Strength enhancement of CaO-activated slag system through addition of calcium formate as a new auxiliary activator

Cited 0 times inthomson ciCited 0 times inthomson ci
Title
Strength enhancement of CaO-activated slag system through addition of calcium formate as a new auxiliary activator
Author
Yum, Woo SungSuh, Jung-IlJeon, DonghoOh, Jae Eun
Issue Date
2020-05
Publisher
ELSEVIER SCI LTD
Citation
CEMENT & CONCRETE COMPOSITES, v.109, pp.UNSP 10357
Abstract
This study investigated the effect of calcium formate (CF) on the strength development and microstructure of the CaO-activated ground granulated blast furnace slag (GGBFS) system. The main activator (i.e., CaO) was fixed at 4 wt%, and the GGBFS was replaced with CF at 0, 1, 3, and 5 wt%. The use of CF significantly increased the strength of the binder system by inducing (1) more dissolution of GGBFS, (2) greater C-S-H formation although when CF was used over a certain limit (i.e., 3 wt%), the formation of C-S-H began to be disturbed, and most importantly, (3) an increase in C2AH8 formation. In this study, although the greater formation of C2AH8 was the main cause of the strength enhancement, the C2AH8 phase also likely increased porosity and reduced strength as it was metastable; thus, strength increasing effect and reducing effect likely offset each other; thus, with increasing CF dosage, when the former was more dominant, the strength was enhanced (e.g., up to 3 wt%), but when the latter was larger, the strength enhancement decreased (e.g., at 5 wt%).
URI
https://scholarworks.unist.ac.kr/handle/201301/31849
URL
https://www.sciencedirect.com/science/article/pii/S0958946520300640?via%3Dihub
DOI
10.1016/j.cemconcomp.2020.103572
ISSN
0958-9465
Appears in Collections:
UEE_Journal Papers
Files in This Item:
There are no files associated with this item.

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

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

MENU