Influence of cement type on ITZ porosity and chloride resistance of self-compacting concrete |
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| Authors: | Andreas Leemann Roman Loser Beat Münch |
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| Affiliation: | 1. Key Laboratory of Advanced Civil Engineering Materials Ministry of Education, Tongji University, Shanghai 201804, China;2. School of Material Sciences and Engineering, Tongji University, Shanghai 201804, China;1. Civil Engineering Department, Universiti Teknologi PETRONAS, Malaysia;2. Civil and Urban Engineering Department, Institute of Technology, Haramaya University, Dire Dawa, Ethiopia |
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| Abstract: | With the increasing use of self-compacting concrete (SCC) its durability has come into focus. Concerning the microstructure of concrete, the porosity in the interfacial transition zone (ITZ) is regarded as a key feature for permeability and durability. Generally, a combination of cement and mineral admixtures is used for the production of SCC. In the present study, ITZ porosity of four SCC mixtures produced with ordinary Portland cement, Portland limestone cement, slag cement and ordinary Portland cement combined with fly ash is analyzed. Additionally, the chloride migration coefficient is determined. ITZ porosity and width of the SCC mixtures are similar. The substantial differences in the chloride migration coefficients show that the binder type has a stronger influence on permeability than the pore volume in the ITZ. |
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