scholarly journals Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

10.3791/55062 ◽  
2017 ◽  
Author(s):  
Evangelos Georgakopoulos ◽  
Rafael M. Santos ◽  
Yi Wai Chiang ◽  
Vasilije Manovic
Keyword(s):  
Heavy Metal ◽  
Blast Furnace ◽  
Calcium Carbonate ◽  
Blast Furnace Slag ◽  
Precipitated Calcium Carbonate ◽  
Heavy Metal Adsorbent ◽  
Furnace Slag

Changes in Heavy Metal Content of Blast Furnace Slag Cement According to Blast Furnace Slag Content

2018 ◽  
Vol 35 (4) ◽  
pp. 356-361
Author(s):  
Yong-Jun Kim ◽  
Nam-Il Uhm ◽  
Woo-Il Kim ◽  
Jung-Keun Oh ◽  
Sun-Kyoung Shin ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Metal Content ◽  
Heavy Metal Content ◽  
Slag Cement ◽  
Furnace Slag ◽  
Slag Content

scholarly journals Effect of Blast-Furnace Slag Replacement Ratio and Curing Method on Pore Structure Change after Carbonation on Cement Paste

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4787
Author(s):  
Junho Kim ◽  
Seunghyun Na ◽  
Yukio Hama
Keyword(s):  
Blast Furnace ◽  
Calcium Carbonate ◽  
Pore Structure ◽  
Calcium Silicate ◽  
Blast Furnace Slag ◽  
Calcium Silicate Hydrate ◽  
Structure Change ◽  
Replacement Rate ◽  
Replacement Ratio ◽  
Furnace Slag

The frost damage resistance of blast-furnace slag (BFS) cement is affected by carbonation. Hence, this study investigates the carbonation properties of pastes incorporating BFS with different replacement ratios, such as 15%, 45%, and 65% by weight, and different curing conditions, including air and carbonation. The BFS replacement ratio properties, determined by the Ca/Si ratio of calcium silicate hydrate in the cement paste sample, were experimentally investigated using mercury intrusion porosimetry, X-ray diffraction, and thermal analysis. The experimental investigation of the pore structure revealed that total porosity decreased after carbonation. In addition, the porosity decreased at a higher rate as the BFS replacement rate increased. Results obtained from this study show that the chemical change led to the higher replacement rate of BFS, which produced a higher amount of vaterite. In addition, the lower the Ca/Si ratio, the higher the amount of calcium carbonate originating from calcium silicate hydrate rather than from calcium hydroxide. As a result of the pore structure change, the number of ink-bottle pores was remarkably reduced by carbonation. Comparing the pore structure change in air-cured and carbonation test specimens, it was found that as the replacement rate of BFS increased, the number of pores with a diameter of 100 nm or more also increased. The higher the replacement rate of BFS, the higher the amount of calcium carbonate produced compared with the amount of calcium hydroxide produced during water curing. Due to the generation of calcium carbonate and the change in pores, the overall number of pores decreased as the amount of calcium carbonate increased.

Synthesis of calcium carbonate powder from air-cooled blast furnace slag under pressurized CO2atmosphere

2012 ◽  
Vol 15 (4) ◽  
pp. 292-298 ◽  
Author(s):  
Seong-Ho Lee ◽  
Joobeom Seo ◽  
Kwang-Suk You ◽  
Thenepalli Thriveni ◽  
Ji-Whan Ahn
Keyword(s):  
Blast Furnace ◽  
Calcium Carbonate ◽  
Blast Furnace Slag ◽  
Furnace Slag

scholarly journals Influence of Pb Dosage on Immobilization Characteristics of Different Types of Alkali-Activated Mixtures and Mortars

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Jan Koplík ◽  
Jaromír Pořízka ◽  
Lukáš Kalina ◽  
Jiří Másilko ◽  
Matěj Březina
Keyword(s):  
Mechanical Properties ◽  
Heavy Metals ◽  
Heavy Metal ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Inductively Coupled Plasma ◽  
Raw Materials ◽  
Leaching Tests ◽  
Furnace Slag ◽  
Alkali Activated

Alkali-activated matrices are suitable materials for the immobilization of hazardous materials such as heavy metals. This paper is focused on the comparison of immobilization characteristics of various inorganic composite materials based on blast furnace slag and on the influence of various dosages of the heavy metal Pb on the mechanical properties and fixation ability of prepared matrices. Blast furnace slag (BFS), fly ash, and standard sand were used as raw materials, and sodium water glass was used as an alkaline activator. Pb(NO3)2served as a source of heavy metal and was added in various dosages in solid state or as aqueous solution. The immobilization characteristics were determined by leaching tests, and the content of Pb in the eluate was measured by inductively coupled plasma optical emission spectroscopy (ICP-OES). The microstructure of matrices and distribution of Pb within the matrix were determined by scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS). Increasing the dosage of the heavy metal had negative impacts on the mechanical properties of prepared matrices. The leaching tests confirmed the ability of alkali-activated materials to immobilize heavy metals. With increasing addition of Pb, its content in eluates increased.

scholarly journals Reactivity Effect of Calcium Carbonate on the Formation of Carboaluminate Phases in Ground Granulated Blast Furnace Slag Blended Cements

2021 ◽  
Vol 13 (11) ◽  
pp. 6504
Author(s):  
Walid Deboucha ◽  
Nassim Sebaibi ◽  
Yassine El Mendili ◽  
Aurélie Fabien ◽  
U. Johnson Alengaram ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Calcium Carbonate ◽  
Blast Furnace Slag ◽  
Blended Cement ◽  
Reactivity Effect ◽  
Limestone Filler ◽  
Cement Pastes ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag ◽  
Reaction Degree

The reactivity effect of calcium carbonate, present in ground oyster shells and limestone filler, on the formation of carboaluminate phases in ground granulated blast furnace slag blended cement pastes was reported in this paper. Six different binary and ternary blended cement pastes were prepared using ground granulated blast furnace slag, ground oyster shells and limestone filler with different replacement levels (from 5 to 35%). The carboaluminate formation was assessed and quantified directly using X-ray diffraction (XRD), and indirectly by following the aluminate phase’s reaction (heat flow) and consumed calcium carbonate using Isothermal Calorimetry (IC) and Thermogravimetric Analysis (TGA), respectively. Further, the overall reaction degree calculated based on TGA results and the compressive strength were determined to support the findings obtained. The results revealed that the calcium carbonate present in ground oyster shells is more reactive when compared to that present in limestone filler, where more formed hemi- and monocarboaluminate phases were observed in mixtures containing ground oyster shells. An enhancement in compressive strength and overall reaction degree was observed by adding 5% ground oyster shells as cement replacement.

Study on the Shrinkage of a Full-Scale Wall Made with Blast Furnace Slag Fine Aggregates

CONCREEP 10 ◽  
2015 ◽  
Author(s):  
Tomiyuki Kaneko ◽  
Keiichi Imamoto ◽  
Chizuru Kiyohara ◽  
Akio Tanaka ◽  
Ayuko Ishikawa
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Full Scale ◽  
Fine Aggregates ◽  
Furnace Slag
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