Post-doctoral Researcher, Department of Civil Engineering, Tsinghua University, Beijing, People's Republic of China, Professor, Department of Civil Engineering, Tsinghua University, Beijing, People's Republic of China, PhD candidate, Department of Civil Engineering, Tsinghua University, Beijing, People's Republic of China, Copyright © ICE Publishing 2021, all rights reserved, Development, planning and urban engineering, Geology, geotechnical and ground engineering, Water engineering and wastewater management, https://doi.org/10.1680/macr.2011.63.10.737, Experimental blastfurnace cement incorporating high-magnesia slag, Magazine of Concrete Research, Volume 3, Issue 9, Investigation of the hydration of Portland blastfurnace slag cement: hydration kinetics, Advances in Cement Research, Volume 2, Issue 5, HEAVYWEIGHT CONCRETE WITH STEEL SLAG AGGREGATES. For grade 120, SAI shall be less than 90% at 7 days and 110% at 28 days. 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. Slag Activity Index Min., percent Average of Last 5 The ASTM C989 slag-activity index is often used as a basic criterion for evaluating the relative cementitious potential of slag cements. 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. 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. 2 Slag Activity Index Clause 6 Table 2 Vibration machine with timer & cube mould fitting assembly 12000 ± 400 vibration per min. Calcium silicate slag is a waste discharged during alumina extraction process from fly ash was investigated. Update/Correction/Removal 1) - to spit. Also referred to as granules. Slag is a byproduct of steel production and is similar in character to volcanic rocks such as basalt and granite. Type C Fly Ash: 33.5. read more... Total Construction Material & Solutions. Slag is a byproduct of steel production and is similar in character to volcanic rocks such as basalt and granite. 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. GGBFS is produced when molten slag is quenched rapidly using water jets, which produces a granular glassy aggregate. Grade80 has a low activity index and is used primarily in mass structures becauseit generates less heat than portland cement. Steel slag is a potential mineral admixture for cement or concrete production (Shi, 2004). Some slag concretes have a slag component of 70% or more of the cementitious material. Copper slag based pastes had good volume stability. We hope the information here will be helpful. The difference of activity among different types of high-alkalinity steel slag cannot be further distinguished by alkalinity. 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. Currently, most steel slag is used as aggregate for concrete, asphaltic paving and road bases. 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. Grade 120 has a high activity index and is more cementitious than OPC. The molten slag then goes through a particular process depending on what type of slag it will become. Slag activity index: 100%. 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. 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). De Activity Tracker is een horloge met heel veel slimme functies. 1. Screper2 Slag Activity Index Clause 6 Table 2 Vibration machine with timer & cube mould fitting assembly 12000 ± 400 vibration per min. Compressive Strength machine Poking Rod , Petroleum Jelly Planetary mixer Jolting apparatus Scraper and demoulding device Proving ring with all accessories suitable for calibration of CST machine GGBFSis divided into three classifications based on its activity index. The higher the activity index, the higher the hydration activity of the steel slag. 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. ICE Virtual Library essential engineering knowledge. The results show that the activity index of the composite mineral admixture with higher GGBS content is larger, and this phenomenon is … 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. Compressive strength of concrete containing slag. GGBFS was first used in lime mortar production as early as the 1… In totaal met ruim 160 medewerkers. 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 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. The hydration activity index of GGBS wi … Grade 100 must obtain an SAI of more than 70% at 7 days and 90% at 28 days. 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. This login area is for SCA members only and is used to disseminate association meeting and activity information to members. 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. Strength activity index test: According to (ASTM C989-99) Slag activity is evaluated by determining the compressive strength of both Portland- cement mortars and corresponding mortars made with the mass combinations of slag and Portland cement. Slag cement (Ground granulated blast- furnace slag): A hydraulic cement formed when granulated blast-furnace slag is ground to a suitable fineness. As a measure of activity, we have used an index describing the average deviation of the horizontal field component from its normal value. 3) - the waste product of the steel making process. Slag is primarily used in the cement and construction industries, and largely in road construction. Welkom Welkom bij het puzzelwoordenboek waar je wat van opsteekt! 