Abstract
This paper studies the microstructure of stabilized clay polluted by landfill leachate at different temperatures. For this purpose, dynamic corrosion-stabilized clay was used to prepare mercury intrusion porosimetry and scanning electron microscopy samples by lyophilization. The results showed that a rise in temperature affects the pore structure of corrosion-stabilized clay. Macropores are easily produced when the temperature ranges from 40 to 60 °C, while cryptopores and ultramicropores appear in significant numbers if the temperature reaches 80 °C. The corresponding micrographs show a dispersed structure at temperatures of 40 to 60 °C and a clearly flower-like structure at 80 °C. Landfill leachate has obvious effects on the microstructure of stabilized clay. After corrosion processes, pore size is reduced while average pore radius is increased. Macropores increase and span a wider range. The peak of the pore size distribution curve shifts from the middle to both ends; porosity initially decreases and then increases. From the chemical point of view, this corrosion mechanism is mainly due to the growth of new material such as calcium chloro-aluminates, ettringite or dihydrate gypsum that were generated by the reaction between landfill leachate and stabilized clay.
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Acknowledgments
This study has been supported by the National Natural Science Foundation of China (No. 41202215). The authors would like to express their gratitude for this financial assistance.
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Hou, J., Li, J. & Chen, Y. Coupling effect of landfill leachate and temperature on the microstructure of stabilized clay. Bull Eng Geol Environ 78, 629–640 (2019). https://doi.org/10.1007/s10064-017-1099-z
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DOI: https://doi.org/10.1007/s10064-017-1099-z