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Blast furnace slag is allowed to slowly cool by ambient air, is processed through a screening and crushing plant and is processed into many sizes for use primarily as a construction aggregate. Common uses are as aggregates in readymix concrete, precast concrete, hot mix asphalt aggregate, septic drain fields and pipe backfill.
Nov 25, 2018· Aircooled slag uses are many and varied, including all types of construction aggregate applications in addition to manufacture of mineral wool, cement and glass and as a soil conditioner. The principal uses of air cooled slag include road bases, asphalt concrete aggregate, concrete aggregate, structural fill, railroad ballast, and mineral wool.
performance of concrete pavements that incorporate this material. Introduction. Aircooled blast furnace slag (ACBFS) has been used as a coarse aggregate in concrete pavements since at least the 1930s. The States of Michigan, Pennsylvania, New York, Indiana, and Ohio, among others, have had considerable experience with ACBFS in concrete pavement
Use of Aircooled Blast Furnace Slag as Coarse Aggregate in Concrete Pavements. This report presents available information regarding the use of aircooled blast furnace slag (ACBFS) as coarse aggregate in concrete pavements. The report discusses ACBFS aggregate production and properties, and the properties of concrete produced with ACBFS coarse ...
To obtain a good slag reactivity or hydraulicity, the slag melt needs to be rapidly cooled or quenched below 800 °C in order to prevent the crystallization of merwinite and melilite. To cool and fragment the slag a granulation process can be applied in which molten slag is subjected to jet streams of water or air .
Use of Steel Slag Aggregate in Pavements . ... It is not used in cement concrete pavements or other concrete applications due to the expansive nature of the aggregates since expansion causes the concrete to crack. All users specify that the aggregate be cured in a water ... * AirCooled Blast Furnace Slag. ** Basic Oxygen Furnace
Ramachandran et al. [9] Stated that aircooled . slag is suitable as an aggregate in concrete. Also, slag . ... the volume stability of steel slag concrete was best. But when the content of steel ...
aggregate in concrete and water cooled granulated slag is used as a partial substitution for sand in concrete. Reports show that air cooled ferrochrome slag has gained popularity as a coarse aggregate in concrete. But the use of water cooled rochrome slag .
Iron making and Steelmaking slags are products of the steel making process. Once stockpiled as low value byproducts, they are now accepted and often preferred and specified as a valuable raw material with many end uses. AirCooled Blast Furnace Slag
Pelletized blast furnace slag, in contrast to aircooled and expanded blast furnace slag, has a relatively smooth texture and rounded shape. Grinding reduces the particle size to a cement fineness for use as a hydraulic cement, which is typically less than 3500 cm 2 /g. (8)
Provide coarse aggregate for asphalt concrete base used in flexible pavements consisting of CCS, gravel, or crushed aircooled slag. Provide fine aggregate for asphalt concrete base consisting of natural sand or sand manufactured from stone, gravel, or aircooled slag. B. Physical properties.
If the liquid slag is aircooled under ambient conditions, a crystalline material is formed and a hard piece is produced that can then be crushed and separated as an aircooled blast furnace slag aggregate [3]. The physical appearance of the aircooled slag aggregate appears suitable for use in concrete .
Sep 30, 2019· 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: Blastfurnace 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 : Aircooled blast furnace slag (ABS) What is ABS? ABS is a crystalline byproduct produced by the solidification of molten blastfurnace slag. Production and Processing. Iron production is via a continuous batch process with the iron and slag produced in .
The pressure method of determining air content cannot be used on concrete containing the following types of aggregate: lightweight, aircooled blast furnace slag, aggregates of high porosity. What is the min. allowable capacity of the measuring bowl used in this test method?
Slag Usage • Slag aggregates are approved for a number of uses although there are restrictions. • Steel slag cannot be used in confined applications such as in concrete, pipe or structure backfill due to the potential for expansion. • Blast furnace slag may be used in concrete. • Both types of slags may be used as subbase material • Concerns with past performance when used as ...
Three general types of slag are produced, known to the trade as aircooled, granulated, and lightweight. Aircooled The bulk of the slag used today as aggregates is of the aircooled variety. This is a form of slowly cooled slag. Many of the physical properties of solidified slag depend on the manner in which the molten material is cooled.
This is the coproduct from the reduction of iron ores to produce molten iron and molten slag. 1. When allowed to cool slowly to a crystalline rod< form It becomes a light gray vesicular rock known as AirCooled Blast Furnace Slag. Principle uses include:
This report presents available information regarding the use of aircooled blast furnace slag (ACBFS) as coarse aggregate in concrete pavements. The report discusses ACBFS aggregate production and properties, and the properties of concrete produced with ACBFS coarse aggregate. Both the .
Resources are depleting day by day due to non consumptive use by the mankind. Blast furnace slag has a great potential as it can be used as an artificial aggregate. Keeping this in view, the present study the present study encourages the utilization of waste material such as air cooled blast furnace slag (ACBFS) and fly ash in concrete.
Aircooled blastfurnace slag: The material resulting from the solidification of molten blastfurnace slag under atmospheric conditions. Subsequent cooling may be accelerated by application of water to the solidified surface. (This material can be mined and crushed for use as aggregates in concrete or fill material; it is not cementitious).
Concrete with aircooled blastfurnace slag indicated higher pumping pressure than that with crushed stone due to pressure absorption, while no significant change was found for granulated blastfurnace slag concrete. It is concluded that blastfurnace slag aggregate concrete is pumpable without significant slumploss when such aggregate does ...
There is no risk of alkaliaggregate reaction, and this slag contains no clay or organic impurities. As a result, it is also used as a concrete aggregate in the same way as natural aggregate. Granulated blast furnace slag Just like aircooled blast furnace slag, this slag has a hydraulic property and there is no risk of alkaliaggregate reaction.
If highearly strengths are unnecessary, the Contractor may use granulated iron blastfurnace slag as a partial replacement for Portland cement in concrete if the following limits are met: a. Replace no more than 50 percent of the cement by weight. b. Replace the cement with slag at the rate of lb ( kg) of slag to lb of cement.
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