pics of slag admixture
Different mineral admixtures in concrete: a review
In this study, cement is partially or completely replaced by different mineral admixtures such as fly ash, silica fume, rice husk ash, Ground Granulated Blast …
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Steel-slag: a supplementary cementious material and basis for energy
The higher its alkalinity, the higher the proportion of highly-reactive minerals. Steel-slag with alkalinity greater than 1.8 is usually recommended. 2. Steel-slag can be used to produce energy-saving cement by co-grinding with OPC clinker and blastfurnace slag. In such preparations OPC clinker is about 15-30%, steel-slag around 30-40% and ...
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Materials | Free Full-Text | Some Issues of Shrinkage …
Significant drying shrinkage is one of the main limitations for the wider utilization of alkali-activated slag (AAS). Few previous works revealed that it is possible to reduce AAS drying shrinkage by the use of …
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Blast-furnace slag as a mineral admixture for concrete
Blast-furnace slag as a mineral admixture for concrete. Finely ground slag may be blended with portland cement or added to other ingredients at the mixer. BY DONALD W. …
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Enhancement effect and mechanism of iron tailings
Highlights. •. Iron tailings powder as admixture can improve the comprehensive utilization rate of tailings. •. Compared with limestone powder, iron tailings can enhance the long-term strength of concrete. •. Si–O and Al–O on tailings surface have bonding reaction in the slag composite admixture. •.
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Effect of Phosphorus Slag Admixture on the Properties and …
cementitious material (CWM) are CFA, Bayer red mud (RM), blast furnace slag (BFS), cement clinker (CC), and an admixture. The admixtures are blast furnace slag with a high specific surface area (HBFS), phosphorus slag (PS), and gasification slag (GS). CFA and RM were by-products from a power plant and an aluminum plant, …
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Influence of steel slag fineness on the hydration of cement-steel slag
Steel slag has the potential to be used as a mineral admixture, but its wide utilization is restricted by the low activity. Grinding may increase the slag's hydration activity. However, little is known about the role of superfine steel slag in the composite cement paste.In this work, the hydration, microstructure, and macroscopic performances of the …
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Effect of admixtures on properties of alkali-activated slag concrete
The same sodium-silicate-activated slag concrete with WRRe admixture of 6 ml/kg had a slump of 80 mm and had better workability than concrete without admixture, but it also had some retardation in the initial set. WRRe admixture addition of 10 ml/kg in the same concrete mix produced a slump of 200 mm, which was reduced to zero after 40 …
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Types of Admixtures of Concrete & Cement | Chemical, Mineral
Mineral admixtures - Fly-ash Blast-furnace slag, Silica fume and Rice husk Ash etc. Chemical admixtures 1. Water-reducing admixture / Plasticizers: ... An admixture which, when added to concrete, mortar, or grout, increases the rate of hydration of hydraulic cement, shortens the time of set in concrete, or increases the rate of hardening or ...
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Stabilization of Shield Muck Treated with Calcium Carbide Slag
Solidifying shield muck with calcium carbide slag and fly ash as curing agents was proposed as a highly efficient method for reusing waste shield muck. The compaction test, unconfined compression test, and dry–wet cycle test were used to evaluate the compressive strength, water immersion stability, and durability of the cured soil. The …
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Drying shrinkage and microstructure characteristics of mortar
Section snippets Materials. In the present study, ground granulated blast furnace slag (GGBFS) samples with fineness values of 3000, 4000 and 8000 cm 2 /g were used as the replacement of cement, with up to 45% by weight of cement replaced. Three types of cement, i.e., ordinary Portland cement (N), moderate heat Portland cement (M), …
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Frontiers | Effect of Iron Tailings and Slag Powders on Workability …
Slag powder is a kind of mineral admixture with higher activity, which has a faster hydration reaction and can produce more hydration products, so it has higher strength. When the ratio of iron tailings powder to mineral admixtures (slag powder and iron tailings powder) is less than 50%, the compressive strength of concrete with different …
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Buildings | Free Full-Text | Physico-Chemical Substantiation of
Cement-sand samples based on Portland cement (OPC) and slag-Portland cement (SPC) with GGBFS admixture showed higher compressive and flexural strength characteristics in the initial hardening periods and at 28 days. It was found that modified samples are more stable in an aggressive medium.
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What is Alccofine? Its Application and Advantages
The performance of Alccofine is the best overall admixture used in India because of its high calcium oxide (Cao) content. ... micro-fine, and ultrafine particle sizes. Alccofine 1203 is a slag-based supplementary cementitious material (SCM) having ultra-fineness with optimized particle size distribution. Due to its ultra fineness of Alccofine ...
