TY - JOUR
T1 - Study of the mechanical properties and self-healing ability of asphalt mixture containing calcium-alginate capsules
AU - Micaelo, R.
AU - Al-Mansoori, T.
AU - Garcia, Alvaro
N1 - Sem Pdf conforme despacho
The authors would like to acknowledge the financial support of the FCT – Fundação para a Ciência e a Tecnologia , IP, through grant SFRH/BSAB/113646/2015 financed by the Portuguese Government budget, the Higher Committee of Education Development in Iraq for the PhD scholarship of the second author, and the EPSRC project EP/M014134/1, Induction heating for closing cracks in asphalt concrete
PY - 2016/10/1
Y1 - 2016/10/1
N2 - The natural self-healing ability of asphalt mixtures can be enhanced with encapsulated rejuvenators: when crack damage appears the capsules release healing agents, which dissolve bitumen and drain into the cracks. In this study, the effect of a new type of capsules in the mechanical properties and the self-healing ability of asphalt mixtures is investigated. Sunflower oil was encapsulated in calcium-alginate, and protected with a hard shell made of epoxy-cement composite. Results show that the hard shell was not required for these capsules to resist mixing and compaction procedures. Capsules deformed and broke with loading, releasing oil that diffused in the bitumen in less than 24 h. Healing of cracks in asphalt mixture led to an increase of stiffness. However, asphalt specimens with capsules had lower deformation resistance. Computer tomography scanning of specimens showed large reductions in cracks around the capsules, after resting 4 days at 20 °C.
AB - The natural self-healing ability of asphalt mixtures can be enhanced with encapsulated rejuvenators: when crack damage appears the capsules release healing agents, which dissolve bitumen and drain into the cracks. In this study, the effect of a new type of capsules in the mechanical properties and the self-healing ability of asphalt mixtures is investigated. Sunflower oil was encapsulated in calcium-alginate, and protected with a hard shell made of epoxy-cement composite. Results show that the hard shell was not required for these capsules to resist mixing and compaction procedures. Capsules deformed and broke with loading, releasing oil that diffused in the bitumen in less than 24 h. Healing of cracks in asphalt mixture led to an increase of stiffness. However, asphalt specimens with capsules had lower deformation resistance. Computer tomography scanning of specimens showed large reductions in cracks around the capsules, after resting 4 days at 20 °C.
KW - Mechanical testing
KW - Rejuvenators encapsulation
KW - Self-healing
UR - http://www.scopus.com/inward/record.url?scp=84978712528&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2016.07.095
DO - 10.1016/j.conbuildmat.2016.07.095
M3 - Article
AN - SCOPUS:84978712528
VL - 123
SP - 734
EP - 744
JO - Construction and Building Materials
JF - Construction and Building Materials
SN - 0950-0618
ER -