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Calcium sulfate slag and lime mixing and maturing Calcium sulfate slag and lime mixing and maturing Calcium sulfate slag and lime mixing and maturing
Activation of slag: Comparative study of cement, lime, Calcium
2019年7月15日 Specimens prepared from calcium sulfate, blastfurnace slag, and ordinary portland cement exhibit better mechanical performance compared to admixtures prepared from other mix ratiosSpecimens prepared from calcium sulfate, blastfurnace slag, and ordinary portland 登录2020年12月4日 This paper explores the replacement of different base cements (CEM II AL and CEM I (425 R)) with slags of different fineness in mixes containing a novel accelerating Activation of slag: a comparative study of cement, lime, calcium The concrete mixes used in this study had 28 d mean strengths of 50 and 30 MPa and also had Portland cement (PC) partially replaced with ground granulated blastfurnace slag (GGBS) and Activation of slag: a comparative study of cement, lime, calcium
Strength characteristics of limeactivated slag cement
2015年10月1日 For example, calcium sulfate can be added to CaOactivated slag binders to promote the precipitation of fiberlike ettringite, which forms rapidly and provides an 2019年8月14日 We discuss the influence of calcium sulfates on the fluidity of highflow concrete made with ground granulated blastfurnace slag (BFS) and polycarboxylatebased Activation of slag: a comparative study of cement, lime, calcium 2023年9月8日 This article presents a study on alkaliactivated slag cementitious materials that were doped with varying levels of calcium chloride and calcium sulfate The article delves into The competitive hydration of SO42 and Cl− in alkaliactivated 2023年12月1日 Combination of limestone and sulphates in ternary blends efficiently exploit aluminate consumption into hydrates and, macroporosity to sustain slag hydration Calcium Early age reaction of slag in composite cement: Impact of
Activation of slag: Comparative study of cement, lime, Calcium
Activation of slag: Comparative study of cement, lime, Calcium Sulphate, GGBS fineness and temperature Magazine of Concrete Research ( IF 18) Pub Date : , DOI: 2017年4月13日 The results obtained show that the sulfate is more effective in activating the activity of the slag cement than the other chemical activators Specimens prepared from Hydration and Properties of Slag Cement Activated by Alkali and 2014年3月7日 The setting characteristics of slaglime mixes were studied by Feret and Jolibois and Nicol by using granulated slag and high calcium lime The slow setting of the mixes was improved by adding sodium sulfate to the extent Hydration Products, Morphology and Microstructure 2022年10月1日 The use of silica fume and ground granulated blastfurnace slag (GGBS) as a precursor to lime has been proven to be an effective sulfate soil stabilisation technique(PDF) Sulfate soil stabilisation with binary blends of
Calcium Sulfate Precipitation Throughout Its Phase
2016年12月22日 A possible clue to the answer to this question has recently been reported by Tritschler et al (2015a, b), who investigated the influence of organic (co)solvents on the precipitation behavior of calcium sulfate By mixing 2022年5月1日 Coal is the dominant fuel in China to provide primary energy, and 70% of polyvinyl chloride is produced from coalbased CaC 2CaC 2 reacts with water to produce acetylene and calcium carbide slag (CCS) as a solid waste for polyvinyl chloride production Approximate 40 million tons of dry CCS are generated annually in China, among which only a Recycling and utilization of calcium carbide slag ScienceDirect2024年2月20日 Steel slag is a kind of bulk alkaline industrial solid waste produced in the steelmaking process Resource utilization of this solid waste is an urgent problem to be solved in the steel industry to achieve green and lowcarbon development Carbonation of steel slag is one of the key technologies for the utilization of steel slag and the reduction of CO2 emission It is Research on the Leaching of Calcium Ions from Devanadiumized 2013年3月1日 In recent years, researchers have been trying to use different types of byproducts, such as pulverized fuel ash (PFA) and ground granulated blastfurnace slag (hereafter referred to as slag), as partial replacements of PC in order to reduce the energy consumption and CO 2 emission associated with the concrete industry However, despite this use, the vast Hydration and properties of sodium sulfate activated slag
Activation of slag: Comparative study of cement, lime, Calcium
Activation of slag: Comparative study of cement, lime, Calcium Sulphate, GGBS fineness and temperature Magazine of Concrete Research ( IF 18) Pub Date : , DOI: 101680/jmacr19年10月31日 Porosity as a function of calcium sulfate for nonsubstituted (a) and substituted systems with 20 wt% of limestone (b) Comparison between MIP and thermodynamic simulation(PDF) Limestone reaction in calcium aluminate cement–calcium sulfate 2005年8月1日 Induction time as a function of temperature and lime concentration for the precipitation of gypsum from lime suspension (100 g dm−3) and 23% waste sulfuric acid solutionContinuous Precipitation of Calcium Sulfate Dihydrate from 2023年5月12日 In this study, the influence of calcium formate (CF) on the hydration of a synthesized calcium sulfate hemihydrate (HH) powder was investigated Isothermal calorimetry measurements showed that CF retards the hydration reaction of HH This was confirmed by XRD of stored samples and pore solution analysis Two retardation mechanisms were identified The influence of calcium formate on the hydration of calcium sulfate
Calcium sulfate precipitation pathways in natural and engineered
