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Abstract:
The application of self-healing property to cement-based materials promoted a long-term service time in engineering. In this study, dimethyl thio-toluene diamine (DMTDA) microcapsules were synthesized successfully through melting-dispersion-condensation techniques, and enabled crack closure thus recovering the mechanical property. The as-fabricated DMTDA microcapsules showed a core-shell structure and well-dispersed properties with a tailorable core fraction and diameter, (e.g., a diameter of 312.7 +/- 97.6 mu m and a shell thickness of 15.2 +/- 2.6 mu m under agitation rate of 300 RPM). It was found that DMTDA microcapsules had a high core fraction and good thermal stability. The introduction of microcapsules decreased the flowability of cement paste but remained integral structures during the mechanical agitation. The increase of microcapsule concentrations led to a significant drop in porosity but a slight decrease in compressive strength of cement paste. Most importantly, the addition of DMTDA microcapsules and isocyanates microcapsules in the cement paste could repair the early hydration cracks with a size less than 100 mu m, thereafter achieving a satisfying recovery of the compressive strength.
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CEMENT & CONCRETE COMPOSITES
ISSN: 0958-9465
Year: 2021
Volume: 122
1 0 . 5 0 0
JCR@2022
ESI Discipline: MATERIALS SCIENCE;
ESI HC Threshold:116
JCR Journal Grade:1
Cited Count:
WoS CC Cited Count: 27
SCOPUS Cited Count: 30
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 7
Affiliated Colleges: