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Experimental Investigation of Fracture Behavior and Mechanical Characteristics of Rammed Earth Materials

Hosseini, Mohammad Sajad | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50371 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Toufigh, Vahab
  7. Abstract:
  8. Rammed earth (RE) structures are getting popular due to sustainability, environmental-friendly and economic advantages. Various studies have investigated the mechanical behavior and the energy performance of RE materials. However, little is known about the fracture behavior of RE materials. In this research, the fracture properties of RE materials containing different percentages of various stabilizers were investigated using a modified wedge splitting test. The stabilizers were cement, pozzolan, microsilica, glass-fiber, guar-gum and phase change material. In addition, the effect of stabilizers on the microstructure and the phase composition was inspected using scanning electron microscope and X-ray powder diffraction, respectively. The results indicated that various stabilizers influence the crack resistance and the mechanical properties of RE materials differently. In particular, cement and pozzolan, depending on the pozzolanic reaction increased the strength of the microstructure while glass-fibers led to internal confinement and high ductility, that increased the fracture energy of RE materials. The statistically significant correlation indicated that increasing the tensile and the compressive strength and ultrasonic pulse velocity of the specimens could increase the specific fracture energy. Hence, the proper amount of each type of stabilizer could be determined for further crack resistance
  9. Keywords:
  10. Fracture Energy ; Phase Change Material (PCMs) ; Pozzolanic Activity ; Stabilized Rammed Earth ; Unstabilized Rammed Earth ; Guar Gum ; Wedge Splitting Test ; Ultrasonic Pulse Velocity

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