Setting Time and Strength Monitoring of Alkali-Activated Cement Mixtures by Ultrasonic Testing
| Autor: | Ludwig Hertwig, Klaus Holschemacher, Biruk Hailu Tekle |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Taguchi design 0211 other engineering and technologies Sodium silicate 02 engineering and technology lcsh:Technology Article law.invention setting time chemistry.chemical_compound Flexural strength law 021105 building & construction General Materials Science Composite material lcsh:Microscopy geopolymer lcsh:QC120-168.85 Cement Vicat softening point lcsh:QH201-278.5 lcsh:T Ultrasonic testing 021001 nanoscience & nanotechnology compressive strength Portland cement Compressive strength chemistry lcsh:TA1-2040 lcsh:Descriptive and experimental mechanics Ultrasonic sensor lcsh:Electrical engineering. Electronics. Nuclear engineering ultrasonic testing lcsh:Engineering (General). Civil engineering (General) 0210 nano-technology lcsh:TK1-9971 alkali-activated cement |
| Zdroj: | Materials Volume 14 Issue 8 Materials, Vol 14, Iss 1889, p 1889 (2021) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma14081889 |
| Popis: | Alkali-activated cement (AAC) is a promising binder that replaces ordinary Portland cement (OPC). In this study, the development of setting time and strength of AAC mixes were studied using ultrasonic testing method. The test results were compared with traditional Vicat setting time and compressive and flexural strengths. The findings showed that setting times and strengths have a strong correlation with ultrasonic velocity curve. The initial setting time corresponds well with the ultrasonic velocity curve’s dormant period, and the final setting time with the time it takes to reach the velocity curve’s maximum acceleration. Both setting times also showed a correlation with the value of the maximum acceleration. An exponential relation was found between the ultrasonic velocity and the compressive and flexural strengths. The effect of binder content, alkaline solid to binder ratio (AS/B), sodium silicate to sodium hydroxide solids ratio (SS/SH), and total water to total solid binder ratio (TW/TS) on the strength and setting time are also studied using Taguchi method of experimental design. AS/B ratio showed a significant influence on the setting time of AAC while TW/TS ratio showed only a minor effect. The ultrasonic velocities were able to capture the effect of the different parameters similar to the compressive strength. The velocity decreased mainly with the increase of TW/TS ratio and binder content, while AS/B and SS/SH ratios showed a lower influence. |
| Databáze: | OpenAIRE |
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