纳米硅粉改良碱渣-矿渣固化淤泥的抗硫酸镁侵蚀性能

摘要/Abstract

摘要： 利用纳米硅粉对碱渣-矿渣固化淤泥抗硫酸镁侵蚀性能进行改良,对MgSO₄溶液浸泡后的固化淤泥试样开展无侧限抗压强度、核磁共振和X射线衍射试验,研究硅粉掺量、养护龄期、浸泡时间对固化淤泥强度的影响规律及其微观机理。研究表明:在标准养护条件下,当硅粉掺量为3%(质量分数)时固化淤泥试样的孔隙体积最小,无侧限抗压强度最大,生成水化铝酸钙等产物。在MgSO₄侵蚀环境下,标准养护7 d试样具有很好的抗侵蚀能力,当硅粉掺量为3%(质量分数)时固化淤泥抗MgSO₄侵蚀能力最好,无侧限抗压强度随浸泡时间的增加而增大;标准养护28和60 d时,固化淤泥抗MgSO₄侵蚀能力减弱。建立了固化淤泥无侧限抗压强度与硅粉掺量及浸泡时间的关系式,预测了最危险条件和最低强度。适量的纳米硅粉可增加固化淤泥中水化速度和程度,减少钙矾石的生成量及其不利影响,达到提高碱渣固化淤泥抗MgSO₄侵蚀性能的目的。

关键词: 纳米硅粉, 碱渣, 海相淤泥, MgSO₄侵蚀, 无侧限抗压强度, 微观结构

Abstract: Nano-silica was used to improve the anti-MgSO₄ erosion performance of solidified soil with soda residue and ground granulated blast furnace slag. The unconfined compressive strength (UCS), nuclear magnetic resonance and X-ray diffraction tests were carried out on solidified soil soaked in MgSO₄ solution. The influences of nano-silica content, curing time and soaking time on strength and microstructure of solidified soil were studied. The results show that the sample with 3%(mass fraction) nano-silica content shows the smallest pore volume and highest UCS, and the products such as calcium aluminate hydrate are generated under standard maintenance conditions. In MgSO₄ erosion environment,the samples cured for 7 d have good erosion resistance. When the silica powder content is 3% (mass fraction), the solidified soil has the best anti-MgSO₄ erosion performance, and the unconfined compressive strength increases with the increase of soaking time. For the samples cured for 28 and 60 d, theanti-MgSO₄ erosion performance is weaker. The functional relationship between UCS of solidified soil and nano-silica content and soaking time is given, and the minimum UCS is predicted. Appropriate nano-silica promotes the hydration rate and degree for solidified soil and reduces the generation of ettringite and its adverse effects, which improves anti-MgSO₄ erosion performance for solidified soil with soda residue.

Key words: nano-silica, soda residue, marine soft soil, MgSO₄ erosion, unconfined compressive strength, microstructure

中图分类号:

TU411.3

何俊, 管家贤, 吕晓龙, 张驰. 纳米硅粉改良碱渣-矿渣固化淤泥的抗硫酸镁侵蚀性能[J]. 硅酸盐通报, 2023, 42(4): 1344-1352.

HE Jun, GUAN Jiaxian, LYU Xiaolong, ZHANG Chi. Anti-MgSO₄ Erosion Performance of Soda Residue-Ground Granulated Blast Furnace Slag Solidified Soil Modified by Nano-Silica[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(4): 1344-1352.

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