alkali activated slag

alkali activated slag

What is Alkali-Activated Slag? Niumag Corporation

Apr 20, 2019  Alkali-Activated Slag,AAS is a hydraulic-cementing material (Slag and fly ash have potential activity), with dry granulated blast furnace Slag as the main raw material, with appropriate amount of silicate cement clinker, a small amount of dihydrate gypsum, and an appropriate amount of Alkali activator, consisting of 80%~85% Slag, 5%~10% Alkali activator, and cement clinker.

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Alkali-activated slag characterization by scanning ...

Oct 01, 2020  Alkali-activated blast furnace slag cements have been studied since the 1930s due to their high compressive strength; they can exceed 100 MPa in 28 days. The low Ca/Si ratio in slag improves its resistance to aggressive chemical materials such as acids, chlorides and sulphates.

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Alkali-activated slag concrete: Fresh and hardened ...

Jan 01, 2018  The blast furnace slag and cement concretes were designed to a total content of 357 kg/m 3.The OPC concrete was mixed with water and 0.1% (cement weight) chemical admixture, whereas the alkali-activated slag concretes were mixed with one of two solutions ():Panreac 98% pure, 10 M NaOH (5% Na 2 O by slag mass). Sodium silicate hydrate or waterglass (5% Na 2 O by slag mass,

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A review on alkali-activated slag concrete - ScienceDirect

Jun 01, 2021  The effect of GGBFS:PCC, Na 2 O ratio, Ms and W/B on the 7-day and 28-day CS of ambient cured alkali-activated slag cement concrete (AASCC) and also the participation percentage of each parameter was calculated as presented in Fig. 20. The most significant parameter that affects the 7-day and 28-day CS was the binder ratio (GGBFS:PCC) with ...

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A review on alkali-activated slag concrete - ScienceDirect

Jun 01, 2021  The effect of GGBFS:PCC, Na 2 O ratio, Ms and W/B on the 7-day and 28-day CS of ambient cured alkali-activated slag cement concrete (AASCC) and also the participation percentage of each parameter was calculated as presented in Fig. 20. The most significant parameter that affects the 7-day and 28-day CS was the binder ratio (GGBFS:PCC) with ...

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A Review of Durability and Strength Characteristics of ...

Alkali-activated slag (AAS) is a promising alternative to ordinary Portland cement (OPC) as sole binder for reinforced concrete structures. OPC is reportedly responsible for over 5% of the global CO 2 emission. In addition, slag is an industrial by-product that must be land-filled if not re-used.

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Alkali activated slag binder: effect of cations from ...

Oct 24, 2016  All alkali activated slag binders were prepared by mixing the slag with the same amount of different alkali silicate solution, respectively and adding water to realize a water-to-slag ratio (w/s) of 0.35. Therefore a constant molar ratio of M 2 O to slag is ensured. Methods.

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Advances in Understanding the Alkali-Activated ...

May 25, 2021  This paper summarized and reviewed the mechanism and macro-performance of alkali-activated metallurgical slag, including steel slag, copper slag, ferronickel slag, and lead-zinc slag. Better activated method and alkali-activator are still needed to be developed to improve the performance of the metallurgical slag with low reactivity. Besides, the chemical components#x2019; variation of

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Using Carbonated BOF Slag Aggregates in Alkali-Activated ...

This experimental study aimed to develop alkali-activated concretes containing carbonated basic oxygen furnace (BOF) slag aggregates. In the first stage, the impacts of replacing normal aggregates with carbonated BOF slag aggregates in different alkali-activated concretes were determined by assessing mechanical properties (compressive and flexural strengths), morphology, thermogravimetric ...

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Kinetics of Alkaline Activation of Slag and Fly ash-Slag ...

Alkali-activated aluminosilicates, commonly known as "geopolymers", are ... 2.4: Reaction mechanism of alkali activated slag [F Jimenez 2000] ..... 16 2.5: Concept mapping of the reaction products [Yip et al 2005] ..... 16 2.6: Effect of alkali dosage and silicate modulus on setting times of alkali- ...

