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Influence of Interfacial Transition Zone on Local and Overall Fracture Response of Cementitious Composites
- Source :
- Key Engineering Materials. 784:97-102
- Publication Year :
- 2018
- Publisher :
- Trans Tech Publications, Ltd., 2018.
-
Abstract
- Mechanical fracture properties of interfacial transition zone (ITZ) of fine-grained composite based on cement matrix with different types – basalt, granite, marble and amphibolite – of rock inclusion were studied. Specimens with the initial stress concentrator were tested in standard three-point bending configuration. Fracture surfaces were examined with light and electron microscopes. Local ITZ response was characterized by nanoindentation in the vicinity of rock inclusions. Local elasticity, hardness and viscous properties were assessed. It has been shown that the ITZ is mechanically weaker compared to the bulk matrix in the region of ca. 0–20 μm from the inclusion for all specimen’s types. It exhibits gradual increase of elastic modulus and hardness, which can be approximately expressed by a power law. On the other hand, the creep in ITZ was found to be higher compared to the bulk matrix. The results of nanoindentation measurements are in a good agreement with overall mechanical properties, fracture response and microstructure measurements done by scanning electron microscopy.
- Subjects :
- Materials science
Mechanical Engineering
0211 other engineering and technologies
02 engineering and technology
Cementitious composite
Nanoindentation
021001 nanoscience & nanotechnology
Microstructure
Mechanics of Materials
021105 building & construction
Transition zone
Fracture (geology)
General Materials Science
Composite material
0210 nano-technology
Subjects
Details
- ISSN :
- 16629795
- Volume :
- 784
- Database :
- OpenAIRE
- Journal :
- Key Engineering Materials
- Accession number :
- edsair.doi...........eff8ed9f83596ca90ce715c25ad7b67d