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In-Depth Insight into the Effects of Steel Slag and Calcium Hydroxide on the Properties of a Fly Ash–Red Mud Geopolymer.
- Source :
- Materials (1996-1944); Mar2024, Vol. 17 Issue 6, p1249, 12p
- Publication Year :
- 2024
-
Abstract
- The low mechanical strength of a low-calcium fly ash (FA)–red mud (RM) geopolymer severely limits its application. Steel slag (SS) and Ca(OH)<subscript>2</subscript> can provide calcium and alkali for the hydration process of a low-calcium FA-based geopolymer. In this study, SS was used to replace part of the RM, and Ca(OH)<subscript>2</subscript> was introduced. The effects of SS and Ca(OH)<subscript>2</subscript> on the properties of the FA-RM geopolymer were investigated. The experimental results show that SS promoted the matrix to generate more C(N)-A-S-H and C-S-H gels and optimized the pore structure, thereby improving the mechanical properties of the FA-based geopolymer. The addition of 4 wt.% Ca(OH)<subscript>2</subscript> increased the hydration products of the FA-based geopolymer, the microstructure was denser, and the mechanical properties were significantly improved. The 28 d compressive strength of the FA-based ternary composite geopolymer prepared by replacing part of the RM with SS and adding Ca(OH)<subscript>2</subscript> reached 30.6 MPa, which provided an experimental basis for the resource utilization of various bulk solid wastes. [ABSTRACT FROM AUTHOR]
- Subjects :
- SLAG
BULK solids
INORGANIC polymers
POROSITY
MUD
FLY ash
CALCIUM hydroxide
Subjects
Details
- Language :
- English
- ISSN :
- 19961944
- Volume :
- 17
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Materials (1996-1944)
- Publication Type :
- Academic Journal
- Accession number :
- 176367120
- Full Text :
- https://doi.org/10.3390/ma17061249