The difference of activity among different types of high-alkalinity steel slag cannot be further distinguished by alkalinity. We hope the information here will be helpful. Discover the world's research. 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. 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. 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. En ontvang pushmeldingen van sms'jes of Instagram berichten van je vrienden. The ASTM C989 slag-activity index is often used as a basic criterion for evaluating the relative cementitious potential of slag cements. 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 molten slag then goes through a particular process depending on what type of slag it will become. The results show that the SAI of slag is more than 100% for both 7 and 28 days. 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. 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. 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 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 slag shall contain no additions and shall conform to the sulfide sulfur and sulfate chemical composition requirement. CORE is a not-for-profit service delivered by Slag is a byproduct of steel production and is similar in character to volcanic rocks such as basalt and granite. 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). 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. 3) - the waste product of the steel making process. 2. Activity Index) that is in the current ASTM C618 specification. 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. similar. For grade 120, SAI shall be less than 90% at 7 days and 110% at 28 days. 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. This paper presents the experimental results of the fineness effect on the pozzolanic activity of Cu-Ni slag in cemented tailing backfill. In Australia slag is standardised in AS 3582.2:2016. 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 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). 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. 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. 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. ASTM C 989 (AASHTO M 302) classifies slag by its increasing level of reactivity as Grade 80, 100, or 120 (Table 3-1). The higher the activity index, the higher the hydration activity of the steel slag. 2 Slag Activity Index Clause 6 Table 2 Vibration machine with timer & cube mould fitting assembly 12000 ± 400 vibration per min. Slag Activity Index Min., percent Average of Last 5 Discover our research outputs and cite our work. 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. Steel slag is a potential mineral admixture for cement or concrete production (Shi, 2004). 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.