Strain sensitivity of steel-fiber-reinforced industrial smart concrete

Demircilioglu E., Teomete E., Ozbulut O. E.

JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES, cilt.31, sa.1, ss.127-136, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 31 Sayı: 1
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1177/1045389x19888722
  • Dergi Adı: JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Aerospace Database, Applied Science & Technology Source, Business Source Elite, Business Source Premier, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.127-136
  • Anahtar Kelimeler: Self sensing, piezoresistivity, electrical resistance, strain, smart concrete, smart material, structural health monitoring, CARBON NANOFIBERS/EPOXY COMPOSITES, CEMENTITIOUS COMPOSITES, DAMAGE, RESISTIVITY, MECHANISMS, NANOTUBE, BLACK
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

Self-sensing cementitious composites can enable structures that are capable of carrying the loads applied on them while monitoring their condition. Most of earlier research has focused on the incorporation of nanofillers or microfibers into cement paste or mortar composites. However, there have been very limited number of studies on the development of steel-fiber-reinforced cementitious composites with self-sensing capabilities. This study explores strain sensitivity of concrete mixtures that include coarse aggregates up to 15 mm diameter and steel fibers with a length of 13 mm and a diameter of 0.25 mm. Five different concrete mixtures with steel fibers at 0%, 0.2%, 0.35%, 0.5%, and 0.8% volume ratios were fabricated. Compression tests with simultaneous measurement of strain and electrical resistance were conducted on the cubic specimens. Gauge factor and percent linearity that is a measure of error in strain sensing were calculated. Concrete mixtures with 0.5% steel fibers possess a strong linear relationship between applied strain and electrical resistance change with a gauge factor over 20 times larger than that of traditional metal strain gauges. Phenomenological models for different resistivity and gauge factors of cement paste/mortar with respect to concrete with large aggregates and short-long fiber cement composites were presented.