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Influence of mechanical grinding on pozzolanic characteristics of circulating fluidized bed fly ash (CFA) and resulting consequences on hydration and hardening properties of blended cement

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Abstract

This paper investigates the influence of mechanical grinding on pozzolanic characteristics of circulating fluidized bed fly ash (CFA) from the dissolution characteristics, paste strength, hydration heat and reaction degree. Further, the hydration and hardening properties of blended cement containing different ground CFA are also compared and analyzed from hydration heat, non-evaporable water content, hydration products, pore structure, setting time and mortar strength. The results show that the ground CFA has a relatively higher dissolution rate of Al2O3 and SiO2 under the alkaline environment compared with that of raw CFA, and the pozzolanic reaction activity of ground CFA is gradually improved with the increase of grinding time. At the grinding time of 60 min, the pozzolanic reaction degree of CFA paste is improved from 6.32% (raw CFA) to 13.71% at 7 days and from 13.65 to 28.44% at 28 days, respectively. The relationships of pozzolanic reaction degree and grinding time of CFA also conform to a quadratic function. For ground CFA after a long-time grinding such as 60 min, the hydration heat and non-evaporable water content of blended cement containing CFA are significantly improved. Owing to relatively smaller particle size and higher activity of ground CFA, the blended cement paste has more hydration products, narrower pore size distribution and lower porosity. For macroscopic properties, with increase in grinding time of CFA, the setting time and strength of blended cement are gradually shortened and improved, respectively.

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Acknowledgements

This work was financially supported by Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education (No. 201602).

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Authors and Affiliations

  1. School of Civil Engineering, Sun Yat-sen University, Guangzhou, 510006, China

    Jihui Zhao

  2. Department of Civil Engineering, Tsinghua University, Beijing, 100084, China

    Jihui Zhao & Peiyu Yan

  3. School of Chemical and Environment Engineering, China University of Mining and Technology, Beijing, 100083, China

    Duanle Li, Dongmin Wang & Hao Wang

  4. Institute of Technical Information for Building Materials Industry of China, Beijing, 100024, China

    Shucong Liao

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  1. Jihui Zhao
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  2. Duanle Li
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  3. Shucong Liao
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  4. Dongmin Wang
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  5. Hao Wang
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Correspondence to Jihui Zhao or Peiyu Yan.

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Zhao, J., Li, D., Liao, S. et al. Influence of mechanical grinding on pozzolanic characteristics of circulating fluidized bed fly ash (CFA) and resulting consequences on hydration and hardening properties of blended cement. J Therm Anal Calorim 132, 1459–1470 (2018). https://doi.org/10.1007/s10973-018-7103-4

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  • DOI: https://doi.org/10.1007/s10973-018-7103-4

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