Optimization of the Calcium Alginate Capsules for Self-Healing Asphalt
| Autor: | Amir Tabakovic, Erik Schlangen, D. Palin, Xueyan Liu, Shi Xu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Thermogravimetric analysis
Materials science Calcium alginate capsules Other Civil and Environmental Engineering 0211 other engineering and technologies rejuvenation Transportation Engineering 02 engineering and technology Civil Engineering lcsh:Technology law.invention lcsh:Chemistry chemistry.chemical_compound Optical microscope law 021105 building & construction alginate General Materials Science Thermal stability Composite material Instrumentation Environmental scanning electron microscope lcsh:QH301-705.5 Fluid Flow and Transfer Processes lcsh:T Process Chemistry and Technology Other Materials Science and Engineering General Engineering 021001 nanoscience & nanotechnology Microstructure lcsh:QC1-999 Computer Science Applications asphalt Compressive strength chemistry lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 Mortar 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:Physics |
| Zdroj: | Applied Sciences, Vol 9, Iss 3, p 468 (2019) Applied Sciences, 9(3) Applied Sciences Volume 9 Issue 3 Articles |
| ISSN: | 2076-3417 |
| Popis: | It has been demonstrated that calcium alginate capsules can be used as an asphalt healing system by pre-placing rejuvenator (healing agent) into the asphalt mix and releasing the rejuvenator on demand (upon cracking). This healing mechanism relies on the properties of capsules which are determined by the capsule preparation process. In this study, to optimize the calcium alginate capsules, capsules are prepared using varying Alginate/Rejuvenator (A/R) ratios. Light microscope microscopy and Environmental Scanning Electron Microscope (ESEM) are employed to characterize the morphology and microstructure of these capsules. Thermal stability and mechanical property are investigated by thermogravimetric analysis (TGA) and compressive tests. The testing results indicate that higher alginate content results in smaller diameter and lower thermal resistance, but higher compressive strength. The optimum A/R ratio of calcium alginate capsules is found to be 30/70. To prove the effectiveness of the optimized capsules, the capsules are embedded in asphalt mortar beams and a bending and healing program is carried out. The effect of capsule shell material on the mechanical response of asphalt mixture is evaluated through three-point bending on the mortar beams embedded with blank capsules (without the healing agent). Aged mortar beams containing alginate capsules encapsulating rejuvenator demonstrate a higher strength recovery after bending tests, which indicates effective healing due to the release of the rejuvenators from the capsules. |
| Databáze: | OpenAIRE |
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