Showing papers on "Ground granulated blast-furnace slag published in 1993"

Drilling and cementing with blast furnace slag/silicate fluid

Abstract: A drilling and cementing operation is carried out utilizing a universal fluid comprising blast furnace slag, water, a silicate and a retarder, the components of the drilling fluid being chosen so as to have a dual functionality in promoting the drilling fluid and thereafter in being functional constituents of a cementitious slurry.

Fly Ash, Slag, Silica Fume, and Rice Husk Ash in Concrete: A Review

Abstract: Environmental problems associated with waste product disposal, resource conservation considerations, and the cost of portland cement will demand the increasing use of of fly ash, slag, condensed silica fume and rice-husk ash in the production of cement and ready-mixed and precast concretes. This article discusses this issue, the properties and limitations of these materials, and the effects that this will have on concrete properties. It is noted that North American trends indicate preference for the separate batching of these materials at concrete-batching plants rather than the intergrinding with portland cement clinker at a cement plant. This, however, is not advised in developing countries. It is also noted that recent developments in chemical admixtures, especially the introduction of superplasticizers, will increasingly facilitate the incorporation of supplementary cementing materials in concrete. Technology transfer needs are also noted.

Drilling and cementing with blast furnace slag/soluble/insoluble alcohol

Abstract: A composition suitable for drilling and cementing comprising blast furnace slag, water, a soluble polyalcohol and an insoluble polyalcohol, the components of the drilling fluid being chosen so as to have a dual functionality in promoting the drilling fluid and thereafter in being functional constituents of a cementitious slurry.

Drilling and cementing with blast furnace slag/polyalcohol fluid

Abstract: A drilling and cementing operation is carried out utilizing a universal fluid comprising blast furnace slag, water and a polyalcohol, the components of the drilling fluid being chosen so as to have a dual functionality in promoting the drilling fluid and thereafter in being functional constituents of a cementitious slurry.

Immobilization Science of Cement Systems

Abstract: Portland cement and Ca(OH)2, “slaked lime,” are representative of a family of materials that have conceptual and practical advantages as matrices for the immobilization of wastes. These are relatively proven construction materials with an extensive history of use in various ground-water regimes, and in various climates. The raw materials are widely available and they exhibit a reasonable amount of resistance to physical damage and attrition. They are also durable. Although modern Portland cements are only about 150 years old, numerous examples of Roman concrete made from slaked lime and volcanic pozzolanic ash survive; the Pantheon in Rome (circa A.D. 300) continues in regular use.Satisfactory immobilization matrices can also be formed by incorporating other artificial waste materials, e.g. coal combustion fly ash, blast furnace slag, and natural materials such as calcined kaolin or siliceous volcanic ashes containing glass and zeolites. These materials react with Ca(OH)2 and cement to become an integral part of a cement matrix. Thus one waste (ash, slag) can be used to help immobilize another, and may actually improve the retentive capacity of a cementitious matrix.Since cements require water to harden, they are tolerant of wet wastes and are especially useful for many effluents. In addition, they are low-cost, nonflammable materials with the potential to provide chemical and physical immobilization of wastes, but their set characteristics can be affected by certain material additions. Table I balances some advantages against disadvantages of the use of cement systems for waste immobilization.

Blast furnace slag transition fluid

Abstract: In a drilling and cementing operation utilizing a lead cementitious slurry made from blast furnace slag and drilling fluid, a lower density transition fluid is utilized between said lead cementitious slurry and a tail Portland cement slurry. In one embodiment, the lead cementitious slurry and the transition fluid slurry are made by introducing blast furnace slag into a flowing stream of drilling fluid.

Prediction of Long-Term Corrosion Resistance of Plain and Blended Cement concretes

Abstract: This investigation evaluated the relationship between the early age properties, such as compressive strength, pulse velocity, porosity, and permeability, and the long-term corrosion resistance of plain, fly ash, pozzolanic, and blast furnace slag cement concretes. The details of the study are described. The data that was developed were statistically analyzed to establish relationships bestween the long-term corrosion rate and the early age properties of plain and blended cement concretes. The results of regression analyses indicate excellent correlation between permeability and corrosion rate, and porosity and corrosion rate for both plain and blended cement concretes.

Optimizing blast furnace slag cements

Abstract: A method and composition for cementing a well by combining water, blast furnace slag and trisodium phosphate to form a cement slurry, displacing the cement slurry into the well and allowing the cement slurry to set.

