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Long-term comparison between waste paper fly ash and traditional binder as hydraulic road binder exposed to sulfate concentrations

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Baloochi, HaniMés informació
Barra Bizinotto, MarildaMés informacióMés informacióMés informació
Aponte Hernández, Diego FernandoMés informacióMés informacióMés informació
Document typeArticle
Defense date2022-08
PublisherMultidisciplinary Digital Publishing Institute (MDPI)
Rights accessOpen Access
Attribution 4.0 International
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution 4.0 International
ProjectPAPERCHAIN - New market niches for the Pulp and Paper Industry waste based on circular economy approaches (EC-H2020-730305)
Abstract
Sulfate attack is one of the drawbacks of cementitious materials for stabilized soils. In the current study, a durability comparison of stabilized soil with cement (Type IV) and waste paper fly ash (WPFA) was conducted. First, the treated soil’s unconfined compressive strength (UCS) was tested. Next, the treated soil was subjected to various wetting/drying cycles with various sulfate concentrations and temperatures for a year. In the meantime, samples were taken for DRX, FTIR, and TGA microstructural analyses. Additionally, samples were manufactured to track swelling over an 800 day period. The outcomes show that WPFA’s UCS remained constant. Furthermore, ettringite development can be seen in the microstructural studies, however testing on linear displacement over 800 days revealed no significant changes in swelling. Finally, SEM was used to verify the ettringite formation at 360 days in order to confirm the previous findings. All the results indicated that stabilizing soil with 5% of WPFA and 3% of cement IV is possible even in presence of high sulfate concentrations, while maintaining the durability of the structure.
CitationBaloochi, H.; Barra, M.; Aponte, D.F. Long-term comparison between waste paper fly ash and traditional binder as hydraulic road binder exposed to sulfate concentrations. "Materials", Agost 2022, vol. 15, núm. 15, p. 5424:1-5424:23. 
URIhttp://hdl.handle.net/2117/372338
DOI10.3390/ma15155424
ISSN1996-1944
Publisher versionhttps://www.mdpi.com/1996-1944/15/15/5424
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  • Doctorat en Enginyeria de la Construcció - Articles de revista [104]
  • Departament d'Enginyeria Civil i Ambiental - Articles de revista [2.682]
  • MATCAR - Materials de construcció i carreteres - Articles de revista [88]
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