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

Recycled aggregate from C&D waste & its use in concrete – A breakthrough towards sustainability in construction sector: A review

An overview of study on recycled aggregate concrete in China (1996-2011)

Effects of elevated temperatures on properties of concrete

Construction and demolition waste generation and properties of recycled aggregate concrete: A global perspective

Mechanical Properties of Recycled Aggregate Concrete Under Uniaxial Loading

Use of sea-sand and seawater in concrete construction: Current status and future opportunities

The properties of new Interfacial Transition Zone (ITZ) and old ITZ in Recycled Aggregate Concrete (RAC) were investigated by Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM) and nanoindentation. From the SEM images, obvious voids and high concentration of calcium hydroxide can be found in both old ITZ and new ITZ in RAC. Based on the nanoindentation study, it is indicated that the thicknesses of old and new ITZs are in the range 40–50 μm and in the range 55–65 μm, respectively. It is also found that the average indentation modulus of old ITZ is 70–80% of that of old paste matrix, while the average indentation modulus of new ITZ is 80–90% of that of new paste matrix. Additionally, the influences of mix proportion, aggregate types and hydration age on the properties of ITZs in RAC are discussed in this study.

Jianzhuang Xiao

Papers

Mechanical Properties of Recycled Aggregate Concrete Under Uniaxial Loading

An overview of study on recycled aggregate concrete in China (1996-2011)

Use of sea-sand and seawater in concrete construction: Current status and future opportunities

Properties of interfacial transition zones in recycled aggregate concrete tested by nanoindentation

Bond behaviour between recycled aggregate concrete and steel rebars