Nano-modification to improve the ductility of cementitious composites

Effect of nano-sized mineral additions on ductility of engineered cementitious composites (ECC) containing high volumes of fly ash was investigated at different hydration degrees. Various properties of ECC mixtures with different mineral additions were compared in terms of microstructural properties of matrix, fiber-matrix interface, and fiber surface to assess improvements in ductility. Microstructural characterization was made by measuring pore size distributions through mercury intrusion porosimetry (MIP). Hydration characteristics were assessed using thermogravimetric analysis/differential thermal analysis (TGA/DTA), and fiber-matrix interface and fiber surface characteristics were assessed using scanning electron microscopy (SEM) through a period of 90 days. Moreover, compressive and flexural strength developments were monitored for the same period. Test results confirmed that mineral additions could significantly improve both flexural strength and ductility of ECC, especially at early ages. Cheaper Nano-CaCO₃ was more effective compared to nano-silica. However, the crystal structure of CaCO₃ played a very important role in the range of expected improvements.

• Record URL:
  https://doi.org/10.1016/j.cemconres.2015.05.026
• Record URL:
  http://www.sciencedirect.com/science/article/pii/S0008884615001696
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00088846
• Supplemental Notes:
  • Abstract reprinted with permission from Elsevier.
• Authors:
  • Yesilmen, Seda
  • Al-Najjar, Yazin
  • Balav, Mohammad Hatam
  • Sahmaran, Mustafa
  • Yildirim, Gürkan
  • Lachemi, Mohamed
• Publication Date: 2015-10

Language

• English

Media Info

• Media Type: Web
• Features: Figures; References; Tables;
• Pagination: pp 170-179
• Serial:
  • Cement and Concrete Research
  • Volume: 76
  • Publisher: Elsevier
  • ISSN: 0008-8846
  • Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

• TRT Terms: Compressive strength; Ductility; Flexural strength; Fly ash; Hydration; Microstructure; Pore size distribution
• Uncontrolled Terms: Cement composites; Nano-calcium carbonate; Nanosilica
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01573686
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 30 2015 12:54PM