Curing and the durability of OPC, fly ash and blast-furnace slag concretes

Abstract: This paper presents preliminary results of a research project into the influence of moist curing on the potential durability of concrete. Durability is characterized by measuring the oxygen permeability and water absorption at various depths in the covercrete. Concretes containing plain OPC, an OPC-FA blend and an OPC-GGBS blend were used. A range of strength grades was tested for each of these binder types. Concretes were exposed to moist curing conditions for 1, 3, 7 and 28 days before being tested at 28 days after casting. The main conclusions are: (i) moist curing has a marked influence on the potential durability of concrete and (ii) a relatively greater influence on durability can be effected by extending the duration of early-age moist curing rather than decreasing the binder/water ratio.

Method for drilling and cementing a well.

Abstract: A cementitious slurry containing blast furnace slag and a surfactant is utilized to displace an oil based drilling fluid without causing contamination by the blast furnace slag cement. In a specific embodiment, a cementitious slurry comprising blast furnace slag, a surfactant and water is used in the cementing of an annulus surrounding a casing or liner wherein a synthetic oil-containing drilling fluid is present.

Cement composition and method for the preparation thereof

Abstract: The invention relates to a cement composition which can be hardened hydraulically and which consists of ground cement clinker material, granulated blast furnace slags and comminuted steel slags. The comminution of the steel slags is preferably carried out by grinding, in particular to a particle size of at most 0.2 mm and expediently to 0.09 mm. The ground steel slags have a Blaine value of at least 400 m²/kg, expediently 473 m²/kg, and a weight per unit volume of 2,800-4,000 kg/m³. The steel slags are chosen from air-cooled steel slags, foamed steel slags, granulated steel slags or a combination thereof. A method is also described for the preparation of a cement composition which can be hardened hydraulically, in which method cement clinker material and ground, granulated blast furnace slags are mixed with ground steel slags at normal or elevated temperature and pressure, the obtained mixture is cooled if desired, and comminuted to obtain a hydraulically hardenable cement composition. Use is made of a cement furnace if the present cement composition is prepared at an elevated temperature. Preferably a mixture of blast furnace slag cement and ground steel slags containing up to 30% of steel slags, or a mixture of Portland cement and ground steel slags containing up to 50% of steel slags is formed.

Well drilling cuttings disposal

Abstract: Well cuttings are disposed of by solidification by combining the cuttings with water and blast furnace slag, and injection of the cuttings, water and slag into an annulus surrounding a wellbore casing and solidifying the cuttings, water and slag. Solidification in blast furnace slag cement is inexpensive, and the blast furnace slag is compatible with both oil and water based drilling muds. Drilling fluids therefore do not have to be removed from the drilling cuttings prior to solidification in the wellbore annulus.

High temperature well cementing with low grade blast furnace slag

Abstract: Drilling fluid is solidified by the incorporation therein of low grade blast furnace slag In a preferred embodiment lime is also incorporated into said drilling fluid and/or said drilling fluid is a lime drilling fluid Thus, there is provided a cementitious composition comprising drilling fluid, low grade blast furnace slag and, generally, lime Also provided is a drilling and cementing process wherein a cementitious slurry comprising low grade blast furnace slag is introduced into a wellbore to cement a casing or liner

Process and system for producing cementitious materials from ferrous blast furnace slags

Abstract: Processes and systems for producing cementitious materials from ferrous blast furnace slags. Processes comprise mixing of a source of CaO with molten slag flowing from at least one slag tap hole of a blast furnace. Sufficient CaO is mixed with the molten slag to raise the ratio of CaO to SiO2, the C/S Ratio, of the slag to between about 64 1.06 and 1.25, while maintaining the Base Number of the molten slag less than about 1.55. The slag is then water granulated and ground to a predetermined degree of fineness. An activator then is added to the ground granulated slag. The C/S Ratio of the granulated slag determines the degree of fineness to which the granulated slag must be ground to achieve a desired hydration rate in the resultant cementitious material. Cementitious materials with C/S Ratios in this range may be ground less finely, yet possess the same hydration rates, as other more finely ground cementitious materials.

