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.

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.

Effect of steel slag powder, fly ash, and silica fume on the mechanical properties and durability of cement mortar

2019 ◽  
Vol 9 (9) ◽  
pp. 1049-1054
Author(s):  
Yunxia Lun ◽  
Fangfang Zheng
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Cement Mortar ◽  
Steel Slag ◽  
Mineral Admixtures ◽  
Partial Replacement ◽  
Slag Powder ◽  
Steel Slag Powder

This study is aimed at exploring the effect of steel slag powder (SSP), fly ash (FA), and silica fume (SF) on the mechanical properties and durability of cement mortar. SSP, SF, and FA were used as partial replacement of the Ordinary Portland cement (OPC). It was showed that the compressive and bending strength of steel slag powder were slightly lower than that of OPC. An increase in the SSP content caused a decrease in strength. However, the growth rate of compressive strength of SSP2 (20% replacement by the weight of OPC) at the curing ages of 90 days was about 8% higher than that of OPC, and the durability of SSP2 was better than that of OPC. The combination of mineral admixtures improved the later strength, water impermeability, and sulfate resistance compared with OPC and SSP2. The compressive strength of SSPFA (SSP and SF) at 90 days reached 70.3 MPa. The results of X-ray diffraction patterns and scanning electron microscopy indicated that SSP played a synergistic role with FA or SF to improve the performance of cement mortar.

Gray System Study on the Influence of Particle Size Distribution of Steel-Slag Powder on Performance of Cementitious Materials

2012 ◽  
Vol 531-532 ◽  
pp. 684-688
Author(s):  
Tu Sheng He ◽  
Xu Guang Zhao ◽  
San Yin Zhao ◽  
Zai Bo Li
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Steel Slag ◽  
Grey System Theory ◽  
Converter Steel ◽  
Maximum Effect ◽  
Gray Model ◽  
Slag Powder ◽  
Steel Slag Powder

Particle size distribution of converter steel-slag powder prepared by ball milling were tested by the Mastersizer2000 laser diffraction particle size analyzer, the strength and fluidity of the cementitous morter made of 30%(mass fraction) steel-slag powder into standard cement were tested, and grey system theory was used to analysis the relationship between particle size distribution of slag powder and properties of mortar, the gray model of GM (0,2) was established between 28d compression strength and 4~8µm particle content. The results show that: the volume fraction of 24~32µm particle has a maximum effect on mortar fluidity, 4~8µm particle has a maximum effect on 7d and 28d mortar compressive strength, positive correlation; The predicted values agree well with measured values according to gray model.

scholarly journals Moisture Susceptibility Evaluation of Asphalt Mixtures Containing Steel Slag Powder as Filler

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3211 ◽  
Author(s):  
Zhifeng Xiao ◽  
Meizhu Chen ◽  
Shaopeng Wu ◽  
Jun Xie ◽  
Dezhi Kong ◽  
...  
Keyword(s):  
Particle Size ◽  
Steel Slag ◽  
Asphalt Mixtures ◽  
Moisture Susceptibility ◽  
Freeze Thaw ◽  
Slag Powder ◽  
Steel Slag Powder ◽  
Split Test ◽  
Marshall Stability ◽  
Asphalt Mortar

The primary objective of this paper was to investigate the effect of replacing steel slag powder (SSP) with limestone filler (LF) with different contents as an inorganic anti-stripping agent on the moisture susceptibility of asphalt mixtures. Two traditional inorganic anti-stripping agents were selected for comparison, namely cement (CE) and slaked lime (SL). Apparent morphology, chemical compositions, and the particle size distribution of the four fillers were firstly studied. LF was replaced by SSP, CE, and SL with different contents, and then mixed with asphalt to prepare asphalt mortars. An 80 °C water immersion test was conducted to investigate the adhesion of asphalt mortar and aggregates, and an image analysis technique was utilized to evaluate the stripping of asphalt from the aggregates. A Marshall stability test and freeze-thaw split test were then conducted to analyze the effect of different fillers on the moisture susceptibility of asphalt mixtures. The results show that SSP contains a large amount of CaO, which indicates that SSP has a certain alkalinity. Compared with LF, SSP has a rougher surface texture and a finer particle size. Image analysis results show that the partially replacement of LF by SSP increases the asphalt coverage rate of aggregates, which means that SSP can improve the adhesion between asphalt mortar and aggregates. However, the excessive addition of SSP will result in a decrease in adhesion. The results of both the Marshall stability test and freeze-thaw split test demonstrate that CE, SL, and SSP can improve the moisture susceptibility of asphalt mixtures compared with the LF group, and that asphalt mixtures containing SSP have better moisture damage resistance than those with CE, but less such resistance than those with SL. With the increase of the amount of SSP replacing LF, the moisture susceptibility of the asphalt mixture decreases gradually. The optimum substitution amount of SSP was 25% of the total volume of fillers in this test.

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.

Microstructure and Properties of High Performance Concrete with Steel Slag Powder

2011 ◽  
Vol 675-677 ◽  
pp. 503-506
Author(s):  
Yun Feng Li
Keyword(s):  
Cement Paste ◽  
High Performance ◽  
High Performance Concrete ◽  
Cement Mortar ◽  
Steel Slag ◽  
Drying Shrinkage ◽  
Mineral Admixture ◽  
Slag Powder ◽  
Steel Slag Powder ◽  
Active Admixture

As an active admixture, super fine steel slag powder can be mixed into concrete to produce high performance concrete. The microstructures between cement paste mixed with steel slag powder and plain cement paste are experimentally studied. The SEM of the microstructures shows that microstructure of cement paste are changed by active mineral admixture, the internal structure of the cement paste are improved. Drying shrinkage of cement mortar with different steel slag kinds and different dosage of admixtures are measured. Experiments results show the effect of steel slag powder on drying shrinkage of cement mortar.

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

scholarly journals Nanomaterials and nanotechnology for the delivery of agrochemicals: strategies towards sustainable agriculture

2022 ◽  
Vol 20 (1) ◽  
Author(s):  
Changcheng An ◽  
Changjiao Sun ◽  
Ningjun Li ◽  
Bingna Huang ◽  
Jiajun Jiang ◽  
...  
Keyword(s):  
Particle Size ◽  
Food Security ◽  
Chemical Composition ◽  
Labor Cost ◽  
Small Particle Size ◽  
Agricultural Systems ◽  
The Stability ◽  
New Applications ◽  
Chemical Pesticides ◽  
Improve Food Security

AbstractNanomaterials (NMs) have received considerable attention in the field of agrochemicals due to their special properties, such as small particle size, surface structure, solubility and chemical composition. The application of NMs and nanotechnology in agrochemicals dramatically overcomes the defects of conventional agrochemicals, including low bioavailability, easy photolysis, and organic solvent pollution, etc. In this review, we describe advances in the application of NMs in chemical pesticides and fertilizers, which are the two earliest and most researched areas of NMs in agrochemicals. Besides, this article concerns with the new applications of NMs in other agrochemicals, such as bio-pesticides, nucleic acid pesticides, plant growth regulators (PGRs), and pheromone. We also discuss challenges and the industrialization trend of NMs in the field of agrochemicals. Constructing nano-agrochemical delivery system via NMs and nanotechnology facilitates the improvement of the stability and dispersion of active ingredients, promotes the precise delivery of agrochemicals, reduces residual pollution and decreases labor cost in different application scenarios, which is potential to maintain the sustainability of agricultural systems and improve food security by increasing the efficacy of agricultural inputs. Graphical Abstract

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