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作者:

Zhang, Mo (Zhang, Mo.) | He, Meng (He, Meng.) | Pan, Zhu (Pan, Zhu.)

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摘要:

The efflorescence problem is always an intractable problem for geopolymer. Silica fume (SF), nano-silica (NS), 5A zeolite (ZL) and nano-silica treated with silane (NST), were used to mitigate the efflorescence of fly ash (FA) granulated blast furnace slag (GBFS) - steel slag (SS) based geopolymer. The effect of their dosages on the efflorescence was evaluated through accelerated efflorescing, leaching and unconfined compressive strength (UCS) tests. The inhibition mechanisms were explored by XRD, SEM, FTIR and MIP characterization. It revealed that SF and NS presented the most effective mitigating effect on efflorescence, with 9 % of SF and 2 % of NS totally inhibiting efflorescence and improving the compressive strength, and ZL and NST also alleviated the efflorescence at appropriate contents. Optimizing pore network and stabilizing free alkali were found to be the most important aspects for inhibiting efflorescence. The SF and NS worked efficiently in both two ways, which contained a large amount of dissolvable silicate that reacted with the excessive alkali to form C(N)-A-S-H and CS-H gels. This filled and reduced the pores from 26 nm to less than 10 nm, and stabilized alkali with reduce the free w(Na+) by more than 50.45 %. On the other hand, ZL can solidify free alkali through the ion exchange property and fill pores due to its microaggregate nature, and NST reduced the efflorescence through blocking free alkali migration paths by hydrophobicity of the pores. These findings would guide the selection of appropriate methods to solve the efflorescence problem of geopolymers.

关键词:

Nano-silica Steel slag Silica fume Geopolymer Efflorescence mitigation

作者机构:

  • [ 1 ] [Zhang, Mo]Hebei Univ Technol, Sch Civil & Transportat Engn, Tianjin 300401, Peoples R China
  • [ 2 ] [He, Meng]Hebei Univ Technol, Sch Civil & Transportat Engn, Tianjin 300401, Peoples R China
  • [ 3 ] [Pan, Zhu]Hebei Univ Technol, Sch Civil & Transportat Engn, Tianjin 300401, Peoples R China
  • [ 4 ] [Zhang, Mo]Smart Infrastruct Res Inst, 5340 Xiping Rd, Tianjin 300401, Peoples R China
  • [ 5 ] [Pan, Zhu]Smart Infrastruct Res Inst, 5340 Xiping Rd, Tianjin 300401, Peoples R China
  • [ 6 ] [He, Meng]Beijing Univ Technol, Fac Architecture Civil & Transportat Engn, Beijing 100124, Peoples R China

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来源 :

CERAMICS INTERNATIONAL

ISSN: 0272-8842

年份: 2024

期: 22

卷: 50

页码: 48538-48550

5 . 2 0 0

JCR@2022

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