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Mechanical behavior and phase change of alkali-silica reaction products under hydrostatic compression
- Source :
- Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials
- Publication Year :
- 2019
-
Abstract
- Alkali-silica reaction (ASR) causes severe degradation of concrete. The mechanical property of the ASR product is fundamental to the multiscale modeling of concrete behavior over the long term. Despite years of study, there is a lack of consensus regarding the structure and elastic modulus of the ASR product. Here, ASR products from both degraded field infrastructures and laboratory synthesis were investigated using high-pressure X-ray diffraction. The results unveiled the multiphase and metastable nature of ASR products from the field. The dominant phase undergoes permanent phase change via collapsing of the interlayer region and in-planar glide of the main layer, under pressure >2 GPa. The bulk moduli of the low- and high-pressure polymorphs are 27±3 and 46±3 GPa, respectively. The laboratory-synthesized sample and the minor phase in the field samples undergo no changes of phase during compression. Their bulk moduli are 35±2 and 76±4 GPa, respectively. The results provide the first atomistic-scale measurement of the mechanical property of crystalline ASR products.
- Subjects :
- Diffraction
Chemistry
0211 other engineering and technologies
Metals and Alloys
02 engineering and technology
021001 nanoscience & nanotechnology
Compression (physics)
Multiscale modeling
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
Phase (matter)
Metastability
021105 building & construction
Materials Chemistry
Alkali–silica reaction
Degradation (geology)
Composite material
0210 nano-technology
Elastic modulus
Subjects
Details
- ISSN :
- 20525206
- Volume :
- 76
- Issue :
- Pt 4
- Database :
- OpenAIRE
- Journal :
- Acta crystallographica Section B, Structural science, crystal engineering and materials
- Accession number :
- edsair.doi.dedup.....c0cf3982f8a7c17783afcaa06dd64485