The suitable dosage was 0.03 % of the material to be ground. The steel slag and granulated blast-furnace slag powders ground with this composite grinding aid gave higher fineness and the cementing material produced exhibits higher mechanical strength at any age, indicating that there is a synergistic effect among the materials used.
blast furnace slag cement, grinding the clinker component to a higher fineness should be practiced, as it is more effective in regulating the strength and it is also more cost-effective clinker grinding is less energy consuming than grinding slag as expressed by shorter grinding times required for the same fineness levels12.
Granulated Blast Furnace Slag (GBFS) contains a high level of moisture, it is hard to grind and very abrasive. 2 Natural pozzolans may not be as hard to grind as GBFS but may contain high moisture levels and be abrasive. 2 Both of these materials require grinding systems designed to deal with high moisture, hardness and abrasiveness.
The physical properties of each of these two categories are not fixed and properties such as weight, grain size, structural properties, etc., vary depending on the type of slag production process. The components of slag are mainly lime, silica and alumina and are very similar to the components of Portland cement.
Notwithstanding their size, the choice of grinding media is also a critical component of the problem, as Ni slag for instance is a particularly abrasive carbonatable feedstock. Another parameter of importance is the rheology of the system, which was uncontrolled in the batch experiments used in this study.
1 Article 2 Grinding Kinetics of Slag and Effect of Final Particle 3 Size on the Compressive Strength of Alkali Activated 4 . Materials . 5 . Evangelos Petrakis . 1, *, Vasiliki Karmali . 1, Georgios Bartzas . 2. and Kostas Komnitsas . 1. 6 . 1 Technical University of Crete, School of Mineral Resources Engineering, University Campus,
In general, the optimum blend of slag for greatest strength at 28 days seems to be about 50%. Slag concrete generally develops strength slowly than concrete without GGBFS. Although this situation is a disadvantage for early ages of concrete such as 3 or 7 days, slow development of strength is an advantage for ages 28 days or later.
slag grinding with loesche vertical roller mills. Jul 2,, Vertical roller mills by Loesche for grinding slag and cement have been in operation for, properties the grinding parts (M-rollers and table. Read more
Approval of the thesis: INVESTIGATION OF THE PROPERTIES OF PORTLAND SLAG CEMENT PRODUCED BY SEPARATE GRINDING AND INTERGRINDING METHODS submitted by ÇA ĞLAR GEVEN in partial fulfillment of the requirements for the degree of Master of Science in Cement Engineering Department, Middle East
The effects of the ground, granulated blast furnace slag (slag for short, Nanjing Jiangnan Grinding Co., Ltd.) in various amounts (0–40 wt%) on the properties of MKPC were investigated.The chemical and mineralogical compositions, which were analyzed by XRF and XRD, are shown in Table 1 and Fig. 1, respectively.The slag had a surface area of 0.42 m 2 /g …
12%It is well known that grinding aids (GA) have the important functions such as accelerating crushing, eliminating agglomeration and decreasing specific surface energy, and are commonly added to improve the powders grinding processes [ 12 – 19 ].
furnace slag which is defined as 'vitrified slag material made by rapid cooling of slag melt of suitable composition, obtained by smelting iron ore in a blast furnace, consisting of at least two-thirds by mass of glassy slag, and possessing hydraulic properties when suitably activated', and where its chemical composition
International slag as a fine aggregate on the properties of cement mortars Organization for Standardization, Geneva, Switzerland, 2006. and concrete," Construction and Building Materials, vol. 25, [46] J. B. Guinee, "Handbook on life cycle assessment operational pp. 933–938, 2011.
A study of intergrinding and separate grinding of blast. 1. Introduction. Since the first discovery of cementitious properties of blast furnace slag (BFS) by Emil Langen in 1862 and particularly after the oil crisis in 1970s, manufacture of blast furnace slag cement (BFC) has substantially increased due to greater emphasis on energy conservation, utilization of waste …
The ultrafine slag slurry (UFSS) was obtained by the process of grinding the original slag in a wet ball mill, which was mixed in concrete directly. The durations of grinding were 20 min, 40 min, and 60 min which were used to replace Portland cement with different percentages, namely, 20, 35, and 50, and were designed to compare cement with ...
