Properties. Chemical properties of different types of ferrous slag vary depending on the specific production process. A common characteristic of these slags is that they result from lime and silica based melts, therefore calcium oxide (CaO) and silica (SiO 2) are their primary components.Other components include alumina (Al 2 O 3) and magnesium oxide (MgO).
a slag with similar properties can be formed as a result of interaction with the BOF slag. BOF slag in combination with olivine pellets with a low basicity generates a slag with intermediate basicity and the reduction of iron oxides in the slag has a small effect on the melting tem- perature.
The acid slag is not binding in contrast to the basic one, but due to the pozzolanic properties it interacts with the calcium hydroxide to form an additional amount of a low-basic hydrated calcium ...
Ground-granulated blast-furnace slag (GGBS or GGBFS) is obtained by quenching molten iron slag (a by-product of iron and steel-making) from a blast furnace in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder.Ground-granulated blast furnace slag is highly cementitious and high in CSH (calcium silicate hydrates) which is a strength enhancing ...
Physical properties of BF slag. BF slag is tapped from the furnace as a liquid, which contains gases held in solution. The density of liquid slag at around 1450 deg C can vary in a range of 2.68 tons/cum to 2.84 tons/cum. The volume of gases (carbon di oxide, nitrogen, and oxygen) dissolved in 1 cubic metre of liquid BF gas at around 1500 deg C ...
Blast furnace slag cement is the mixture of ordinary Portland cement and fine granulated blast furnace slag obtained as a by product in the manufacture of steel with percent under 70% to that of cement. Ground granulated blast furnace slag cement (GGBFS) is a fine glassy granules which contain cementatious properties. In this article we […]
May 09, 2018· This slag is periodically tapped off as a molten liquid and then rapidly quenched with large volumes of water. This process optimizes the cementitious properties and produces granules like coarse sand. This granulated slag is then dried and ground to a fine powder. It is also knows as slag cement because it has similar properties as cement clinker.
Jan 27, 2013· Properties of slag – D E P A R T M E NT O F Metallurgical and MaterialsSulphide capacity of slag Engineering National Institute of Technology, Rourkela• The sulphur affinity of a slag, presented as molar sulphide capacity is defined by the equation: 1 pO 2 x 2− ′ = x 2− 2 CS = K O (20) S pS γ 2− 2 S • or a more useful term wt ...
Slag, by-product formed in smelting, welding, and other metallurgical and combustion processes from impurities in the metals or ores being treated.Slag consists mostly of mixed oxides of elements such as silicon, sulfur, phosphorus, and aluminum; ash; and products formed in their reactions with furnace linings and fluxing substances such as limestone.
Apr 12, 2013· Thermal properties – Due to the high heat capacity, steel making slag aggregates have been observed to retain heat considerably longer than conventional natural aggregates. The heat retention characteristics of steelmaking slag aggregates can be advantageous in …
Jul 01, 2020· The use of slag in concrete has several benefits, including reduced energy, reduced greenhouse gas emissions, and reduced use of raw materials. Various types of slag are produced: - Blast-furnace slag—The nonmetallic product, consisting essentially of silicates and aluminosilicates of calcium and of other bases, that is developed in a molten condition simultaneously with iron in a blast …
slag compositions used in any one process, and a large number of properties involved, there is a need for a vast amount of property data. The measurement of thermo-physical properties of molten slags is both difficult and expensive. Consequently, there has been a drive to develop empirical rules and models to estimate the various properties of ...
The slag property estimation methods described by Ken Mills et al. [36] provide an easy to apply set of temperature dependent equations. The Urbain method was selected for viscosity, being both ...
Adding higher amounts of slag results in a higher sulphate resistance and lower heat of hydration properties. When producing such cement, slag is usually the hardest to grind, and it forms the coarsest portion, while the cement is ground the finest [9]. A potential problem is moisture, which occurs in blast furnace slag during the granulation ...
Properties and Uses of Iron and Steel Slag MF 182-6 NATIONAL SLAG ASSOCIATION Page 5 Granulated blast-furnace slag is produced by quickly quenching (chilling) molten slag to produce a glassy, granular product. The most common process is quenching with water, but air or a combination of air and water may be used.
