Zhihui Sun

TL;DR: In this paper, 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.

TL;DR: The authors used finite element procedures combined with knowledge of individual phase moduli, in combination with a cement paste microstructure development model, to predict elastic moduli as a function of degree of hydration, as measured by loss on ignition.

TL;DR: In this article, the effect of different mixing approaches on the properties of ITZs in Recycled Aggregate Concrete (RAC) was investigated, and it was shown that two-stage mixing approach can improve the nanomechanical properties of the new ITZ by reducing the volume fraction of voids and Calcium Hydroxide (CH).

TL;DR: In this paper, the effects of nano-silica/SiO 2 (NS) and nano-limestone/CaCO 3 (NC) on the flowability, strengths and microstructure of ultra-high-performance concrete (UHPC) matrix under different curing conditions were investigated.

TL;DR: In this paper, the Young's modulus, strength, and peak strain of recycled concrete under both compressive and tensile loading were experimentally studied to understand its failure mechanism, and it was found that some mechanical properties of the recycled concrete are similar to those of mortar, for instance, lower Young's model, higher peak strain and more brittleness, due to a larger volume content of both new and old hardened mortar.