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Role of ammonium citrate in the preparation of high-strength carbonated steel slag cementitious materials
Abstract Steel slag as a cementitious material exhibits enormous potential and feasibility through carbonation curing. In this study, the influences of Ammonium Citrate (AC) on the CO2 uptake, microstructure and properties of the carbonated steel slag cementitious materials were investigated from two perspectives: leaching of calcium and dissolution of CO2. The results showed that AC, as a pH regulator and chelating agent, can promote the leaching of calcium before carbonation and the dissolution of CO2 during carbonation curing. When the concentration of AC was within the range of 0–0.1 mol/L, the dissolved CO2 tended to react with Ca2+ and calcium citrate (AC-Ca) in steel slag samples, which increased the carbonation efficiency, and filling of pores by CaCO3 led to a rapid increase in the compressive strength. With the aid of AC, high-strength carbonated steel slag cementitious materials were prepared. Under optimal addition of AC (0.1 mol/L), CO2 uptake and compressive strength in carbonated steel slag cementitious materials with the densest pore structure reached 17.22 g/100 g steel slag and 99.2 MPa, respectively. However, with the overloading of AC (＞0.1 mol/L), the dissolved CO2 tended to react with C-S-H gels due to the high bonding strength between and Ca2+, which accelerated the decalcification of C-S-H gels and divided the large pores into countless small pores in steel slag cementitious materials.
Graphical Abstract Display Omitted
Highlights High-strength carbonated steel slag cementitious materials are prepared. AC promotes calcium leaching and CO2 dissolution in the liquid phase. AC affects the pore and C-S-H polymerization of carbonated steel slag cementitious materials.
Role of ammonium citrate in the preparation of high-strength carbonated steel slag cementitious materials
Abstract Steel slag as a cementitious material exhibits enormous potential and feasibility through carbonation curing. In this study, the influences of Ammonium Citrate (AC) on the CO2 uptake, microstructure and properties of the carbonated steel slag cementitious materials were investigated from two perspectives: leaching of calcium and dissolution of CO2. The results showed that AC, as a pH regulator and chelating agent, can promote the leaching of calcium before carbonation and the dissolution of CO2 during carbonation curing. When the concentration of AC was within the range of 0–0.1 mol/L, the dissolved CO2 tended to react with Ca2+ and calcium citrate (AC-Ca) in steel slag samples, which increased the carbonation efficiency, and filling of pores by CaCO3 led to a rapid increase in the compressive strength. With the aid of AC, high-strength carbonated steel slag cementitious materials were prepared. Under optimal addition of AC (0.1 mol/L), CO2 uptake and compressive strength in carbonated steel slag cementitious materials with the densest pore structure reached 17.22 g/100 g steel slag and 99.2 MPa, respectively. However, with the overloading of AC (＞0.1 mol/L), the dissolved CO2 tended to react with C-S-H gels due to the high bonding strength between and Ca2+, which accelerated the decalcification of C-S-H gels and divided the large pores into countless small pores in steel slag cementitious materials.
Graphical Abstract Display Omitted
Highlights High-strength carbonated steel slag cementitious materials are prepared. AC promotes calcium leaching and CO2 dissolution in the liquid phase. AC affects the pore and C-S-H polymerization of carbonated steel slag cementitious materials.
Role of ammonium citrate in the preparation of high-strength carbonated steel slag cementitious materials
Chen, Zhaohou (author) / Liu, Yang (author) / He, Bingyang (author) / Jing, Xiaohuan (author) / Cang, Daqiang (author) / Zhang, Lingling (author)
2024-02-25
Article (Journal)
Electronic Resource
English
CARBONATED CEMENTITIOUS MATERIALS AND THEIR ROLE IN CO2SEQUESTRATION
| Springer Verlag | 2006
Carbonated Cementitious Materials and Their Role in CO~2 Sequestration
| British Library Conference Proceedings | 2006
| Elsevier | 2024