There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

The American Society for Testing and Materials (ASTM) is an independent organization devoted to the development of standards.

American Society for Testing and Materials

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Properties Of Concrete

Human Development Report 2007/2008: fighting climate change: human solidarity in a divided world

Utilization and efficiency of ground granulated blast furnace slag on concrete properties – A review

Evaluation of the bond properties between concrete and reinforcement as a function of the degree of reinforcement corrosion

Modeling the hydration of concrete incorporating fly ash or slag

This study was carried out to investigate quantitatively the relationship between the degree of reinforcement corrosion and the mechanical properties of reinforcement. In the experiment, the tensile test of corroded reinforcement was conducted at different stage of reinforcement corrosion. As a result, it was found that the chloride-induced corrosion caused the pitting and the corrosion using electrical current caused the uniformed corrosion. As the degree of reinforcement corrosion increased, the nominal yield point and nominal elastic modulus decreased. Also, there were very high correlations between the degree of reinforcement corrosion and the mechanical properties of reinforcement. We could make the material constitutive laws for the mechanical properties of reinforcement as a function of the degree of corrosion. Also, it is possible to analyze the strength of damaged RC members with reinforcement corrosion using constitutive laws of reinforcement by the FEM.

Han-Seung Lee

Papers

Evaluation of the bond properties between concrete and reinforcement as a function of the degree of reinforcement corrosion

Modeling the hydration of concrete incorporating fly ash or slag

Evaluation of the mechanical properties of steel reinforcement embedded in concrete specimen as a function of the degree of reinforcement corrosion

Optimum concentration of Bacillus megaterium for strengthening structural concrete

An experimental study on the retrofitting effects of reinforced concrete columns damaged by rebar corrosion strengthened with carbon fiber sheets