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Polylactic Acid Improves the Rheological Properties, and Promotes the Degradation of Sodium Carboxymethyl Cellulose-Modified Alkali-Activated Cement

Author

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  • Huijing Tan

    (School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China)

  • Xiuhua Zheng

    (School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China)

  • Chenyang Duan

    (School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China)

  • Bairu Xia

    (School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China)

Abstract

In consideration of the insolubility in water, sensitivity to heat and wide application in the oil and gas industry as a degradable additive, this paper introduces polylactic acid (PLA) to a self-degradable temporary sealing material (SDTSM) to investigate its effect on the SDTSM performance and evaluate its potential to improve the rheological properties and further promote the self-degradation of the material. The thermal degradation of PLA, the rheological properties, compressive strength, hydrated products and water absorption of SDTSMs with different PLA dosages were tested. The analysis showed that the addition of 2% PLA increased the fluidity by 13.18% and reduced the plastic viscosity by 38.04%, when compared to those of the SDTSM without PLA. PLA increased the water absorption of 200 °C-heated SDTSM and had small effect on the types but decreased the hydrate products of 85 °C-cured SDTSM, and created plenty of pores in 200 °C-heated SDTSM. PLA enhanced the self-degradation level of SDTSM by generating a large amount of pores in cement. These pores worked in two ways: one was such a large amount of pores led to a looser microstructure; the other was these pores made the water impregnate the cement more easily, and then made the dissolution of substances in the 200 °C-heated SDTSM progress faster to generate heat and to destruct the microstructure.

Suggested Citation

  • Huijing Tan & Xiuhua Zheng & Chenyang Duan & Bairu Xia, 2016. "Polylactic Acid Improves the Rheological Properties, and Promotes the Degradation of Sodium Carboxymethyl Cellulose-Modified Alkali-Activated Cement," Energies, MDPI, vol. 9(10), pages 1-17, October.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:10:p:823-:d:80489
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    References listed on IDEAS

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    1. Zhang, Yan-Jun & Guo, Liang-Liang & Li, Zheng-Wei & Yu, Zi-Wang & Xu, Tian-Fu & Lan, Cheng-Yu, 2015. "Electricity generation and heating potential from enhanced geothermal system in Songliao Basin, China: Different reservoir stimulation strategies for tight rock and naturally fractured formations," Energy, Elsevier, vol. 93(P2), pages 1860-1885.
    2. Olasolo, P. & Juárez, M.C. & Morales, M.P. & D´Amico, Sebastiano & Liarte, I.A., 2016. "Enhanced geothermal systems (EGS): A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 56(C), pages 133-144.
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    Cited by:

    1. Huijing Tan & Xiuhua Zheng & Long Chen & Kang Liu & Wenxi Zhu & Bairu Xia, 2019. "The Self-Degradation Mechanism of Polyvinyl Chloride-Modified Slag/Fly Ash Binder for Geothermal Wells," Energies, MDPI, vol. 12(14), pages 1-16, July.

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