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Impact of sulfate attack on mechanical properties and hydraulic conductivity of a cement-admixed clay

(2014) APPLIED CLAY SCIENCE. 101. p.490-496
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Abstract
Methodology: The mechanical and hydraulic behaviors of a cement-treated clay in contact with water and an ag- gressive sodium sulfate solution were investigated. Bender elements were installed in a flexible-wall hydraulic conductivity cell to simultaneously monitor the small-strain shear modulus (G0) and the hydraulic conductivity (k) of the cement-admixed clay. Results: During permeation with clean water, an increase of G0 and a gradual decrease of k with time were ob- served due to cement hydration. Conversely, after permeation with the sulfate solution, a sudden decrease of G0 and a gradual increase of k were recorded. Conclusions: G0 measurements provided evidence of immediate deterioration of the sample as it comes in contact with sulfates. However, in order to have significant impact on the permeability, a network of interconnected pref- erential flow paths had to first develop through the whole sample. Monitoring of G0 was shown to provide valu- able additional information to study the impact of chemical degradation of cement-treated clays.
Keywords
SOILS, STIFFNESS, ETTRINGITE FORMATION, BENDER ELEMENT TESTS, BEHAVIOR, STRENGTH, LIME, Clay, Cement, Sulfate attack, Hydraulic conductivity, Stiffness

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Citation

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Chicago
Verastegui Flores, Ramiro, and Gemmina Di Emidio. 2014. “Impact of Sulfate Attack on Mechanical Properties and Hydraulic Conductivity of a Cement-admixed Clay.” Ed. Faiza Bergaya. Applied Clay Science 101: 490–496.
APA
Verastegui Flores, R., & Di Emidio, G. (2014). Impact of sulfate attack on mechanical properties and hydraulic conductivity of a cement-admixed clay. (F. Bergaya, Ed.)APPLIED CLAY SCIENCE, 101, 490–496.
Vancouver
1.
Verastegui Flores R, Di Emidio G. Impact of sulfate attack on mechanical properties and hydraulic conductivity of a cement-admixed clay. Bergaya F, editor. APPLIED CLAY SCIENCE. Elsevier; 2014;101:490–6.
MLA
Verastegui Flores, Ramiro, and Gemmina Di Emidio. “Impact of Sulfate Attack on Mechanical Properties and Hydraulic Conductivity of a Cement-admixed Clay.” Ed. Faiza Bergaya. APPLIED CLAY SCIENCE 101 (2014): 490–496. Print.
@article{5870785,
  abstract     = {Methodology: The mechanical and hydraulic behaviors of a cement-treated clay in contact with water and an ag- gressive sodium sulfate solution were investigated. Bender elements were installed in a flexible-wall hydraulic conductivity cell to simultaneously monitor the small-strain shear modulus (G0) and the hydraulic conductivity (k) of the cement-admixed clay.
Results: During permeation with clean water, an increase of G0 and a gradual decrease of k with time were ob- served due to cement hydration. Conversely, after permeation with the sulfate solution, a sudden decrease of G0 and a gradual increase of k were recorded.
Conclusions: G0 measurements provided evidence of immediate deterioration of the sample as it comes in contact with sulfates. However, in order to have significant impact on the permeability, a network of interconnected pref- erential flow paths had to first develop through the whole sample. Monitoring of G0 was shown to provide valu- able additional information to study the impact of chemical degradation of cement-treated clays.},
  author       = {Verastegui Flores, Ramiro and Di Emidio, Gemmina},
  editor       = {Bergaya, Faiza},
  issn         = {0169-1317},
  journal      = {APPLIED CLAY SCIENCE},
  keywords     = {SOILS,STIFFNESS,ETTRINGITE FORMATION,BENDER ELEMENT TESTS,BEHAVIOR,STRENGTH,LIME,Clay,Cement,Sulfate attack,Hydraulic conductivity,Stiffness},
  language     = {eng},
  pages        = {490--496},
  publisher    = {Elsevier},
  title        = {Impact of sulfate attack on mechanical properties and hydraulic conductivity of a cement-admixed clay},
  url          = {http://dx.doi.org/10.1016/j.clay.2014.09.012},
  volume       = {101},
  year         = {2014},
}

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