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. The micrographs and pozzolanic activity showed that copper slag had stronger reactivity than fly ash. CORE is a not-for-profit service delivered by The hydration samples of phosphorous slag powders with high-calcium fly ash content were analyzed using XRD, DSC-TG and SEM. 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. 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. 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. This study was conducted to propose an effective method to evaluate the activity of high-alkalinity steel slag. In Australia slag is standardised in AS 3582.2:2016. 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). 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. related to iron and steel slag products. Effect of the dosage of high-calcium fly ash and fineness of phosphorous slag powders on activity index of phosphorous slag powders was explored. Ground Granulated Blast Furnace Slag (GGBFS) is a by product of the steel industry. Discover the world's research. 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. Calcium silicate slag, Activity index, Storage time, Particle size distribution Abstract. Like fly ash, slag cement will generally enhance the workability of concrete. 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 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. 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. Pozzolanic activity may be directly determined by measuring the amount of reacted lime, using the technique of thermogravimetry analysis and differential thermal analysis (DTA). 4.1.1 Strength Activity Index— The test for strength activity index is used to determine whether fly ash or natural pozzolan results in an acceptable level of strength development when used with hydraulic cement in concrete. 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 < … ASTM C 989 (AASHTO M 302) classifies slag by its increasing level of reactivity as Grade 80, 100, or 120 (Table 3-1). Slag cement usually decreases water demand between 1% and 10%, depending on dosage. GBFS samples with different ratio of SiO2/Al2O3 were prepared under the laboratory conditions and ground by the agate ball mill at different times. 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. Naast de gebruikelijke puzzelwoorden kom je tijdens je zoekopdrachten duizenden weetjes tegen. 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 slag shall contain no additions and shall conform to the sulfide sulfur and sulfate chemical composition requirement. Lijnen zijn kort en je krijgt direct eigen verantwoordelijkheid en vertrouwen. ... 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. 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 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. Classification In accordance with ASTM C989, GGBFS has three strength grades which are determined by their respective mortar strength when they are mixed with equal mass of portland cement. 325) sieve shall not exceed 20 percent. Request. the ratio of the compressive strength of a mortar cube made with equal amounts of slag and portland cement to the compressive strength of … 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. 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. The thermal behavior of the original clay is presented by DTA analysis as shown Fig. Kortom: met de Activity Tracker blijf je fit en altijd op de hoogte van je laatste berichten. 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. Slag concrete compressive strength is mainly based on number of factors for instance slag type, finesses, activity index, and the amount employed in concrete mixtures in addition to other factors for example … Although the alkalinity determines the types of major minerals of steel slag, it does not determine the contents of these minerals. The compressive strength of the mortar was determined according to ASTM C109 . and Jisc. ASTM C 1073 covers a rapid determination of hydraulic activity of 59 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). High-alkalinity steel slag shows certain cementitious properties and should be given priority to be used as a supplementary cementitious material in concrete, based on economical and environmental considerations. The slag shall contain no additions and shall conform to the sulfide sulfur and sulfate chemical composition requirement. to saturation with slag reagents and is then washed out and moves in the solid form to the slag. En ontvang pushmeldingen van sms'jes of Instagram berichten van je vrienden. Slag-activity Index. For grade 120, SAI shall be less than 90% at 7 days and 110% at 28 days. This paper presents the experimental results of the fineness effect on the pozzolanic activity of Cu-Ni slag in cemented tailing backfill. Copper slag presented a potential application in mortars and concretes. 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. Granulated blast furnace slag (GBFS) is a by-product of ironmaking and widely used in the cement and concrete. Hou je stappen, kilometers en aantal uren slaap bij. Slag Activity Index Min., percent Average of Last 5 Consecutive Samples Any Individual Sample 7-Day index Grade 80 - - Grade 100 75 70 Grade 120 95 90 28-Day index Grade 80 75 70 Grade 100 95 90 Grade 120 115 110 For fineness, the amount retained when wet-screened on a 45 µm (No.