325) sieve shall not exceed 20 percent. The ASTM C989 slag-activity index is often used as a basic criterion for evaluating the relative cementitious potential of slag cements. Steel slag is a potential mineral admixture for cement or concrete production (Shi, 2004). Blast-furnace slag: Grade 120 has a high activity index and is more cementitious than OPC. ASTM C 989 (AASHTO M 302) classifies slag by its increasing level of reactivity as Grade 80, 100, or 120 (Table 3-1). Hou je stappen, kilometers en aantal uren slaap bij. Grade80 has a low activity index and is used primarily in mass structures becauseit generates less heat than portland cement. From a metallurgical standpoint, slag can be sorted as either basic or acidic, and the more basic of slag, the greater its hydraulic activity in the presence of alkaline activators, Lea also reported that the hydraulic values of slag increase with the increasing CaO/SiO 2 ratio up to a limiting value (not precisely stated). Grade 100 must obtain an SAI of more than 70% at 7 days and 90% at 28 days. To submit an update or takedown request for this paper, please submit an Update/Correction/Removal For grade 120, SAI shall be less than 90% at 7 days and 110% at 28 days. SAI = slag-activity index, % SP = average compressive strength of slag-reference cement mortar cubes, psi P = average compressive strength of reference cement mortar cubes, psi Grades are determined when the mortar cube sample’s SAI falls within the allowed ranges of the following table. The fly ashes in the 1976 study were evaluated based on Federal Specification SS -P-570B. How slag impacts fresh concrete. Type C Fly Ash: 33.5. read more... Total Construction Material & Solutions. Slag activity index, which is defined as similar to the SAI, only differs by 50% replacement of slag . Although the alkalinity determines the types of major minerals of steel slag, it does not determine the contents of these minerals. This paper presents the experimental results of the fineness effect on the pozzolanic activity of Cu-Ni slag in cemented tailing backfill. The results show that the SAI of slag is more than 100% for both 7 and 28 days. Physical properties of the slag shall be in accordance with the requirements for fineness as determined by air permeability and air content, slag activity index, and compressive strength. The molten slag then goes through a particular process depending on what type of slag it will become. In Australia slag is standardised in AS 3582.2:2016. The slag activity index (SAI) of mortar using GGBF slag to replace PC at a rate of 50% by weight of the binder will not be less than 75% of the strength of the PC mortar at 28 days for grade 80. The compressive strength of the mortar was determined according to ASTM C109 . SCA Board Member Login SCA Technical Marketing Committee Login Type C Fly Ash: 33.5. read more... Total Construction Material & Solutions. Slags are classified into three grades (80, 100, and 120) based on their respective mortar strengths when blended with an equal mass of portland cement (ASTM C989). Discover the world's research. Granulated blast-furnace slag: The glassy, granular material formed when molten blast-furnace slag is rapidly chilled as by immersion in water. The activity index (AI = (SiO2 + Al2O3)/(FeO + Fe2O3 + MgO + MnO)) was defined to evaluate the hydration activity of steel slag, which was verified to be effective by the results of examples. 1) - to spit. Blast furnace slag is defined as “the non-metallic product consisting essentially of calcium silicates and other bases that is developed in a molten condition simultaneously with iron in a blast furnace. Discover our research outputs and cite our work. INVESTIGATION OF HYDRAULIC ACTIVITY OF GROUND GRANULATED BLAST FURNACE SLAG IN CONCRETE. Slag is primarily used in the cement and … Ground Granulated Blast Furnace Slag (GGBFS) is a by product of the steel industry. The tests also included the evaluation of SC setting time and slag activity index. As a measure of activity, we have used an index describing the average deviation of the horizontal field component from its normal value. 2) - a woman whom sleeps around, looks cheap &/or has questionable character. Mechanical test and microstructural analyses are performed. Pozzolanic activity may be directly determined by measuring the amount of reacted lime, using the technique of thermogravimetry analysis and differential thermal analysis (DTA). Copper slag based pastes had good volume stability. For grade 120, SAI shall be less than 90% at 7 days and 110% at 28 days. Welkom Welkom bij het puzzelwoordenboek waar je wat van opsteekt! 1. ... GGBS (Ground Granulated Blast-furnace Slag) is a cementitious material whose main use is in concrete and is a by-product from the blast-furnaces used to make iron. Ground granulated blast-furnace slag (GGBFS), sometimes simply referred to as “slag”, is a glassy granular material formed when molten blast-furnace slag is rapidly chilled, as by immersion in water. In 1976 2 this author publi shed his first research report on the use of fly ash in concrete while working at the U.S. Bureau of Reclamation Laboratory in Denver, Colorado. 102 Restrictions are placed on LOI (3.0%), insoluble residue (2.0%), sulfur (1.5%), MgO (15.0%), Al 2 O 3 (18.0%), FeO (1.5%) and MnO (2.0%). Typically the air-cooled slags have a slag activity index by ASTM C989 of 40 to 50 at 7 days, and 50 to 60 at 28 days and are thus considered low grade slags not even meeting grade 80 of ASTM C989. The activity index of steel slag-GGBS composite mineral admixture with different steel slag contents at the W/B of 0.3, 0.4, and 0.5 was investigated. The results show that the activity index of the composite mineral admixture with higher GGBS content is larger, and this phenomenon is … Slag - Manufacture Iron Blast Furnace Iron ore is layered with a mixture of limestone and coal or coke. To improve the properties of ground granulated blast furnace slag (GGBS) and utilize ground granulated blast furnace slag efficiently, this study investigates the effect of fineness on the hydration activity index (HAI) of ground granulated blast furnace slag. To improve the properties of ground granulated blast furnace slag (GGBS) and utilize ground granulated blast furnace slag efficiently, this study investigates the effect of fineness on the hydration activity index (HAI) of ground granulated blast furnace slag. It is a non-metallic product, consisting of silicates and aluminosilicates of calcium and other bases, developed in a molten condition simultaneously with iron in a blast furnace. Grade 100 must obtain an SAI of more than 70% at 7 days and 90% at 28 days. When the iron ore, which is made up of iron oxides, silica, and alumina, comes together with the fluxing agents, molten slag and iron are produced. Slag-activity Index. The activity index (AI = (SiO 2 + Al 2 O 3 )/ (FeO + Fe 2 O 3 + MgO + MnO)) was defined to evaluate the hydration activity of steel slag, which was verified to be effective by the results of examples. The SAI of the materials was determined and the results are presented in Table 3. The results show that the activity index of the composite mineral admixture with higher GGBS content is larger, and this phenomenon is more obvious at later ages. 3) - the waste product of the steel making process. 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