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Provide coarse aggregate for asphalt concrete base used in flexible pavements consisting of CCS, gravel, or crushed air-cooled slag. Provide fine aggregate for asphalt concrete base consisting of natural sand or sand manufactured from stone, gravel, or air-cooled slag. B. Physical properties.
Iron Blast Furnace Slag (BFS) This is the co-product 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 Air-Cooled Blast Furnace Slag. Principle uses include:
Nov 25, 2018· Air-cooled 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.
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 ready-mix concrete, precast concrete, hot mix asphalt aggregate, septic drain fields and pipe backfill.
From this and the added fluxing agents molten slag and iron are formed. The physical characteristics such as density, porosity, and particle size, are affected by the cooling rates and chemical composition. Depending on the cooling method, three types of iron slag are produced— air cooled, expanded, and granulated— that have different types ...
1) As seen in Fig. 1, BF slag is divided into air-cooled slag and granulated slag. The former is produced by letting molten slag cool in open pits or yards, and the latter by rapidly cooling mol-ten slag with water jet; the former looks like crushed stone and the latter like sand. Coarse aggregate of BF slag for concrete mixing is
performance of concrete pavements that incorporate this material. Introduction. Air-cooled blast furnace slag (ACBFS) has been used as a coarse ag-gregate 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
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.
Use of Air-Cooled Blast Furnace Slag as Coarse Aggregate in Concrete Pavements—A Guide to Best Practice. This document contains recommendations for best practices related to the use of air-cooled blast furnace slag (ACBFS) as coarse aggregate in concrete pavements.
Air cooled slag is not cementitious. Pelletized or expanded slag results when molten slag is quickly cooled using water or steam. It produces a lightweight aggregate that can be used for concrete masonry, lightweight fill, or can be ground into a cementitious product.
The use of air-cooled blast furnace slag in the production of concrete can have economical motivations—acquiring ACBFS, as a waste that is industrially generated, is cheaper than obtaining natural aggregates from a quarry. Additionally, the reuse of air-cooled blast furnace slag has
This report presents available information regarding the use of air-cooled 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 .
Three general types of slag are produced, known to the trade as air-cooled, granulated, and lightweight. Air-cooled- The bulk of the slag used today as aggregates is of the air-cooled 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.
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 ...
Concrete with air-cooled blast-furnace slag indicated higher pumping pressure than that with crushed stone due to pressure absorption, while no significant change was found for granulated blast-furnace slag concrete. It is concluded that blast-furnace slag aggregate concrete is pumpable without significant slump-loss when such aggregate does ...
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 ... * Air-Cooled Blast Furnace Slag. ** Basic Oxygen Furnace
If high-early strengths are unnecessary, the Contractor may use granulated iron blast-furnace 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 1.0 lb (1.0 kg) of slag to 1.0 lb of cement.
Use of Air-cooled Blast Furnace Slag as Coarse Aggregate in Concrete Pavements. This report presents available information regarding the use of air-cooled 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 ...
This material is commonly called blast furnace rock slag, and it is a crystalline rock-like material that has little cementitious value and is essentially inert in concrete. Rock slag is suitable for use as aggregate in concrete, as per ASTM C33 (2013). Crushed air-cooled slag has been used as an aggregate in the manufacture of commercial ...
Pelletized blast furnace slag, in contrast to air-cooled 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)
This report presents available information regarding the use of air-cooled blast furnace slag (ACBFS) as coarse aggregate in concrete pavements. The report discusses ACBFS aggregate production and properties, and the properties of concrete produced w...
This is the co-product 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 Air-Cooled Blast Furnace Slag. Principle uses include:
There is no risk of alkali-aggregate 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 air-cooled blast furnace slag, this slag has a hydraulic property and there is no risk of alkali-aggregate reaction.
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