2019年12月30日 Calcium sulfate comprises a group of minerals commonly found in natural and engineered environments When CaSO 4 is precipitated from aqueous solutions three crystalline phases can be obtained (Fig 1): gypsum (CaSO 4 2H 2 O), bassanite (CaSO 4 05H 2 O) and anhydrite (CaSO 4)The intersection of the solubility curves of the different hydrates defines 2018年4月30日 Considerable attention has been given to special cements, capable of reducing CO2 emissions, energy and limestone consumption Supersulfated cements are made of blast furnace slag (GBFS), calcium sulfate (CS), and small quantities of activator, but achieving their optimal proportions is complex In this paper, the effects of the both CS and alkali activator Hydration mechanisms of supersulfated cement Journal of 2023年2月11日 Calciumbased desulfurization ash (CDA) is mainly produced in dry and semidry flue gas desulfurization processes The property of CDA is extremely unstable because its main component, calcium sulfite, makes it difficult to be directly applied to the field of building materials The modification of desulfurization ash can be realized by hightemperature Resource utilization of flue gas calciumbased desulfurization ash: 2019年8月9日 Lime treatment of sulphatebearing clay soils has been shown to adversely affect their properties In the current work, the effects of soaking untreated and limestabilized kaolinite samples in water and sodium and calcium sulphate on swelling and unconfined compressive strength are investigated and compared Specimens were treated with 1, 3, or 5% lime and Effects of sodium and calcium sulphates on volume stability and
Testing and Modeling the ShortTerm Behavior of Lime and Fly
2015年5月5日 In this study, the effects of calcium sulfate contaminated soil treatment methods on the index properties, compacted soil properties, free swelling and compressive stress strain relationship of a CL soil obtained from the field was investigated Calcium sulfate concentration in the soil was varied up to 4 % (40,000 ppm) and the soil samples were cured for seven days at Calcium appears in the second column of the periodic table, the alkaline earths, along with magnesium and barium US Production of lime was 15 billion kg in 1989 making it the 6th mostproduced chemical in the US One problem with lime, however, is that it Caveman to Chemist Projects: Lime and Lye2020年9月21日 A type of calcium coke was developed for use in the oxythermal process of calcium carbide production The calcium coke was prepared by the copyrolysis of coking coal and calcium carbide slag, which is a solid waste generated from the chloralkali industry The characteristics of the calcium cokes under different conditions were analyzed experimentally Development of calcium coke for CaC2 production using calcium 2024年5月20日 Calcium sulfoaluminatebelite (CSAB) cement is considered a viable and environmentally friendly alternative to Portland cement Ye'elimite or calcium sulfoaluminate which is the primary phase of CSAB cement undergoes rapid hydration, leading to the formation of ettringite or monosulfate as the major hydration product The reactivity of ye'elimite can be Earlyage hydration of ye'elimite (calcium sulfoaluminate phase) in
Spent lime, calcium water treatment residuals and application in
2023年2月21日 Calciumbased amendments, such as limestone, slag, burnt lime, and spent lime, have been used in a number of applications However, many of these studies were not specific to phosphorus retention (eg sites contaminated with metals) or influent phosphorus concentrations were much higher than typically encountered in stormwater (eg wastewater CALCIUM SULFATE is noncombustible Decomposes to give toxic oxides of sulfur, but only at very high temperature (>1500 °C) Generally of low reactivity but may act as an oxidizing agent: incompatible with diazomethane, aluminum, and phosphorus Certain forms of calcium sulfate react with water; others do notCalcium sulfate CaSO4 CID 24497 PubChem2020年7月1日 As previously stated, the released sulfates from the oxidation of SCTs can act as an auxiliary activator of AAS, along with NaOH Studies (Aydın and Baradan 2021;Rashad et al 2013; Zhao et al Effect of sodium sulfate on the hydration and mechanical 2005年6月1日 However, when they are used to treat sulfatebearing soils, the soil swelling will occur, which will cause damage or failure to the subgrade and foundations [10,23,34,40]Sulphate attack and ettringite formation in the lime and
Onestep synthesis of nanoscale anhydrous calcium sulfate
2021年12月28日 Gypsums played a vital role in the building materials, and gypsum whiskers were fiberlike crystals with small diameters and high aspect ratios, which performed lightweight, high strength, and green The traditional methods of anhydrous gypsum whiskers through high temperature mostly involve high energy consumption and have potential environmental 2024年3月28日 Supersulfated cement (SSC), a lowcarbon, energyefficient, ecofriendly cementitious material, is mainly made from industrial byproducts However, SSC’s slow early strength development leads to inadequate initial hardening and reduced durability, which restricts its practical application This study investigated the potential enhancement of SSC by Effect of Calcium Aluminate and Carbide Slag on Mechanical2018年12月5日 This study investigated the influences of CaSO4 type (ie, anhydrite vs gypsum) on strength development and reaction products in the activation of ground granulated blastfurnace slag (GGBFS (PDF) Influence of Calcium Sulfate Type on Evolution of Reaction 1 Calcium Carbonate [CaCO3] is the chemical description for pure or highcalcium lime products, normally found in nature (limestone, oyster shells) This material is sometimes sold crushed for use in lawn care and agricultural it is not suitable for mortar 2 Calcium Oxide [CaO] or Quicklime is produced by firing Calcium Carbonate to 900° and driving off CO2Lime types and their meanings explained in our Glossary!
