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http://dx.doi.org/10.14190/JRCR.2020.8.4.537

A Study on the Mechanical Properties of Interfacial Transition Zone (ITZ) of Lightweight High Strength Concrete Via Nanoindentation  

Im, Su-Min (Department of Architectural Engineering, Hanyang University)
Bae, Sung-Chul (Department of Architectural Engineering, Hanyang University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.8, no.4, 2020 , pp. 537-544 More about this Journal
Abstract
The interfacial transition zone(ITZ) which is the boundary layer between cement composites and aggregates is considered to be the region of gradual transition, heterogeneous, and the weakest part of concrete. For the development of lightweight high strength concrete, it is essential to evaluate the mechanical properties of ITZ between high strength concrete with low water-binder ratio and lightweight aggregates. However, the mechanical properties of ITZ are not well established due to its high porosity and complex structure. Furthermore, the properties of ITZ in concrete using lightweight aggregates are dominated by more various variations (e.g. water-binder ratio, water absorption capacity of aggregate, curing conditions) than normal-weight aggregate concrete. This study aims to elucidate the mechanical properties of ITZ in lightweight high-strength cement composites according to the types of aggregates and the aggregate sizes. Nanoindentation analysis was used to evaluate the elastic modulus of ITZ between high strength cement composites with the water-binder ratio of 0.2 and normal sand, lightweight aggregate with different aggregate siz es of 2mm and 5mm in this study.
Keywords
Lightweight aggregate; Interfacial transition zone(ITZ); Nanoindentation; High strength concrete;
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