This review briefly summarizes introductory understandings of concrete rheology and applications in which rheology plays an important role. A mixture of cement and water is the rheological material classified as dispersed systems involving chemical reactions, and it has been considered the most challenging research subject in the field of rheology. This review introduces the most crucial chemical admixture for fresh concrete controlling rheological properties (so-called superplasticizer) after summarizing the fundamental knowledge of concrete rheology. In addition, recent research trends on 3D printing using concrete, riddled with rheological challenges, are introduced.
For the purpose to study about the characteristics of the process of the corrosion-induced deterioration detected on surface of RC wall with mortar finish, RC wall specimens were electrified and measured the amount of the deteriorations as crack, delamination and spalling by hammer and visual examination periodically. From the results, in the case the cover thickness was small, the delamination increased with the progress of the rebar corrosion, which behavior were not liner but agogics. And in the case the cover thickness was large, the cracks along the rebar increased on mortar surface with the progress of the rebar corrosion.
The purpose of this study is to investigate the applicability of the VAR-X model to prediction of internal humidity of concrete exposed to ordinary natural environment. The parameters are estimated using internal humidity data and weather data. The results show that VAR-X model can be applied to non-rainfall environment data and that it can roughly reproduce the subsequent humidity fluctuation. Whereas, VAR-X model underestimates the impact of rainfall, and is not applicable to rainfall environment data. The applicability of VAR-X model is discussed based on the difference of humidity fluctuation mechanisms in concrete between rainfall and non-rainfall.
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