Mechanical test and microstructural analyses are performed. 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). The pozzolanic activity is a measure for the degree of reaction over time or the reaction rate between a pozzolan and Ca 2+ or calcium hydroxide (Ca(OH) 2) in the presence of water.The rate of the pozzolanic reaction is dependent on the intrinsic characteristics of the pozzolan such as the specific surface area, the chemical composition and the active phase content. Calcium silicate slag is a waste discharged during alumina extraction process from fly ash was investigated. similar. Slag Activity Index Min., percent Average of Last 5 2) - a woman whom sleeps around, looks cheap &/or has questionable character. 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. In Australia slag is standardised in AS 3582.2:2016. GGBFSis divided into three classifications based on its activity index. This figure tells the geomagnetic activity as observed from Tromsø (in the auroral zone) during the last 33 days. The ASTM C989 slag-activity index is often used as a basic criterion for evaluating the relative cementitious potential of slag cements. Slag is a byproduct of steel production and is similar in character to volcanic rocks such as basalt and granite. Discover the world's research. Slag activity index: 100%. Slag is primarily used in the cement and … 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. The three grades, 80, 100, and 120, are classified according to their slag activity index which is average compressive strength of the slag-reference cement cubes (SP), divided by the average compressive strength of the reference cement cubes (P), multiplied by 100 (see Table 1) 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. CORE is a not-for-profit service delivered by Ground granulated blast furnace slag (GGBFS) is designated in ASTM C989 and consists mainly of silicates and aluminosilicates of calcium. De Activity Tracker is een horloge met heel veel slimme functies. the Open University Slag Activity Index According to ASTM C989 [ 6 ], GGBF slag has 3 grades that depend on the mortar strength, i.e., grade 80, 100, and 120. HOME > Association Activities The purpose of Nippon Slag Association is promoting a broad understanding of iron and steel slag products among consumer industries, governments, academic associations, and working for effective use of these products. Geomagnetic Activity Index, Tromsø. Effect of the dosage of high-calcium fly ash and fineness of phosphorous slag powders on activity index of phosphorous slag powders was explored. Copper slag presented a potential application in mortars and concretes. 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. En ontvang pushmeldingen van sms'jes of Instagram berichten van je vrienden. The higher the activity index, the higher the hydration activity of the steel slag. 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 activity index is expressed as a percentage of the strength of the control sample. Activity Index) that is in the current ASTM C618 specification. The micrographs and pozzolanic activity showed that copper slag had stronger reactivity than fly ash. Ground Granulated Blast Furnace Slag (GGBFS) is a by product of the steel industry. 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. Compressive Strength machine Poking Rod , Petroleum Jelly Proving ring with all accessories suitable for calibration of CST machine Tachometer Cube Moulds 70.6 × … Slag Activity Index, min% Slag Activity Index, Consecutive Samples Any Individual Samples 7 day index Grade 80 Grade 100 Grade 120 — 75 95 — 70 90 28 day index Grade 80 Grade 100 Grade 120 75 95 115 70 90 110. Blast-furnace slag: Update/Correction/Removal Since the test is performed with mortar, the results may not provide a direct correlation of how the fly ash or natural pozzolan will contribute to strength in concrete. GGBFS is produced when molten slag is quenched rapidly using water jets, which produces a granular glassy aggregate. Type C Fly Ash: 33.5. read more... Total Construction Material & Solutions. Although the alkalinity determines the types of major minerals of steel slag, it does not determine the contents of these minerals. Some slag concretes have a slag component of 70% or more of the cementitious material. Kortom: met de Activity Tracker blijf je fit en altijd op de hoogte van je laatste berichten. ASTM C 989 (AASHTO M 302) classifies slag by its increasing level of reactivity as Grade 80, 100, or 120 (Table 3-1). the ratio of the compressive strength of a mortar cube made with equal amounts of slag and portland cement to the compressive strength of … Slag is a byproduct of steel production and is similar in character to volcanic rocks such as basalt and granite. 3) - the waste product of the steel making process. Also referred to as granules. Currently, most steel slag is used as aggregate for concrete, asphaltic paving and road bases. The fly ashes in the 1976 study were evaluated based on Federal Specification SS -P-570B. Air-cooled slag has a rough finish and larger surface area when compared to aggregates of that volume which allows it to bind well with portland cements as well as asphalt mixtures. ICE Virtual Library essential engineering knowledge. Granulated blast-furnace slag: The glassy, granular material formed when molten blast-furnace slag is rapidly chilled as by immersion in water. It is used as a cementitious material in Portland cement concrete. 