slag in concrete Topic
Slag in Concrete. Definition: granulated blast-furnace slag that has been finely ground and that is hydraulic cement.- ACI Concrete Terminology. The use of slag …
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Setting Time, Workability and Strength Properties of Alkali
The method used was the same as the method used to determine initial and final setting time of cement. ... Pratt PL (1995) Alkali-activated slag cement and concrete: a review of properties and problems. AdvCem Res 27:93–102 ... (2001) Effect of granulated blast furnace slag on geopolymerisation. In: proceedings of 6th world congress of ...
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Stages of Hydration
Systems containing slag cement and fly ash are reportedly more prone to frost damage. Low-calcium fly ash and slag cement are effective in reducing alkali reactivity of mixtures for three reasons: • Mixture's alkali content • Concrete permeability • System's calcium/silica ratio High-calcium fly ashes may have the same effect, and they
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Frontiers | Effect of Iron Tailings and Slag Powders on Workability …
The results showed that the proper addition of iron tailing powder is beneficial to the working performance of concrete and can effectively reduce the time-loss of concrete fluidity. When the content of iron tailings powder in the composite admixture is 50%, the 1080d long age strength of C30 and C50 concrete can reach 50.3 and 80.7 MPa.
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Slag Cement
The setting time of concrete containing slag cement is commonly retarded. ... The effect of slag content on the other properties of some slag cements with ... has an almost linear relationship with the proportion of slag in the cement. Based on a set of reference samples containing slag from the same source as in the cement and ensuring that ...
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Evaluate and Predict the Resist Electric Current and
The modeling technique evaluated the curing period (3–90 days), cement content (92–469.8 kg/m 3), water-to-cement ratio (0.3–0.75), fine aggregate (620–773.3 kg/m 3), and steel slag content (0–365 kg/m 3) as the most important factors that affect the CS and ER of concrete with steel slag substitution. According to published data from ...
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Effect of Lithium-Slag in the Performance of Slag Cement Mortar …
Two industrial wastes, lithium-slag and slag, were added to cement mortar, and the role of lithium-slag was to activate slag. In addition, to save economic and time costs, this paper also used the least-squares support vector machine (LS-SVM) method to predict the property changes of cementitious-based materials.
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Q&A: Mitigating Scaling Effects on Concrete When Using Slag …
Slag cement will slow the set time of concrete to a greater degree than straight portland cement mixtures. The amount of slag cement used as a replacement for portland cement is usually decreased or eliminated in cold weather to provide a faster setting concrete.
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Initial Setting Time
High alumina cement is slow setting cement. Its initial setting time is 4–5 h and final setting time is about 30 min later after initial setting. No additives should be used because the setting time of high alumina cement is greatly affected by the addition of plaster, lime, Portland cement, and organic matter.
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Slag Cement
Slag Cement. A centuries-old material evolves to meet the demands of modern construction. Slag cement, a byproduct of steel-making, enhances the traditional concrete benefits of strength and durability while offering reductions in waste, energy use and greenhouse gas emissions. Slag cement is used in concrete for virtually any …
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Slag Cement and Concrete Pavements
Slag cement—commonly referred to as ground granulated blast-furnace slag, or GGBFS— is a hydraulic cement that works synergistically with portland cement to improve the strength and durability of concrete pavements. Slag is a byproduct of processing iron ore to iron and steel in a blast furnace. Molten slag, which floats on the top of the ...
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Effect of curing time on granulated blast-furnace slag cement …
Set an upper limit for ground granulated blast-furnace slag content in cement-based materials based on their carbonation resistance useful for material engineers. 2. Set a minimum period of wet curing valid for real reinforced concrete structures useful when civil engineers consider the wet curing time in building structures.
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Slag Substitution as a Cementing Material in Concrete: …
Cement is replaced by slag from different steel mills, both blast furnace and ladle furnace slag. The percentages of slag substitution by cement are 30%, 40% and 50% by weight. Mechanical, physical and environmental properties have been evaluated. Compressive and flexural strength have been analysed as the main mechanical properties.
