Nano-modification to improve the ductility of cementitious composites

Journal Article · Thu Oct 15 00:00:00 EDT 2015 · Cement and Concrete Research

DOI:https://doi.org/10.1016/J.CEMCONRES.2015.05.026· OSTI ID:22475527

Yeşilmen, Seda ^[1]; Al-Najjar, Yazin ^[2]; Balav, Mohammad Hatam ^[3]; Şahmaran, Mustafa ^[3]; Yıldırım, Gürkan ^[3]; Lachemi, Mohamed ^[4]

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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)

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.

• OSTI ID: 22475527
• Journal Information: Cement and Concrete Research, Vol. 76; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

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