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. For grade 120, SAI shall be less than 90% at 7 days and 110% at 28 days. As a measure of activity, we have used an index describing the average deviation of the horizontal field component from its normal value. The results show that the SAI of slag is more than 100% for both 7 and 28 days. Calcium silicate slag, Activity index, Storage time, Particle size distribution Abstract. Slag activity index: 100%. GBFS samples with different ratio of SiO2/Al2O3 were prepared under the laboratory conditions and ground by the agate ball mill at different times. In this study, slag cement (SC) is used to prepare different slag cement mortar (SCM) mixes to study mortar microstructure perspectives, physiochemical properties, mechanical properties and durability performance. The tests also included the evaluation of SC setting time and slag activity index. 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. to saturation with slag reagents and is then washed out and moves in the solid form to the slag. ... 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. This study was conducted to propose an effective method to evaluate the activity of high-alkalinity steel slag. To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Slag-activity Index. 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. This paper presents the experimental results of the fineness effect on the pozzolanic activity of Cu-Ni slag in cemented tailing backfill. HI7 and HI28, thus obtained, have been mapped onto a Slag Activity Index (SAI) plot, giving an indication of the ranges of strength of slag. Hou je stappen, kilometers en aantal uren slaap bij. 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. GGBFS was first used in lime mortar production as early as the 1… classifications based on a slag activity index (SAI) – 120, 100, 80 • This is the ratio of a slag cement mortar to a reference cement mortar • Residue on the 45 micron screen is limited to 20% • Air content of a slag mortar is limited to 12% • Sulfide Sulfur < 2.5% • Sulfate < … Compressive Strength machine Poking Rod , Petroleum Jelly Proving ring with all accessories suitable for calibration of CST machine Tachometer Cube Moulds 70.6 × … The hydration activity index of GGBS wi … The SAI of the materials was determined and the results are presented in Table 3. 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%). Granulated blast furnace slag (GBFS) is a by-product of ironmaking and widely used in the cement and concrete. 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 compressive strength of the mortar was determined according to ASTM C109 . Keywords: mechanical properties, pozzolanic activity, volume stability, copper slag, cementitious materials. Grade 120 has a high activity index and is more cementitious than OPC. The hydration samples of phosphorous slag powders with high-calcium fly ash content were analyzed using XRD, DSC-TG and SEM. Lijnen zijn kort en je krijgt direct eigen verantwoordelijkheid en vertrouwen. Slag cement usually decreases water demand between 1% and 10%, depending on dosage. 325) sieve shall not exceed 20 percent. SCA Board Member Login SCA Technical Marketing Committee Login The results show that the activity index of the composite mineral admixture with higher GGBS content is larger, and this phenomenon is … 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. This login area is for SCA members only and is used to disseminate association meeting and activity information to members. 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. Since the test is performed with mortar, the results may not provide a direct correlation of how the fly ash or natural pozzolan will contribute to strength in concrete. The physical properties of the slag have to be in accordance with the requirements for fineness as determined by air permeability and air content, slag activity index, and compressive strength. ASTM C 1073 covers a rapid determination of hydraulic activity of 59 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). Naast de gebruikelijke puzzelwoorden kom je tijdens je zoekopdrachten duizenden weetjes tegen. Like fly ash, slag cement will generally enhance the workability of concrete. Slag activity index, which is defined as similar to the SAI, only differs by 50% replacement of slag . Specifications and Grade of Ground Granulated Iron Blast-Furnace Slags ASTM C 989 (AASHTO M 302) Grade 80 Slag with a low activity index Grade 100 Slag with a moderate activity index Grade 120 Slag with a high activity index 7. Grade 100 must obtain an SAI of more than 70% at 7 days and 90% at 28 days. Verbeter uw gezondheid met de Garmin Index Smart Scale, de verbonden weegschaal met meetfuncties om gewicht, Body Mass Index, lichaamsvet, spiermassa en meer te meten. The activity index is the compressive strength of mortar made with 50-50 combinations of the slag and Portland cement expressed as a percentage of the strength of mortars made with the reference cement Copper slag based pastes had good volume stability. Grade 100 must obtain an SAI of more than 70% at 7 days and 90% at 28 days. Cement paste and cemented tailing backfill samples that without or contain Cu-Ni slag with various grinding times were made and cured at 20°C for 7, 28, and 150 days. The difference of activity among different types of high-alkalinity steel slag cannot be further distinguished by alkalinity. Type C Fly Ash: 33.5. read more... Total Construction Material & Solutions. and Jisc. We hope the information here will be helpful. By comparison water-cooled blast furnace slags of similar composition and Blaine fineness satisfy grade 120 of ASTM C989. Discover the world's research. The three grades, 80, 100, and 120, are classified according to their slag activity index which is average compressive strength of the slag-reference cement cubes (SP), divided by the average compressive strength of the reference cement cubes (P), multiplied by 100 (see Table 1). Request. INVESTIGATION OF HYDRAULIC ACTIVITY OF GROUND GRANULATED BLAST FURNACE SLAG IN CONCRETE. 2. related to iron and steel slag products. 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). 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