Journal of South China University of Technology(Natural Science) >

2023 , Vol. 51 >Issue 11: 63 - 73

DOI: https://doi.org/10.12141/j.issn.1000-565X.220784

Materials Science & Technology

Effect of Particle Size on Hydration Kinetics and Microstructure Development of Recycled Brick Powder-Cement Pastes

  • YU Qijun ,
  • MA Ting ,
  • ZHANG Tongsheng ,
  • GUO Yiqun ,
  • CHEN Canfeng ,
  • WU Zhengde ,
  • WEI Jiangxiong
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  • 1.School of Materials Science and Engineering，South China University of Technology，Guangzhou 510640，Guangdong，China
    2.Guangdong Research Center of Low Carbon Construction Materials Technology，Guangzhou 510640，Guangdong，China
    3.School of Civil and Hydraulic Engineering，Hefei University of Technology，Hefei 230009，Anhui，China
    4.Guangzhou Guangda Environmental Protection Technology Investment Co. ，Ltd. ，Guangzhou 511300，Guangdong，China
余其俊（1963-），男，博士，教授，主要从事水泥低能耗制备与高效应用及环境影响研究。E-mail:concyuq@scut.edu.cn

Received date: 2022-11-28

  Online published: 2023-01-17

Supported by

the National Key R&D Program of China(2020YFC1909902);the National Natural Science Foundation of China(52122201);the Key R&D Program of Ningxia Autonomous Region(2022BDE02002)

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Abstract

With the advancement of urbanization and the transformation of the old city, the production and stock of construction waste in China are ever increasing, with waste clay bricks accounting for 50%~70%. It has been found that recycled brick powder has the potential as a supplementary cementitious material, but it can lead to a significant reduction in the mechanical properties of cement-based materials. In order to explore the effect of particle size on the activity of recycled brick powder and the hydration kinetics of cement, this study prepared recycled brick powder with different particle sizes by high-energy ball milling. The physical and chemical properties and hydration activity of recycled brick powder were characterized. The effect of particle size of recycled brick powder on the hydration process, microstructure and mechanical properties of recycled brick powder-silicate cement system was analyzed. Based on the Krstulovic-Dabic model, the hydration kinetic parameters of the system were obtained to realize the quantitative evaluation of the hydration process. The results show that with the decrease of the particle size of the recycled brick powder, the lattice distortion of the silicon-aluminum mineral becomes larger and the surface binding energy decreases, resulting in an increase in its hydration activity. The early hydration of recycled brick powder mainly plays a physical filling role, which can accelerate the early hydration of recycled brick powder-cement system and improve the hydration degree of crystallization nucleation and crystal growth→phase boundary reaction→diffusion process. With the decrease of particle size of recycled brick powder, the starting time of pozzolanic reaction is advanced and the degree of pozzolanic reaction is higher. Finally, the later strength of cement mixed with 30% fine-grained recycled brick powder exceeds that of pure cement. This paper lays a foundation for the efficient application of recycled brick powder in cement-based materials.

Key words： recycled brick powder; particle size; hydration kinetics; compressive strength; microstructure development

Cite this article

YU Qijun , MA Ting , ZHANG Tongsheng , GUO Yiqun , CHEN Canfeng , WU Zhengde , WEI Jiangxiong . Effect of Particle Size on Hydration Kinetics and Microstructure Development of Recycled Brick Powder-Cement Pastes[J]. Journal of South China University of Technology(Natural Science), 2023 , 51(11) : 63 -73 . DOI: 10.12141/j.issn.1000-565X.220784

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