Unconfined compressive strength and freeze-thaw resistance of sand modified with sludge ash and polypropylene fiber


Gullu H., Fedakar H. İ.

GEOMECHANICS AND ENGINEERING, cilt.13, sa.1, ss.25-41, 2017 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 13 Sayı: 1
  • Basım Tarihi: 2017
  • Doi Numarası: 10.12989/gae.2017.13.1.025
  • Dergi Adı: GEOMECHANICS AND ENGINEERING
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.25-41
  • Anahtar Kelimeler: sludge ash, polypropylene fiber, sand, unconfined compressive strength, freezing and thawing resistance, soil stabilization, REINFORCED CEMENTED SAND, SOFT SUBGRADE SOIL, FLY-ASH, ENGINEERING PROPERTIES, CLAYEY SOIL, LIME, BEHAVIOR, MIXTURES, TENSILE, STABILIZATION
  • Abdullah Gül Üniversitesi Adresli: Evet

Özet

In recent years, the amount of sludge ash (SA) has considerably increased due to rapid urbanization and population growth. In addition, its storage in landfills induces environmental pollution and health problems. Therefore, its disposal in an environmentally friendly way has become more important. The main goal of this study is to investigate the reusability of sludge ash as an additive with polypropylene fiber (PF) to stabilize marginal sand based on the compressive strength performances from UCS tests. For this purpose, a series of UCS tests was conducted. Throughout the experimental study, the used inclusion rates were 10, 15, 20 and 30% for sludge ash and 0, 0.5 and 1% for polypropylene fiber by total dry weight of the sand+sludge ash mixture and the prepared samples were cured for 7 and 14 days prior to the testing. Freezing and thawing resistance of the mixture including 10% sludge ash and 0, 0.5 and 1% polypropylene fiber was also examined. On the basis of UCS testing results, it is said that sludge ash inclusion remarkably enhances UCS performance of sand. Moreover, the addition of polypropylene fiber to the admixtures including sand and sludge ash significantly improves their stress-strain characteristics and post-peak strength loss as well as UCS. As a result of this paper, it is suggested that sludge ash be successfully reused with polypropylene fiber for stabilizing sand in soil stabilization applications. It is also believed that the findings of this study will contribute to some environmental concerns such as the disposal problem of sludge ash, recycling, sustainability, environmental pollution, etc. as well as the cost of an engineering project.