File Download

There are no files associated with this item.

  • Find it @ UNIST can give you direct access to the published full text of this article. (UNISTARs only)
Related Researcher

표석훈

Pyo, Sukhoon
Innovative Materials for Construction and Transportation Lab.
Read More

Views & Downloads

Detailed Information

Cited time in webofscience Cited time in scopus
Metadata Downloads

On improved microstructure properties of slag-based UHPC incorporating calcium formate and calcium chloride

Author(s)
Oinam, YanchenDahal, MandipMesfin, MinwuyePark, SolmoiKim, Hyeong- KiPyo, Sukhoon
Issued Date
2024-08
DOI
10.1016/j.jobe.2024.109551
URI
https://scholarworks.unist.ac.kr/handle/201301/82998
Citation
JOURNAL OF BUILDING ENGINEERING, v.90, pp.109551
Abstract
The study aimed to achieve high strength in slag-based cementless ultra-high performance concrete (UHPC) while investigating the role of calcium formate and calcium chloride as accelerators using advanced characterization and microstructural analysis. The UHPC specimens were evaluated using various techniques, including heat of hydration, thermogravimetric analysis, X-ray diffraction, nuclear magnetic resonance, scanning electron microscopy, and porosity measurements. The results showed that both accelerators improved the UHPC properties, with calcium formate being more effective than calcium chloride, as evidenced by higher heat of hydration, improved microstructure, and lower porosity. Furthermore, the thermodynamic modeling revealed insightful information on the reaction mechanisms with C-(N-)A-S-H and hydrotalcite as the primary hydration products formed in the matrix. Notably, the UHPC specimens with calcium chloride exhibited a very low pH value, which could increase the risk of corrosion in reinforced structures. Therefore, the use of calcium formate as an accelerator can lead to the development of cementless UHPC with superior properties.
Publisher
ELSEVIER
ISSN
2352-7102
Keyword (Author)
AcceleratorCalcium formateCalcium chlorideThermodynamic modellingCementless UHPC
Keyword
SUPPLEMENTARY CEMENTITIOUS MATERIALSHIGH PERFORMANCE CONCRETEBLAST-FURNACE SLAGSTRENGTH DEVELOPMENTFLY-ASHPASTESTEMPERATUREHYDRATIONAL-27NMR

qrcode

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.