skip to main content

Title: 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-CaCO{sub 3} was more effective compared to nano-silica. However, the crystal structure of CaCO{sub 3} played a very important role in the range of expected improvements.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [4]
  1. Department of Civil Engineering, Çankaya University, Ankara (Turkey)
  2. Department of Civil Engineering, Gaziantep University, Gaziantep (Turkey)
  3. Department of Civil Engineering, Gazi University, Ankara (Turkey)
  4. Department of Civil Engineering, Ryerson University, Toronto, ON (Canada)
Publication Date:
OSTI Identifier:
22475527
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 76; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALCIUM CARBONATES; COMPARATIVE EVALUATIONS; COMPOSITE MATERIALS; CRYSTAL STRUCTURE; DIFFERENTIAL THERMAL ANALYSIS; DUCTILITY; FIBERS; FLEXURAL STRENGTH; FLY ASH; INTERFACES; MERCURY; MICROSTRUCTURE; MIXTURES; NANOSTRUCTURES; PLUTONIC ROCKS; SCANNING ELECTRON MICROSCOPY; SILICA; SURFACES; THERMAL GRAVIMETRIC ANALYSIS; WATER INFLUX