Chen, Rumeng and Mo, Kim Hung and Ling, Tung-Chai (2022) Offsetting strength loss in concrete via ITZ enhancement: From the perspective of utilizing new alternative aggregate. Cement & Concrete Composites, 127. ISSN 0958-9465, DOI https://doi.org/10.1016/j.cemconcomp.2021.104385.
Full text not available from this repository.Abstract
In this work, the strength and microstructural changes in the interfacial transition zone (ITZ) of four individual concrete mixes containing four different materials (natural aggregate (NA), recycled concrete aggregate (RA), ceramsite (CA), and carbonated steel slag aggregate (SSA)) as 100% coarse aggregate replacement were inves-tigated. The major takeaway from this work is the formation of better quality ITZ due to the use of carbonated SSA, as reflected by the higher microhardness and denser microstructure. The presence of calcite on the outer surface of SSA helps to form monocarbonate and serves as nucleation site for growth of calcium silicate hydrates, enabling a reduction in porosity and calcium hydroxide content by 56% and 80%, respectively compared to the NA concrete. As a result, SSA concrete achieved similar 28-day compressive strength as the NA concrete. This excitingly brings a new insight into how enhancement of the ITZ region could fully compensate the lower intrinsic strength of alternative aggregate used in the concrete.
| Item Type: | Article |
|---|---|
| Funders: | National Natural Science Foundation of China (NSFC), 52078202, China Hunan Provincial Science & Technology Department "Program for Innovative Talents of Excellent Postdoctoral Fellow", 2020RC2031 |
| Uncontrolled Keywords: | Interfacial transition zone; Artificial aggregates; Microstructure; Microhardness; C -S -H nucleation |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Engineering > Department of Civil Engineering |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 19 Nov 2023 12:07 |
| Last Modified: | 19 Nov 2023 12:07 |
| URI: | http://eprints.um.edu.my/id/eprint/42337 |
Actions (login required)
 |
View Item |
