Transport Properties of Engineered Cementitious Composites Under Chloride Exposure

The authors present experimental investigation results on engineered cementitious composites' (ECCs') chloride transport properties under combined environmental and mechanical loads. A newly developed, high performance, fiber-reinforced cementitious composite, ECC is substantially beneficial, due to tight crack width, in terms of both improved durability and ductility. Under uniaxial tensile loading, maximum ductility in excess of 3% can be attained with only 2% fiber content by volume through use of micromechanics-based material design, and commonly observed typical single crack fracture behavior in normal mortar or concrete converted, in ECC, in multiple microcracking. To determine chloride ion transport properties in this study, immersion and salt ponding tests were conducted. Microcracks less than 50 µm and an effective diffusion coefficient significantly lower than reinforced mortar beam, similarly preloaded because of ECC's tight crack width control, were revealed in preloaded ECC beam specimens under high imposed bending deformation. Under the same imposed deformation, there is easy production of cracks larger than 150 µm, in contrast, and they significantly effect reinforced mortar diffusion coefficient. Through microcrack formation, moreover, within the ECC cracks subjected to NaCl solution, significant self-healing was observed

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/13846872
• Authors:
  • Sahmaran, Mustafa
  • Li, Mo
  • Li, Victor C
• Publication Date: 2007

Language

• English

Media Info

• Media Type: Print
• Features: Figures; Photos; References; Tables;
• Pagination: pp 604-611
• Serial:
  • ACI Materials Journal
  • Volume: 104
  • Issue Number: 6
  • Publisher: American Concrete Institute (ACI)
  • ISSN: 0889-325X
  • Serial URL: https://www.concrete.org/publications/acimaterialsjournal.aspx

Subject/Index Terms

• TRT Terms: Beams; Cement; Chlorides; Cracking; Deformation; Design; Ductility; Durability; Mechanical loads; Microcracking; Tension; Transport properties (Physics)
• Uncontrolled Terms: Chloride exposure; Crack width; Environmental loads; Micromechanics; Preloading; Self healing cracks; Uniaxial
• Subject Areas: Design; Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01082638
• Record Type: Publication
• Report/Paper Numbers: 104-M66
• Files: TRIS
• Created Date: Dec 18 2007 11:30AM