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Chemical Admixtures and Slag | GCP Applied Technologies
Chemical Admixtures and Ground Granulated Blast-Furnace Slag. Since most chemical admixtures perform well in plain Portland cement mixtures and in …
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Ground Granulated Blast-Furnace Slag: Its Chemistry and …
• ACI 233, "Slag Cement in Concrete and Mortar". Classifications According to ASTM C989, GGBFS is classified into three grades according to its performance in the "slag activity test". The three grades are: Grade 80, Grade 100 and Grade 120. Slag activity is determined by the following formula: Slag activity index, % (SP / P) 100 Where:
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Utilization of steel slag from industrial waste for ionizing radiation
In a literature review, bibliometrics is typically utilized to describe the larger picture. 2.1. Search strategy, database, and keyword. ... Mainly, concrete with steel slag admixture has a lower HVL than Portland concrete or concrete with natural aggregate limestone. Steel slag aggregate can improve concrete density, reducing the shielding ...
ادامه مطلبDifferent mineral admixtures in concrete: a review
The present work reviews the various mineral admixtures used in concrete which modifies the concrete properties. In this study, cement is partially or completely replaced by different mineral admixtures such as fly ash, silica fume, rice husk ash, Ground Granulated Blast Furnace Slag, palm oil fuel ash and metakaolin. The strength obtained …
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(PDF) Some Issues of Shrinkage-Reducing Admixtures
Abstract. Significant drying shrinkage is one of the main limitations for the wider utilization of alkali-activated slag (AAS). Few previous works revealed that it is possible to reduce AAS drying ...
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Ground Granulated Blast Furnace Slag (GGBFS) in Concrete
GGBFS is a byproduct of the iron and steel industry, specifically from the production of iron in blast furnaces. It is obtained by rapidly quenching molten slag from the blast furnace …
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Blast-Furnace Slag as a Mineral Admixture for Concrete
Blast-Furnace Slag as a Mineral Admixture for Concrete. Finely ground slag may be blended with portland cement or added to other ingredients at the mixer. By Donald W. . Download the PDF version of this article. (316.5 kB)
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Effect of Phosphorus Slag Admixture on the Properties and …
This research aims to reveal the effect of phosphorus slag (PS) admixtures on the properties and hydration mechanism of circulating fluidized bed fly ash (CFA)-based multi-solid waste cementitious material (CWM). The results indicate that PS as an admixture is more helpful for improving the performance of CWM systems compared …
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Minerals | Free Full-Text | Admixture Effects on the Rheological
Recently, alkali-activated slag (AAS) has attracted extensive attention in cemented paste backfill (CPB) due to its low cost/CO2 emissions and high strength benefits. However, a comprehensive analysis of the mechanical/rheological behavior and microstructure evolution of AAS-CPB using mineral admixtures is still lacking. In this …
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Mechanical and durability performance of concretes
The steel slag mineral admixture, called steel slag powder, was produced from the steel slag fine aggregate. This material passed through the #4.76 mm sieve and was comminuted in a low-efficiency ball mill (Marconi MA500, 200 RPM, stainless steel jar and balls) for 3 h.
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Analysis of melting reconstruction treatment and cement
The reconstructed slag further solidified by cement could be applied to landfill and construction materials. The technology of melting reconstruction treatment with cement solidification was a technical-economical choice for the industrial treatment of U-MSWI fly ash. ... In addition, the reconstructed slag generated can be used as an admixture ...
ادامه مطلبHydration properties of mixed cement containing ground
As an admixture material, fine powders of blast-furnace slag and fly ash are typically used among industrial by-products. Admixture materials has been used only for specific concrete production, but their application is growing because of their economic feasibility, stability, and environmental characteristics [].The KS regulations on blast …
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Magnesium Slag Generated by Reduction Smelting Using …
Magnesium slag that is piled in the open air is basically in the form of fine powder after the magnesium slag decomposes naturally. The particle size of the slag is measured with a laser particle size tester (Microtrac X-100), and the particle size distribution diagram is shown in Fig. 3.2.Table 3.2 shows the corresponding composition of the slag.
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Different carbon treatments for steel slag powder and
Steel slag powder is the waste slag produced in the steelmaking process, and its emissions account for about 15%–20% of crude steel production in China (Shi et al., 2022a; Shi, 2004; Wang et al., 2011). ... steel slag clinker and steel slag admixture. Feng (Peng et al., 2022) et al. think that the use of steel slag as concrete aggregate is an ...
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Placement and Design of Concrete in Drilled Shaft Construction: Part 2
This increases the workability of the fluid concrete without the need for excessive water. There are three main types of water-reducing admixtures: low-range water reducing admixture (reduces water by 5 to 10%); mid-range water-reducing admixture (reduces water by 6 to 12%); and high-range water-reducing admixture (reduces water …
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Supplementary cementing materials
Supplementary cementing materials (SCMs) are used to partially replace the Portland cement component in concrete. Some examples of SCMs are the following: fly ash, slag cement, silica fume, and metakaolin. Although SCMs vary in origin, physical properties, and chemistry, they all exhibit pozzolanic and/or cementitious properties.
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