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Carbon nanotube reinforced alkali-activated slag mortars
- Source :
- Construction and Building Materials. 119:223-229
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- The paper reports on a study of the effect of multi-walled carbon nanotubes (MWCNTs) when used as dispersed reinforcement on the fracture properties and microstructure of alkali-activated slag mortars. The amount of MWCNTs added varied in the range of 0.05–1.0% of the mass of slag. Mechanical and fracture properties were determined using fracture tests carried out on 40 × 40 × 160 mm specimens with a central notch. The observed parameters were compressive strength, modulus of elasticity, effective fracture toughness and specific fracture energy. Specimen response during fracture tests was also monitored by means of acoustic emission, and this method was also used for the determination of cracking tendency due to autogenous and drying shrinkage occurring during the hardening process. It is shown that the addition of up to 0.2% of MWCNTs improves the fracture properties of alkali-activated slag. Although a higher dosage of MWCNTs reduced the number of microcracks observed by acoustic emission, the mechanical properties of the slag deteriorated due to the less effective dispersion of the MWCNTs and the formation of bundles.
- Subjects :
- Materials science
Metallurgy
0211 other engineering and technologies
Fracture mechanics
Young's modulus
02 engineering and technology
Building and Construction
021001 nanoscience & nanotechnology
Microstructure
symbols.namesake
Fracture toughness
Compressive strength
Acoustic emission
021105 building & construction
Hardening (metallurgy)
symbols
General Materials Science
Composite material
0210 nano-technology
Civil and Structural Engineering
Shrinkage
Subjects
Details
- ISSN :
- 09500618
- Volume :
- 119
- Database :
- OpenAIRE
- Journal :
- Construction and Building Materials
- Accession number :
- edsair.doi...........ad0f8387c410ec52c401400d61600614