Strength Development and Products Evolution of β-C2S and γ-C3S Induced by Accelerated Carbonation Curing

2020 ◽  
Vol 35 (6) ◽  
pp. 1053-1060
Author(s):  
Yanfeng Fang ◽  
Zhichao Liu ◽  
Qinghe Wang ◽  
Yuzhuo Zhang ◽  
Miao Zhang ◽  
...  
Keyword(s):  
Strength Development ◽  
Accelerated Carbonation ◽  
Carbonation Curing

Mathematical modeling of CO 2 uptake by concrete during accelerated carbonation curing

2015 ◽  
Vol 67 ◽  
pp. 1-10 ◽  
Author(s):  
Sormeh Kashef-Haghighi ◽  
Yixin Shao ◽  
Subhasis Ghoshal
Keyword(s):  
Mathematical Modeling ◽  
Accelerated Carbonation ◽  
Carbonation Curing

scholarly journals Effect of Different CO2 Treatments on the Metal Leaching in Steel Slag Binders

2021 ◽  
Vol 9 ◽  
Author(s):  
Yaojun Liu ◽  
Jingrui Fang ◽  
Songhui Liu ◽  
Xiaopeng An ◽  
Yanwen Kang ◽  
...  
Keyword(s):  
Steel Slag ◽  
High Volume ◽  
Accelerated Carbonation ◽  
Silicate Structure ◽  
The Matrix ◽  
Curing Methods ◽  
Chemical States ◽  
Eaf Slag ◽  
Carbonation Curing

Carbonation is an effective method to promote the quality of the steel slag binder. In this article, two carbonation approaches, namely hot-stage carbonation and accelerated carbonation, were employed to leach the metals, and the influence mechanism on the metal sequential leachability of the binders composed of 80 wt% of EAF slag incorporating 20 wt% of Portland cement (PC) was revealed. The carbonate products, microstructures, and chemical states were investigated, and the results indicated that chromium, vanadium, and titanium gradually transformed into inactive phases after two carbonation approaches, while zinc appeared the opposite trend. The sequential leachability of chromium declined with the increase of the carbonation efficiency, in which the exchangeable chromium decreased from 1.99 mg/kg in the A2A binder to below the detection limit in the A2C binder and C2C binder. Hot-stage carbonation treatment facilitated particle agglomeration, minerals remodeling, and calcite formation. The carbonation curing of the steel slag paste resulted in the formation of amorphous CaCO3, calcite crystalline and Si-bearing hydrates that covered the pores of the matrix, and silicate structure with a higher disorder. The hot-stage carbonation and accelerated carbonation curing methods were adopted to jointly prevent the leaching of harmful metals and facilitate promising high-volume steel slag-based binders with structural densification and CO2 storage.

Accelerated carbonation of steel slag monoliths at low CO2 pressure – microstructure and strength development

2020 ◽  
Vol 36 ◽  
pp. 124-134 ◽  
Author(s):  
P. Nielsen ◽  
M.A. Boone ◽  
L. Horckmans ◽  
R. Snellings ◽  
M. Quaghebeur
Keyword(s):  
Steel Slag ◽  
Strength Development ◽  
Accelerated Carbonation ◽  
Low Co2

The Properties of Steel Slag Bricks Prepared by both Alkali Activation and Accelerated Carbonation

2012 ◽  
Vol 509 ◽  
pp. 113-118 ◽  
Author(s):  
Wen Sheng Zhang ◽  
Di Shi ◽  
Zhong Jun Shao ◽  
Jia Yuan Ye ◽  
Yuan Wang
Keyword(s):  
Compressive Strength ◽  
Dominant Role ◽  
Steel Slag ◽  
Alkali Activation ◽  
Accelerated Carbonation ◽  
Mineral Compositions ◽  
Physical And Chemical ◽  
Carbonation Curing

The physical and chemical evolutions, including strength, porosity, chemical and mineral compositions, of properties of steel slag bricks prepared by both alkali activation and accelerated carbonation were investigated. The results show that alkali activation provides the initial properties, while accelerated carbonation plays a dominant role in such final performances as strength, porosity, chemical and mineral compositions of steel slag bricks. The steel slag bricks with a compressive strength of 33.8MPa, carbonation degree of 8.92% and porosity of 23.25% were successfully prepared after accelerated carbonation curing (T=50°C, RH=60%, P=0.25MPa, ρCO2=80% by volume) for 120min.

scholarly journals Intensive Ways of Producing Carbonate Curing Building Materials Based on Lime Secondary Raw Materials

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2304 ◽  
Author(s):  
Nikolai Lyubomirskiy ◽  
Aleksandr Bakhtin ◽  
Stanisław Fic ◽  
Małgorzata Szafraniec ◽  
Tamara Bakhtinа
Keyword(s):  
Building Materials ◽  
Raw Materials ◽  
Construction Materials ◽  
Co2 Concentration ◽  
Optimization Methods ◽  
Accelerated Carbonation ◽  
Secondary Raw Materials ◽  
Production Wastes ◽  
Limestone Dust ◽  
Carbonation Curing

The article is dedicated to the research and development of intensive methods for curing products by capturing and binding CO2. It aims to improve and increase the productivity of technologies for the production of artificially carbonated building materials and products. Soda production wastes, limestone dust and finely dispersed limestone dust were used as the research objects. Secondary raw materials have been investigated using modern methods of phase composition and granulometry test. Intensive methods of production of accelerated carbonation of systems consisting of soda wastes were tested using multi-parameter optimization methods. The effects of recycled lime materials on the strength and hydrophysical properties of the obtained material were determined. The secondary raw materials effect depended on the composition of the raw mixture, molding conditions, CO2 concentration applied to the carbonate curing chamber, and the duration of exposure to environments with high CO2 content. It was found that the most effective way of providing accelerated carbonation curing of construction materials and products is a combined carbonation method, combining the principles of dynamic and static methods. It was concluded that the optimal CO2 concentration in the gas-air mixtures used for carbonate curing is 30%–40%.

Enhancement of cured cement using environmental waste: particleboards incorporating nano slag

2020 ◽  
Vol 10 (1) ◽  
pp. 273-281
Author(s):  
Isam Mohamad Ali ◽  
Mohammed Salah Nasr ◽  
Ahmed Samir Naje
Keyword(s):  
Cell Walls ◽  
Bending Strength ◽  
Untreated Wood ◽  
Microstructural Properties ◽  
Accelerated Carbonation ◽  
Thickness Swelling ◽  
Microstructural Characteristics ◽  
Curing Method ◽  
Carbonation Curing ◽  
Manufacturing Parameters

AbstractIndustrial waste is constantly increasing, so measures must be taken to recycle it in more practical and environmentally friendly ways. The aim of this study was to investigate the suitability of sawdust wasted particles for the production of cement bonded particleboards, and to enhance their compatibility with cement by using physical pretreatment processes, addition of nano slag and accelerated carbonation curing. All tests were carried out with different manufacturing parameters: sawdust/cement: (20%, 30% and 40%), treated and untreated wood, CO2 curing and the addition of nano slag. Experiments were performed to assess the mechanical properties of produced particleboards such as density (D), water absorption (WA), thickness swelling (TS), bending strength (BS), and microstructural properties of the cement particleboards. For treated sawdust, the outcomes demonstrated an enhancement in the mechanical and microstructural characteristics of produced cement bonded particleboards by using the accelerated CO2 curing method for sawdust particleboards. According to Scanning Electron Microscopy (SEM) micrographs, part of the carbonate crystals was found to be diffused into the cell walls and cavities and were found to protrude from sawdust surfaces.

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