Hydration and properties of sodium sulfate activated slag
2013年3月1日 Interest in alkaliactivated slag as a construction material is increasing, primarily due to its environmentally friendly nature Although strong alkaline activators, such as sodium hydroxide and 2022年4月1日 The sample preparation was commenced by the drymixing of powders (CSA clinker, slag, and calcium sulfate) for 5 min Water was then added to the dry mixture, which was additionally agitated for 5 min After the mixing process was completed, the mixture was initially hardened for one dayEffect of the molar ratio of calcium sulfate over ye'elimite on the 1 Introduction The basic oxygen steelmaking (BOS) process produced over 70% of the global crude steel in 2018, [] generating 100 to 150 kg of slag (“BOS slag”) for every tonne of crude steel produced BOS slag, a product of hot metal element (eg, Si, Mn, Fe, P) oxidation and flux (eg, lime, dolomite) dissolution, plays a critical role in the production of highquality crude steelBasic Oxygen Steelmaking Slag: Formation, Reaction, and Energy 2013年8月1日 While the combination of lime and GGBS has been utilised for stabilisation of gypseous soils [16, 38, [44][45][46][47], there is still insufficient information on vital parameters such as soaked Effects of ground granulated blastfurnace slag (GGBS) on the
The competitive hydration of SO42 and Cl− in alkaliactivated slag
2023年9月8日 Slag as a cementitious material can effectively bind chloride ions, and the amount of chloride ions solidified by the slurry is generally higher than that of ordinary portland cement slurry [24]In terms of the effects of varying cation species on the chloride ions diffusion behavior of alkaliactivated slag mortar, Ca 2+ has proven to be the most effective [25]2015年8月7日 To realize the comprehensive utilization of coalfired industrial solid wastes, a novel highstrength board was prepared from calcium silicate slag, fly ash, and flue gas desulfurization (FGD) gypsum The changes in mineral phases, chemical structure, and morphology during hydration were investigated by Xray diffraction (XRD), Fourier transform Preparation and characterization of highstrength calcium 4 天之前 All lime rates recommended by the NCDACS laboratory are based on a concept of standard agricultural lime with a CCE of 90% (09) and a fineness meeting the minimum North Carolina lime law requirements for a dolomitic Soil Acidity and Liming: Basic Information for Farmers Diaf N, Hidjeb M, Boudjellal K, Boudiaf M, and Lamri I 2 technical reasons and environmental concerns associated with its production A comparativeOptimization of the Combined Effect of Lime and Ground
Hydration and Properties of Slag Cement Activated by Alkali and Sulfate
DOI: 101061/(ASCE)MT19435533 Corpus ID: ; Hydration and Properties of Slag Cement Activated by Alkali and Sulfate @article{Zhang2017HydrationAP, title={Hydration and Properties of Slag Cement Activated by Alkali and Sulfate}, author={Lei Zhang and Bing Chen}, journal={Journal of Materials in Civil Engineering}, year={2017}, volume={29}, 2024年2月26日 With the increasing accumulation of alkaline industrial solid waste, the mineralization of CO2 using alkaline industrial solid waste has broad application prospects Carbide slag is highly alkaline and contains a large amount of calcium elements, making it an excellent material for CO2 mineralization Our idea was to acquire qualified products and fast Research on Utilizable Calcium from Calcium Carbide Slag with 2005年6月1日 The application of cement and lime to improve the characteristics of soft fine grained soils is not new (Broms and Boman, 1975, Narasimha Rao and Rajasekaran, 1996, Okumura and Terashi, 1975)However, recent studies on cement and lime treated soils showed swelling and pavement failures due to the formation of high swelling minerals such as ettringite Sulphate attack and ettringite formation in the lime and cement 2022年6月29日 Expansive soil encounters large changes in strength and volume with the water content alteration for rich in hydrophilic montmorillonite minerals It can be physically/chemically modified to suppress the water sensitivity by mixing with recycled industrial byproducts (iron tailing sand and calcium carbide slag in this case) as the backfilling material of subgrades for Expansive soil modified by iron tailing sand and calcium carbide slag
Hydration mechanisms of supersulfated cement: The role of
2018年4月30日 SSC have been used for decades and are usually composed of up to 90% blast furnace slag (BFS, SSCBFS), 515% calcium sulfate (CS) and 515% of an alkaline activator; the latter is mainly Portland 2017年3月3日 The phenomena of desalination processes of the waters containing a considerable amount of calcium are occurs both in cases of the pressuredriven membrane and electro membrane processes, and is Beneficiation and Mineral Processing of Calcium Carbonate and Calcium