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Tielin Han,Xianfeng Wang,Dawang Li,Ningxu Han,Dongfeng Li,Feng Xing 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.S1
The effects of different dosages of microcapsules, proportion of prepressing stress and curing days on the mechanicalproperties, pore structure and healing efficiency of the specimens were studied through uniaxial compression test and mercuryintrusion porosimetry (MIP) test. The results indicate that the uniaxial strength of the specimens decreased to a certain extentwith an increase of dosage of the microcapsules. Meanwhile, the pore structure parameters (pore volume; porosity; criticalpore size; capillary porosity), as well as the self-healing rate and recovery rate of the mechanical properties increased withincreasing the dosage of microcapsules. The microcapsules have a significant influence on the deformation characteristics ofthe specimens and may improve the brittleness characteristics and strengthen the ductility of the ordinary concrete.
Effect of lead sulfate on chloride ion transport properties in cementitious material
Xianfeng Wang,Yabin Yuan,Yingxin Huang,Tielin Han,Weilun Wang,Jian Liu,Feng Xing 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.S1
A novel microcapsule-based self-healing system was developed in Guangdong Key Laboratory of Durability in Coastal CivilEngineering to prolong the concrete service life, in which lead sulfate is used as the shell material of the microcapsules. Theself-healing system is triggered by the reaction of lead sulfate with chloride ion. In this study, the effect of lead sulfate onchloride ion transport in cement-based materials was investigated. The bulk diffusion and rapid chloride migration tests werecarried out. The time dependence of chloride diffusion was analysed based on the results of the Bulk diffusion test. The changein the microstructure of cement-based materials upon incorporation of lead sulfate was observed and analysed via mercuryintrusion porosimetry and scanning electron microscopy. Results showed that chloride-binding was prevalent at an immersionperiod of less than 90 days, while sulfate attack superseded after 90 days. Therefore, the impact of both factors needs to beconsidered when utilizing lead sulfate as a shell material in cementitious materials.