scholarly journals Cementitious Behavior of Argon Oxygen Decarburization Stainless Steel Slag and Its Stabilization on Chromium

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 876
Author(s):  
Ya-Jun Wang ◽  
Ya-Nan Zeng ◽  
Jun-Guo Li ◽  
Yu-Zhu Zhang
Keyword(s):  
Setting Time ◽  
Steel Slag ◽  
Water Requirement ◽  
Curing Time ◽  
Stainless Steel Slag ◽  
Supplementary Cementitious Material ◽  
Slag Powder ◽  
Steel Slag Powder ◽  
Argon Oxygen Decarburization ◽  
Hydration Characteristics

The study mainly aims at the potential of Argon Oxygen Decarburization Slag (AODS) as a supplementary cementitious material and explores the mechanisms of stabilization/solidification (S/S) of chromium in cement-based composite pastes. The basic cementitious parameters, such as water requirement, setting time, soundness, hydration characteristics, and strength indexes of composite binders, were examined through standard methods. The results showed that the most beneficial mineral phase in AODS for cementitious behavior was beta dicalcium silicate (β-C2S). The utilization of a higher AODS dosage in composite binders increased the water requirement and the setting time, while it decreased the hydration heat and the strength indexes. Although the AODS possessed limited cementitious properties, it conformed the Grade II steel slag powder qualified for concrete and cement. Sequential leaching tests were conducted targeting the leachability of chromium in the pastes with different AODS dosage and curing time. Results showed that with the lower AODS dosage and the longer curing time, the S/S efficiency for chromium leaching from the composite paste was better. Utilization of AODS as a cement substitute not only can recycle this solid waste and decrease the emission of CO2 concerning cement production, but also helps to effectively reduce the chromium leaching risk.

The Application of the Steel Slag in the Radiation Shield Heavy Concrete

2013 ◽  
Vol 743-744 ◽  
pp. 258-268
Author(s):  
Ru Guang Li ◽  
Sheng Yin Zhou ◽  
Kun Tian ◽  
Peng Yao
Keyword(s):  
Early Stage ◽  
Setting Time ◽  
Steel Slag ◽  
Water Requirement ◽  
Radiation Shield ◽  
Slag Powder ◽  
Steel Slag Powder ◽  
Different Content

The steel slag was broken into steel slag powders and sands. The performance of the radiation shield heavy concrete was studied in this work by mixing different content of steel slag sand and powder. The results showed that the water requirement of normal consistency and setting time increased with the increase of the content of the steel slag powder. The strength reduced in the early stage of the experiment. The strength increased firstly and decreased later. The optimal content of steel slag powder for strength was 20%. For the steel slag powder and sand, whether the concrete added one or two components, the concrete slump loss increased and strength reduced at 3 days. The steel slag powder and sand added into concrete improved the performance of the concrete effectively, solved the heavy aggregate subsidence and improved the concrete homogenous.

Effects of Ultrafine Grinded Steel Slag Addition on Properties of Cement

2014 ◽  
Vol 804 ◽  
pp. 67-70 ◽  
Author(s):  
Yan Shi ◽  
Hai Yan Chen ◽  
Jia Wang
Keyword(s):  
Particle Size ◽  
Chemical Composition ◽  
Cement Mortar ◽  
Setting Time ◽  
Steel Slag ◽  
Standard Requirement ◽  
Slag Powder ◽  
Gelling Properties ◽  
Steel Slag Powder ◽  
The Stability

The steel slag was ultrafine grinded to different particle size, the chemical composition and mineral composition of steel slag were analyzed. The effects of amount of steel slag addition and particle size on the cement gelling properties were studied. The results showed that, with the decrease of the particle size of steel slag, both of the water requirement of normal consistency and the setting time which meet the standard requirement of cement was increased. The stability of cement mixed with ultrafine grinded steel slag were all qualified after testing. The strength of cement mortar was decreased with the increase of ultrafine grinded steel slag. When the content of steel slag powder was above 30wt%, the strength of cement mortar was decreased significantly.

scholarly journals Effect of nano and micro conductive materials on conductive properties of carbon fiber reinforced concrete

