Anti-MgSO4 Erosion Performance of Soda Residue-Ground Granulated Blast Furnace Slag Solidified Soil Modified by Nano-Silica

Abstract

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

CLC Number:

TU411.3

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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Anti-MgSO₄ Erosion Performance of Soda Residue-Ground Granulated Blast Furnace Slag Solidified Soil Modified by Nano-Silica

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