The properties of the slag depend on the type of process used to produce the crude steel, the cooling conditions of the slag and the valorisation process. In the primary process, crude steel is produced in two ways. In the first method, the iron is produced from ore in the BF, thus, generating BF slag (BFS). BBOF slag (BOFS) is produced in the ...
Slag properties are important since they: (i) have a decisive effect on both process control and on the quality of the product and E. S – 2 (ii) good quality property data are needed to develop reliable mathematical models of the process
Slag cement is commonly found in ready-mixed concrete, precast concrete, masonry, soil cement and high temperature resistant building products. While there are many applications and benefits of slag cement, a few are highlighted below and detailed information sheets are located here.
Drying shrinkage of concrete containing slag; The change in properties of concrete microstructure with the replacement of cement by GGBFS. Setting Time of GGBFS concrete. The GGBFS have lesser demand for water and there is a chance of an increase in the setting time of the concrete.
Mar 08, 2016· Mixes combining steel slag aggregate and conventional aggregates are usually designed volumetrically because of the significant difference in aggregate bulk relative densities. The requirements of ASTM D5106 (11) and ASTM D4792 (12) outline recommended properties of steel slag aggregate for use in hot mix asphalt. Some agencies, such as the ...
Aug 29, 2019· The fresh and hardened properties of sodium hydroxide activated binary blends of slag and fly ash based geopolymer paste and mortars are reported in this paper. Experimental outcomes on fresh and hardened properties such as normal consistency, flow value, setting time, drying shrinkage, soundness, and compressive strengths of the geopolymer ...
MATERIAL PROPERTIES Physical Properties Steel slag aggregates are highly angular in shape and have rough surface texture. They have high bulk specific gravity and moderate water absorption (less than 3 percent). Table 1 lists some typical physical properties of steel slag. Table 1. Typical physical properties of steel slag.
Strength gain is not only an inherently important property, but it also indicates the quality of the overall cement matrix. Using slag cement as a replacement material for OPC changes the rate of strength gain because the hydration properties of slag cement are different from OPC. Slag cement is a latent hydraulic material, meaning that with use of
The same properties that help ferrous slag neutralize acids (its high calcium content), may help slag absorb the excess phosphate from the water. With excess phosphate in water being a significant issue in the Chicago-Gary area, this benefit from slag could be another use for the material and could decrease the need to mine new natural ...
Slag generation is highly dependent on specific processes and sources; consequently, slag properties can vary between plants and different ore sources, and must be investigated on a case-by-case basis. Most of the molten nonferrous slag that is produced is dumped into a pit and simply allowed to air cool, solidifying under ambient conditions. ...
In this regard, reactivity, mechanical properties and the durability of the studied mixtures were tested. Furthermore, when slag is used for alkali-silica reactivity (ASR) mitigation, a 50% slag cement is is typically recommended. However, such high cement replacement by slag is …
Slag generally consist of various properties like they remove waste in metal smelting, assist in controlling the temperature of smelting and minimizing re-oxidation of the final liquid metal product before the molten metal is removed from the furnace and used to make solid metal.
Properties And Effects Of Copper Slag In Concrete 47 2.7 Fineness Modulus The fineness modulus of coarse aggregates (20 mm & 10 mm), sand and copper slag are 7.10, 6.77, 2.94 and 4.06 respectively. Table 3.2 to 3.3 shows the fineness modulus of 20 mm, 10 mm coarse aggregates, sand and copper slag …
furnace slag which is defined as 'vitrified slag material made by rapid cooling of slag melt of suitable composition, obtained by smelting iron ore in a blast furnace, consisting of at least two-thirds by mass of glassy slag, and possessing hydraulic properties when …
The effect of styrene-acrylate (SA) polymer latex on alkali-activated slag (AAS) was systematically studied in the aspects of hydration, hydration products, pore structure and mechanical properties through the combined analytical techniques including calorimetry, X-ray diffraction, thermogravimetric analysis, mercury intrusion porosimetry, and mechanical measurement.
Chemically, slag is a mixture of lime, silica and alumina, that is, the same oxides that make up Portland cement. Cementitious properties are generated when ground granulated slag reacts with water. Using slag cement to replace a portion of Portland cement in a concrete mixture is an efficient way to make concrete more consistent.
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