Granulated blast furnace slag Just like air-cooled blast furnace slag, this slag has a hydraulic property and there is no risk of alkali-aggregate reaction. Because of the powerful latent hydraulic property that results from fine grinding, this slag is used in products such as Portland blast furnace slag cement.
BFS used in this study, is water cooled slag supplied from Iron and Steel Factory, Helwan, Egypt. The slag was firstly ground in laboratory ball mill for 3 hours to obtain Blaine specific surface area of 610m 2 /kg with specific gravity of 3000 kg/m 3. The chemical composition of MK and BFS was determined by X-ray fluorescence.
Characteristics such as colour, moisture content, bulk density, porosity, grain shape, grading curve and grindability of BF slag are affected by different chemistry, melting temperature and the granulation process conditions.
In the Australian concrete industry context, the term 'slag' generally refers to ground, granulated, iron blast furnace slag – with the descriptors to be explained and developed in this technical note.
What is Slag Cement. Slag cement is a hydraulic cement formed when granulated blast furnace slag (GGBFS) is ground to suitable fineness and is used to replace a portion of portland cement. It is a recovered industrial by-product of an iron blast furnace. Molten slag diverted from the iron blast furnace is rapidly chilled, producing glassy ...
The gas-quenching steel slag abrasives have good chemical stability and particle size uniformity, and we have chosen aluminum alloy and copper alloy as the base materials to study their grinding properties. We expect to provide a theoretical basis for the gas-quenching steel slag abrasives for application to the grinding field. 2.
Request PDF | Effect of wet-grinding steel slag on the properties of Portland cement: An activated method and rheology analysis | Steel slag is a solid waste generated from the steelmaking process.
The necessary grinding of the slag to the finenesses required for cement is now mostly performed in vertical mills (Fig. 7), which achieve throughputs of over 100 t/h [2]. Of the 16.3 Mta of steelworks slag in Europe, 52.3 % are BOF slag, 34.9 % are EAF slag and 12.6 % are other types of steelworks slag.
This study investigates the mechanical properties and durability of three families of high-performance concrete (HPC), in which the first was blended with fly ash, the second with circulating fluidized bed combustion (CFBC) ash, and the third with CFBC slag. In addition to each of the three mineral additives, silica fume and a superplasticizer were also incorporated …
Slags containing a high percentage of lime after granulation and grinding, but without the addition of slaked lime, have a very high degree of hydraulicity and strength. Attempts have been made to produce slags approaching the Portland cement composition—i.e., to make a slag which, when finely ground, would be a Portland cement.
Properties And Effects Of Copper Slag In Concrete 46 PROPERTIES AND EFFECTS OF COPPER SLAG IN CONCRETE M. V. PATIL Applied Mechanics Department, S.V. National Institute of Technology, Surat, Gujarat Abstract: Copper slag is a by-product obtained during matte smelting and refining of copper. This work reports an
Use Of Steel Slag Grinding Products . The purpose of steel slag grinding products is to recycle the waste after making powder through the steel slag micro-powder vertical mill production line, which can be used to replace clinker for cement production, replace cement for concrete and produce steel slag composite powder.
12%Steel slag, a by-product from the steel-making process, is a potential mineral admixture for cement or concrete production [].C 3 S, C 2 S, C 4 AF, and C 2 F are common minerals in steel slag, which endow steel slag with cementitious properties [2, 3].The main hydration products of steel slag include C–S–H gel and Ca(OH) 2, which are very …
Magnetic reseparation of the steel slag can improve the efficiency of intergrinding steel slag and OPC clinker by about 50% compared with intergrinding OPC clinker and nonmagnetically reseparated steel slag. The grindability of mixtures of steel slag and OPC clinker depends on the relative content and initial pregrind size of the steel slag.
grinding plant for granulated blast furnace slag is pre-sented in Figure 1. The fi ner is the grinding of slag, the better are some properties, especially strength (primary, fi nal), workability (plasticity) and bonding. The fi nely ground slag has a larger specifi c surface area and thus a larger water reaction surface area. Moreover, contact
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