Development of mix designs for strength and durability of steam-cured concrete

Abstract: The importance of concrete strength and durability for the satisfactory performance of concrete is noted, and the article describes a study of the optimization of mix designs for concretes subjected to an 18-hour steam curing regime. In all cases, the water-to-cementitious-materials ratio was 0.45, the maximum allowed for a Class A exposure. The details of the materials and mix designs, curing, chloride ion penetration and compressive strength findings are presented. The test results indicated that concretes with such a water/cement ratio can perform very differently, particularly in their resistance to chloride ion intrusion. In the case of steam-cured concretes, silica fume and slag can be used to improve strength and durability. These and other findings are discussed.

Oil mud displacement with blast furnace slag/surfactant

Abstract: A cementitious slurry containing blast furnace slag and a surfactant is utilized to displace an oil based drilling fluid without causing contamination by the blast furnace slag cement. In a specific embodiment, a cementitious slurry comprising blast furnace slag, a surfactant and water is used in the cementing of an annulus surrounding a casing or liner wherein a synthetic oil-containing drilling fluid is present.

Block for paving and production thereof

Abstract: PURPOSE:To obtain a cement-based block for paving, having a high surface hardness and excellent in abrasion, discoloring and cracking resistances and provide a method for producing the block. CONSTITUTION:This block for paving is obtained by superposing the first layer 3 obtained by kneading a binder prepared by mixing one or two or more materials such as a calcium-based cement material, slaked lime or granulated blast furnace stag with a coarse aggregate (2a) and water on the second layer 4 obtained by kneading a binder prepared by mixing one or two or more materials such as the calcium-based cement material, slaked lime or granulated blast furnace slag with a fine aggregate (2b), a pigment and water, forming the resultant superposed layers into a formed body of a prescribed shape, then exposing the formed body into a gaseous carbon dioxide atmosphere within 72hr, carbonating and curing the formed body and forming a carbonated hard layer 5 on the surface side of the formed body 1.

Method for recovering iron content in steelmaking slag

Abstract: PURPOSE: To efficiently recycle the iron content in a steelmaking slag in a low cost by utilizing slag rapid cooling process by spraying water in a closed pressure vessel, as for the recycling method by recovering the iron content in the steelmaking slag. CONSTITUTION: By allowing a molten steelmaking slag to flow into a slag pan, etc., the slag is solidified and made to be roughly crushed as slag block at high temp. by mechanical stroke. With the steam generated by spraying the water in the closed pressure vessel from the upper part, the inner part of the pressure vessel is held to the relation of the stream pressure P and the treating time T in a range 3.50≥P 0.6 ×T 0.4 ≥1.48, P≤15, T≤1. By rapid cooling with the cooling water and slag expansion with hydration, the roughly crushed slag is further crushed to change into fine granulated slag. Electromagnetic separation is executed to this slag, and the iron content is recovered as the rough concentration, and if necessary, after adding the cycle of grinding + electromagnetic separation, the iron content is made to recycle as raw material for iron-making or steelmaking. COPYRIGHT: (C)1994,JPO&Japio

Revert briquettes for iron making blast furnace

Abstract: An iron making blast furnace revert briquette composition including finishing mill scale, steelmaking slag, blast furnace dust and a binder wherein the binder includes Portland cement, granulated blast furnace slag cement or mixtures thereof and bentonite The bentonite improves the cold and hot strength of the briquette

Anti gas-migration cementing

Abstract: A casing or liner in a wellbore penetrating a zone having high formation gas pressure is cemented with a cementitious slurry comprising blast furnace slag. In one embodiment the cementitious slurry is made by combining blast furnace slag and a drilling fluid. Also, a method for plugging or setting sidetracking plugs and other secondary cementing operations in a wellbore penetrating a zone having high gas formation pressure comprising placing a mass of blast furnace slag cementitious slurry at a preselected location and allowing the slurry to set.

Production of slag-based base course material

Abstract: PURPOSE:To obtain a base course material based on steelmaking slag. CONSTITUTION:A process for producing a base course material based on steelmaking slag, comprising adjusting the basicity (CaO/SiO2) to 2.0-5.0 by a weight ratio in the manufacture of steel iron, adding fluorite and/or calcium chloride to the mixture, cooling the mixture, spontaneously aging this mixture under an atmospheric pressure, crushing the cooled slag, adjusting the particle size of the crushed particles, and forcibly aging these particles by blowing steam into them under an atmospheric pressure. In this process, the spontaneous aging may be preceded by the crushing and the particle size adjustment. The base course material produced by either of these processes may be mixed with blast furnace slag and/or waste concrete to produce a mixed slag-based base course material. Thus, the base course materials can be produced at good efficiency within a short time from steelmaking slag.