酸盐通报, 2024, 43(4): 1380-1387.

MA Ying, LI Yuwei, TAI An. Magnesium Sulfate Attack Resistance of Mortar with Coral Sand Powder[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(4): 1380-1387.

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