2020 ◽  
Vol 9 (1) ◽  
pp. 445-454 ◽  
Author(s):  
Juhong Han ◽  
Dunbin Wang ◽  
Peng Zhang
Keyword(s):  
Carbon Fiber ◽  
Carbon Black ◽  
Steel Slag ◽  
Pressure Sensitivity ◽  
Electric Conduction ◽  
Conductive Materials ◽  
Slag Powder ◽  
Steel Slag Powder ◽  
Resistivity Variation ◽  
Nano Carbon

AbstractIn this study, the pressure sensitivity and temperature sensitivity of the diphasic electric conduction concrete were investigated by measuring the resistivity using the four-electrode method. The diphasic electric conduction concrete was obtained by mixing nano and micro conductive materials (carbon nanofibers, nano carbon black and steel slag powder) into the carbon fiber reinforced concrete (CFRC). The results indicated that, with the increase of conduction time, the resistivity of CFRC decreased slightly at the initial stage and then became steady, while the resistivity of CFRC containing nano carbon black had a sharp decrease at the dosage of 0.6%. With the increase of compression load, the coefficient of resistivity variation of CFRC containing nano carbon black and steel slag powder changed little. The coefficient of resistivity variation increased with the increase of steel slag powder in the dry environment, and CFRC had preferable pressure sensitivity when the mass fractions of carbon fiber and carbon nanofiber were 0.4% and 0.6%, respectively. Besides, in the humid environment, the coefficient of resistivity variation decreased with the increase of steel slag powder, and the diphasic electric conduction concrete containing 0.4% carbon fibers and 20% steel slag powder had the best pressure sensitivity under the damp environment. Moreover, in the dry environment, CFRC containing nano and micro conductive materials presented better temperature sensitivity in the heating stage than in the cooling stage no matter carbon nanofiber, nano carbon black or steel slag powder was used, especially for the CFRC containing steel slag powder.

The Properties of Flue Gas Desulphurization (FGD) Gypsum

2011 ◽  
Vol 105-107 ◽  
pp. 2204-2208 ◽  
Author(s):  
Run Xia Hao ◽  
Xiao Yan Guo
Keyword(s):  
Mechanical Properties ◽  
Flue Gas ◽  
Steel Slag ◽  
Optical Microscope ◽  
Cementitious Material ◽  
Fgd Gypsum ◽  
Technical Performance ◽  
Slag Powder ◽  
Steel Slag Powder ◽  
Flue Gas Desulphurization

The properties of flue gas desulphurization (FGD) gypsum were analysized by Thermo-gravimetry/differential scanning calorimetry (TG/DSC), technical performance analysis, optical microscope and Scanning electron microscope (SEM). Mechanical properties of FGD gypsum-steel slag powder cementitious material were researched. The results revealed that FGD gypsum have similar moisture content, major component CaSO4·2H2O with natural gypsum, and has better technical performance than natural gypsum. The results of optical microscope and SEM of the FGD gypsum hydration support this further. When the dosage of steel slag powder is 15%, containing activator ,better mechanical properties can be obtained. Key words: FGD gypsum, Property, Cementitious material

Quaternary blended cement mortars containing wood ash, glass and slag powders

2021 ◽  
Author(s):  
Eethar Thanon Dawood ◽  
Marwa Saadi Mhmood
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Glass Powder ◽  
Steel Slag ◽  
Wood Ash ◽  
Supplementary Cementitious Materials ◽  
Partial Replacement ◽  
Slag Powder ◽  
Steel Slag Powder

AbstractA quaternary supplementary cementitious materials as partial replacement of ordinary Portland cement decreases CO2 emission. This paper has investigated the properties of mortars made from different quaternary blends of wood ash, steel slag powder and glass powder with ordinary Portland cement at different replacement levels of 0, 24, 25, and 30% by weight of the binder. The blended mortar mixtures tested for flow, compressive strength and density. The results showed that the flow of mortars is decreased with the combined use of steel slag powder, glass powder, and wood ash compared with control mix. Compressive strength reduced with the combination of steel slag powder, glass powder and wood ash but this reduction effects is acceptable especially at 24% replacement contain super-plasticizer compared with the ecological benefit.

Effect of ground steel slag powder on cement properties

2015 ◽  
Vol 19 (sup1) ◽  
pp. S1-150-S1-153 ◽  
Author(s):  
F. Liu ◽  
M. Z. Chen ◽  
F. Z. Li ◽  
Q. L. Li ◽  
S. P. Wu ◽  
...  
Keyword(s):  
Steel Slag ◽  
Slag Powder ◽  
Steel Slag Powder
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