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On the Stability of Rammed Earth Exposed to the Natural Urban Climate

Gaffarian, Mahya | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 57579 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Toufigh, Vahab
  7. Abstract:
  8. In recent years, many engineers and researchers have identified one of their primary concerns as finding economically viable construction methods that promote sustainable development and are environmentally friendly. Compacted earth structures have recently gained attention among engineers and researchers due to the mentioned advantages. The discussion regarding their durability and acceptance as construction materials is crucial. A better understanding of compacted earth from a mechanical and structural perspective allows overcoming its disadvantages. Numerous studies have extensively investigated the durability of stabilized compacted earth materials through various experiments. To date, the topic of erosion of these materials and comparing different percentages of cement and high clay content in multiple climates, including open-air, moderate, and those inclined to cold-moist and dry conditions, has been minimally explored. This thesis investigates the durability of stabilized compacted earth materials with cement and clay in the environment of Mashhad, characterized by cold winters, warm summers, and dry conditions over nine months. Cement was used in three different percentages, and clay was used in three different rates for stabilizing compacted earth. Mechanical properties were explicitly measured after 1, 3, 6, and 9 months of exposure to these environments. The results indicated that, in comparing clay and cement samples, the cement sample with the highest percentage of cement tolerated higher strains. In contrast, the 65% clay sample endured a lower pressure. Clay and cement samples exhibited different performances in most mechanical indices, but the results showed similar versions regarding energy absorption, damping, and shrinkage hardness. Additionally, a relationship between ultrasonic wave velocity and compressive strength was established for all samples
  9. Keywords:
  10. Compacted Soil ; Compression Strength ; Elastisity Modulus ; Cemented Soil ; Ultrasonic Waves ; Stabilized Rammed Earth ; Clay Soils

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