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High value-added utilization of desulfurized building gypsum as self-leveling mortar: the comprehensive effect of cement

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Abstract

The utilization of desulfurized building gypsum as raw material for gypsum-based self-leveling mortar (GSL) is limited by its low strength and poor water resistance. The objective of this study is to enhance comprehensive properties of GSL and prepare qualified desulfurized building gypsum-based self-leveling mortar that can be effectively applied in practical engineering projects. The influence of cement on water consumption rate of initial fluidity (W/M ratio), fluidity, setting time, mechanical strength, and water resistance of GSL were evaluated. Additionally, rheological parameter, heat of hydration, crystal morphology, and pore structure were also analyzed. Cement significantly improved the fluidity of slurry. Moreover, the compressive strength and softening coefficient of GSL reached 20.6 MPa and 0.56 at 10% cement, respectively. Furthermore, cement reduced the 30-min-fluidity loss and improved fludity by reducing the yield stress and increasing the plastic viscosity of screed. The transformation of hydration kinetics of GSL could be due to Ca2+ and OH− released by cement, thus resulting in the shortening of initial setting time and the prolongation of the interval between initial and final setting time. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) showed that CSH gel and AFt crystal would generate on the surface of CaSO4·2H2O crystal, making the structure more compact. Mercury intrusion porosimetry (MIP) indicated that cement greatly reduced the porosity through the water reduction effect in the early stage and continuous hydration in the later stage. The continuous hydration of cement also increased the shrinkage rate. This work was expected to provide reference for promoting the application of desulfurized building gypsum as the high value-added screed.

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Data availability

The data presented in this study are available on request from the corresponding author.

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Funding

This study was financially supported and sponsored by the National Natural Science Foundation of China (Nos. 52100136 and 51902034) and State Key Laboratory of Solid Waste Reuse for Building Materials (No. SWR-2021–005).

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Authors and Affiliations

  1. School of Civil and Architectural Engineering, Yangtze Normal University, Chongqing, 408100, China

    Min Zhao

  2. School of Materials Science and Engineering, Chongqing University, Chongqing, 400045, China

    Puyue Fan, Jing Huang, Pengfei Leng & Jiahui Peng

  3. School of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing, 401331, China

    Mingtao Zhang

Authors
  1. Min Zhao
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  2. Puyue Fan
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  3. Mingtao Zhang
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  4. Jing Huang
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  5. Pengfei Leng
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  6. Jiahui Peng
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Contributions

Min Zhao: conceptualization, methodology, formal analysis, data curation, investigation, and writing—original draft. Puyue Fan: conceptualization, methodology, resources, supervision formal analysis, data curation, writing—original draft, visualization, and funding acquisition. Mingtao Zhang: data curation and investigation. Jing Huang: validation and funding acquisition. Pengfei Leng: resources and project administration. Jiahui Peng: validation and resources.

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Correspondence to Puyue Fan.

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Zhao, M., Fan, P., Zhang, M. et al. High value-added utilization of desulfurized building gypsum as self-leveling mortar: the comprehensive effect of cement. Environ Sci Pollut Res (2024). https://doi.org/10.1007/s11356-024-33224-x

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