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Mitigating the autogenous shrinkage of alkali-activated slag by metakaolin

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Abstract
This study investigates the effectiveness of metakaolin (MK) in mitigating the autogenous shrinkage of alkali activated slag (AAS). It is found that the autogenous shrinkage of AAS paste can be reduced by 40% and 50% when replacing 10% and 20% slag with MK, respectively. By providing additional Si and Al, and decreasing the pH of the pore solution, the incorporation of MK retards the formation of aluminium-modified calcium silicate hydrate (CASH) gels, the main reaction products in the studied pastes. The chemical shrinkage and pore refinement are consequently mitigated, resulting in a substantial reduction in the pore pressure. Meanwhile, the elastic modulus of AAS paste is only slightly influenced after MK addition. As a result, the autogenous shrinkage of AAS is significantly mitigated by incorporating MK. In addition, the introduction of MK would extend the setting time, slightly decrease the compressive strength, but greatly increase the flexural strength of AAS.
Keywords
BLAST-FURNACE SLAG, C-S-H, CALCIUM-SILICATE-HYDRATE, FLY-ASH, DRYING, SHRINKAGE, REACTION-KINETICS, MECHANICAL-PROPERTIES, REDUCING, ADMIXTURES, AMBIENT-TEMPERATURE, CEMENT, Slag, Shrinkage, Mitigation, Metakaolin, Mechanical properties

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MLA
Li, Zhenming, et al. “Mitigating the Autogenous Shrinkage of Alkali-Activated Slag by Metakaolin.” CEMENT AND CONCRETE RESEARCH, vol. 122, 2019, pp. 30–41, doi:10.1016/j.cemconres.2019.04.016.
APA
Li, Z., Nedeljkovic, M., Chen, B., & Ye, G. (2019). Mitigating the autogenous shrinkage of alkali-activated slag by metakaolin. CEMENT AND CONCRETE RESEARCH, 122, 30–41. https://doi.org/10.1016/j.cemconres.2019.04.016
Chicago author-date
Li, Zhenming, Marija Nedeljkovic, Boyu Chen, and Guang Ye. 2019. “Mitigating the Autogenous Shrinkage of Alkali-Activated Slag by Metakaolin.” CEMENT AND CONCRETE RESEARCH 122: 30–41. https://doi.org/10.1016/j.cemconres.2019.04.016.
Chicago author-date (all authors)
Li, Zhenming, Marija Nedeljkovic, Boyu Chen, and Guang Ye. 2019. “Mitigating the Autogenous Shrinkage of Alkali-Activated Slag by Metakaolin.” CEMENT AND CONCRETE RESEARCH 122: 30–41. doi:10.1016/j.cemconres.2019.04.016.
Vancouver
1.
Li Z, Nedeljkovic M, Chen B, Ye G. Mitigating the autogenous shrinkage of alkali-activated slag by metakaolin. CEMENT AND CONCRETE RESEARCH. 2019;122:30–41.
IEEE
[1]
Z. Li, M. Nedeljkovic, B. Chen, and G. Ye, “Mitigating the autogenous shrinkage of alkali-activated slag by metakaolin,” CEMENT AND CONCRETE RESEARCH, vol. 122, pp. 30–41, 2019.
@article{8694429,
  abstract     = {{This study investigates the effectiveness of metakaolin (MK) in mitigating the autogenous shrinkage of alkali activated slag (AAS). It is found that the autogenous shrinkage of AAS paste can be reduced by 40% and 50% when replacing 10% and 20% slag with MK, respectively. By providing additional Si and Al, and decreasing the pH of the pore solution, the incorporation of MK retards the formation of aluminium-modified calcium silicate hydrate (CASH) gels, the main reaction products in the studied pastes. The chemical shrinkage and pore refinement are consequently mitigated, resulting in a substantial reduction in the pore pressure. Meanwhile, the elastic modulus of AAS paste is only slightly influenced after MK addition. As a result, the autogenous shrinkage of AAS is significantly mitigated by incorporating MK. In addition, the introduction of MK would extend the setting time, slightly decrease the compressive strength, but greatly increase the flexural strength of AAS.}},
  author       = {{Li, Zhenming and Nedeljkovic, Marija and Chen, Boyu and Ye, Guang}},
  issn         = {{0008-8846}},
  journal      = {{CEMENT AND CONCRETE RESEARCH}},
  keywords     = {{BLAST-FURNACE SLAG,C-S-H,CALCIUM-SILICATE-HYDRATE,FLY-ASH,DRYING,SHRINKAGE,REACTION-KINETICS,MECHANICAL-PROPERTIES,REDUCING,ADMIXTURES,AMBIENT-TEMPERATURE,CEMENT,Slag,Shrinkage,Mitigation,Metakaolin,Mechanical properties}},
  language     = {{eng}},
  pages        = {{30--41}},
  title        = {{Mitigating the autogenous shrinkage of alkali-activated slag by metakaolin}},
  url          = {{http://dx.doi.org/10.1016/j.cemconres.2019.04.016}},
  volume       = {{122}},
  year         = {{2019}},
}

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