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Effects of Slag Cement on Strength and Durability of Concrete
Section 430-Portland Cement Concrete Pavement. If high early strengths are not desired, use granulated slag as a partial replacement for Portland cement in concrete. Follow …
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Analysis of the Optimum Usage of Slag for the Compressive …
Ground granulated blast furnace slag is widely used as a mineral admixture to replace partial Portland cement in the concrete industry. As the amount of slag increases, the late-age compressive strength of concrete mixtures increases. However, after an optimum point, any further increase in slag does not improve the late-age …
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233R-17: Guide to the Use of Slag Cement in Concrete and …
The use of slag cement as a cementitious material dates back to 1774, when a mortar was made using slag cement in combination with slaked lime (Mather 1957). In 1862, a …
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ACI Education Bulletin E3-13
6.3—Effect of fly ash on fresh concrete, p. E3-19 6.4—Effect of fly ash on hardened concrete, p. E3-20 6.5—Concrete mixture considerations with fly ash, p. E3-21 CHAPTER 7—SLAG CEMENT, p. E3-22 7.1—Classification of blast-furnace slag, p. E3-22 ACI Education Bulletin E3-13 CEMENTITIOUS MATERIALS FOR CONCRETE
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Slag Cement
The setting time of concrete containing slag cement is commonly retarded. The extent of the delay is influenced by several factors such as the curing temperature, slag cement …
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Understanding the roles of activators towards setting and …
The optimum cement paste mix (80% steel slag and 20% cement, with 0.1 mol/L EDTA solution) achieved maximum compressive strength of 14 MPa and CO 2 uptake of 8.7% after 28 days of accelerated carbonation. Results demonstrated that the use of high-volume steel slag as a cementitious material has great potential in non-structural building ...
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Controlling concrete setting times | GCP Applied Technologies
Drill shaft concrete – Typically, concrete for drill shafts must be able to maintain a minimum slump of 4" for the duration of the placement (typically from 2 to 12 hours). For one bridge project in South Carolina, the land-based drill shafts had a dosage rate ranging from 4 to 10 ounces per 100 pounds of cement, with a slump life is 4 to 8 ...
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Effect of Expansive Agent and Temperature on the Quality of
Pre-cast concrete products are sometimes manufactured in two cycles per day production with one mold for the purpose of productivity improvement. In such cases, to secure the early strength, which is required at demolding, it is necessary to increase the steam-curing temperature. However, when this is done, the issue of temperature-related …
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Slag Cement and Concrete Pavements
Slag cement—commonly referred to as ground granulated blast-furnace slag, or GGBFS— is a hydraulic cement that works synergistically with portland cement to improve the …
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Effect of admixtures on the setting times of high-strength concrete
The general effect of SF, MK, FA and GGBS is to retard the setting times of high-strength concrete. 3. The SRA has negligible effect on the setting times of normal strength concrete, but it has a significant retarding effect when used in combination with a superplasticiser in high-strength concrete. 4.
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Steel slag and its applications in cement and concrete …
Highlights • Current applications of steel slag in concrete were presented. • Its chemical composition and durability properties of steel slag in literature were …
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The potential of one-part alkali-activated materials (AAMs) as a
The superplasticizer (SP) effect on one-part alkali-activated slag mortar was studied by Luukkonen et al. 14 and found that the lignosulfonate-based superplasticizer was the most suitable retarder ...
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The Properties of Slag Cement and its Influence on …
Finely, the use of slag in cement improves resistance to aggressive chemicals [2]. Due to the pozzolanic properties, Slag interacts with the Ca (OH)2 to form an additional amount of a low-basic ...
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Influence of cement fineness and water-to-cement ratio on mortar …
Set time of concrete is important in concrete construction since it directly relates to the timing of different processes of placing and finishing concrete. ... While effects of cement fineness and w/c on cement hydration has been ... Early-age hydration and mechanical properties of high volume slag and fly ash concrete at different curing ...
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National Concrete Pavement Technology Center
Slag cement reacts slowly in the presence of water alone or more vigorously when activated in water in the presence of alkali hydroxides. This latter condition characterizes the pore solution of hydrating portland cement and, thus, the two cements react in a complementary manner. Characteristic impacts of using slag cement in concrete are as ...
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CONCRETE 101
Lightweight concrete is made using lightweight aggregates of expanded shale, clay and slag. These are used to produce structural lightweight concrete with a freshly mixed unit weight of 90 to 120 pounds per cubic foot. Normal weight concrete is typically 135 to 150 pounds per cubic foot. Lightweight aggregate is porous with absorption values of ...
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Performance of Slag Cement with Portland‐limestone …
March 31, 2021. ACI Virtual Meeting Doug Hooton UNIVERSITY OF TORONTO Concrete is a Sustainable Material Concrete has the lowest embodied carbon and energy footprint of …
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