Elucidation of the Hydration Reaction of UHPC Using the PONKCS Method
| Autor: | Juhyuk Moon, Nankyoung Lee, Hyunuk Kang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Thermogravimetric analysis
Materials science Silica fume 0211 other engineering and technologies 02 engineering and technology thermogravimetry lcsh:Technology Article chemistry.chemical_compound hydration reaction 021105 building & construction Hydration reaction General Materials Science calcium silicate hydrate Calcium silicate hydrate lcsh:Microscopy lcsh:QC120-168.85 Cement ultra-high-performance concrete lcsh:QH201-278.5 lcsh:T 021001 nanoscience & nanotechnology Amorphous solid X-ray diffraction nuclear magnetic resonance Compressive strength chemistry Chemical engineering lcsh:TA1-2040 Pozzolanic reaction lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 |
| Zdroj: | Materials, Vol 13, Iss 4661, p 4661 (2020) Materials Volume 13 Issue 20 |
| ISSN: | 1996-1944 |
| Popis: | This study explored the hydration reaction of ultra-high-performance concrete (UHPC) by using X-ray diffraction (XRD), nuclear magnetic resonance (NMR), and thermogravimetric analysis (TGA) as analysis methods. The partial- or no-known crystal structure (PONKCS) method was adopted to quantify the two main amorphous phases of silica fume and C-S-H such quantification is critical for understanding the hydration reaction of UHPC. The measured compressive strength was explained well by the degree of hydration found by the PONKCS method, particularly the amount of amorphous C-S-H. During heat treatment, the pozzolanic reaction was more intensified by efficiently consuming silica fume. After heat treatment, weak but continuous hydration was observed, in which the cement hydration reaction was dominant. Furthermore, the study discussed some limitations of using the PONKCS method for studying the complicated hydration assemblage of UHPC based on the results of TGA and NMR. Generally, the PONKCS method underestimated the content of silica fume in the early age of heat treatment. Furthermore, the structural evolution of C-S-H, confirmed by NMR, should be considered for more accurate quantification of C-S-H formed in UHPC. Nevertheless, PONKCS-based XRD could be useful for understanding and optimizing the material properties of UHPC undergoing heat treatment. |
| Databáze: | OpenAIRE |
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