Carbon nanotube reinforced cementitious tailings composites: Links to mechanical and microstructural characteristics

Zhang H., Cao S., Yılmaz E.

CONSTRUCTION AND BUILDING MATERIALS, cilt.365, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 365
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1016/j.conbuildmat.2022.130123
  • Dergi Adı: CONSTRUCTION AND BUILDING MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, CAB Abstracts, Communication Abstracts, INSPEC, Metadex, Veterinary Science Database, Civil Engineering Abstracts
  • Anahtar Kelimeler: Carbon nanotubes, Cementitious backfills, Microstructure cracks, Mechanical properties, FLY-ASH, STRENGTH, DURABILITY, BACKFILL, WASTE
  • Recep Tayyip Erdoğan Üniversitesi Adresli: Evet

Özet

The special hexagonal structure of carbon nanotubes (CNTs) leads to bending, exhibiting a spatial topology. Thus it has excellent electrical, mechanical and thermal stability and other properties. To explore the effect of CNTs on cementitious tailings backfill (CTB)'s strength behavior, two types of CNTs: hydroxylated (CNTCOOH); ordinary multi-walled (CNTPL) were used in this study. CNTs with six different concentrations of 0% (control), 0.05%, 0.10%, 0.15%, 0.20%, and 0.25% were added to prepare CTB specimens, respectively. CTB's strength and microstructure were thoroughly studied by UCS (unconfined compressive strength) tests and SEM (scanning electron microscopy) observations. The leading inferences revealed that: the bridging effect of CNTs inhibited significantly the expansion of the cracks occurred within CTB specimens, representing good integrity after failure. Both CNTPL and CNTCOOH improve the UCS performance of the tested composites. However, CNTPL provided the best boosting effect on the mechanical properties of CTB. Although CNTCOOH-reinforced fills are not as superior in UCS as CNTPL-reinforced ones, CNTCOOH shows better ductility performance than others. To sum up, this study's key end is that it is viable to use the fractal properties of microstructure for better estimating the strength development of CTB specimens reinforced with diverse CNTs.