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FTIR Analysis of Alkali Activated Slag and Fly Ash Using ...

and temperature on the alkali silicate activated slag using FTIR deconvolution technique. Also, the in uence of cation (Na and K) on alkali activated slag over time has been analyzed. 2.Analyze the in uence of added silicate in the alkali activation of y ash using FTIR results. The e ect of cation (Na and K) and initial parameters were also

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(PDF) Setting of Alkali-Activated Slag Cement. Influence ...

The objective of this work was to determine the mechanisms that govern the setting times of alkali-activated slag (AAS) cement pastes, as a function of the nature of the alkaline activator used.

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Alkali-activated metakaolin-slag blends—performance and ...

Feb 22, 2007  The alkali-activated slag (AA-S) comprises still unreacted slag (broad peak at −74 ppm) and reaction product that can be seen as a broad peak in the range between −75 and −87 ppm. The alkali-activated blends (AA-M50/S50 and AA-M25/S75) show peaks of more or less unreacted slag and metakaolin and peaks of reaction products in the whole ...

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Application of alkali activated slag cement for ...

Application of alkali activated slag cement for solidification of radioactive wastes in reprocessing plant. Nuclear recycling. RECOD 98. 5. international nuclear conference on recycling, conditioning and disposal. [en] The alkali activated slug cement was examined to solidify sodium nitrate waste and incinerator ash, those are radioactive ...

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PROSPECTIVE RETARDERS FOR ALKALI-ACTIVATED SLAG:

an alkali-activated slag system, which has a short, or fast, hardening time. This is not conducive to its use in mainstream construction and a control of the setting or hardening time is essential. Several retarders have been conventionally used for this purpose in the ordinary Portland cement systems. This investigation hopes to study

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Alkali-activated and geopolymer materials developed using ...

The results showed that the strength of the PAC mixtures containing alkali-activated slag grouts with high alkali concentrations was lower. However, a structural PAC mixture containing alkali-activated slag grout with compressive strength of 34.5 MPa and modulus of elasticity of 30.2 GPa was developed. 7. Production using 3D printing

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Alkali Activated Fly Ash: Blast Furnace Slag Composites ...

Dec 16, 2020  Covers mechanical and microstructural properties, curing, durability of blended Alkali- activated composites with fly ash and blast furnace slag. Proposes a guideline for mix design on chemical compositions of ingredients, relationship of synthesizing parameters, workability, target strength.

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(PDF) Alkali-Activated Stainless Steel Slag as a ...

Jul 14, 2021  Alkali-Activated Stainless Steel Slag as a Cementitious . Material in the Manufacture of Self-Compacting Concrete . Julia Rosales, Francisco Agrela *,

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Alkali-Activated Slag Cementitious - MDPI

The alkali activator was prepared by sodium hydroxide solution and sodium silicate (SiO2-37%, Na2O-17.7%, H2O-45.3%). To retard the fast setting behaviors of alkali-activated slag cementitious, the phosphoric acid was used as a setting retarder. The alkali activator was mixed to keep the following proportion: SiO2 = 100 g/L,

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Alkali-activated slag cement and concrete: a review of ...

Jul 27, 1995  This paper summarizes the advantageous and disadvantageous properties of alkali-activated slag cement and concrete by reviewing previously published work in English, Russian and Chinese. Practical problems and theoretical questions are discussed. Topics for

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PERFORMANCE OF ALKALI ACTIVATED SLAG WITH VARIOUS ALKALI ...

The performance of alkali-activated slag concrete with sodium silicate, sodium hydroxide, sodium carbonate as activator are used at 4% Na2O (by weight of slag) and 4% of hydrated lime by total weight of solid binder content if used as a retarder. The scope of the work covered four mixes: - Normal OPC mix and three alkali activated slag mixes of ...

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PROSPECTIVE RETARDERS FOR ALKALI-ACTIVATED SLAG:

an alkali-activated slag system, which has a short, or fast, hardening time. This is not conducive to its use in mainstream construction and a control of the setting or hardening time is essential. Several retarders have been conventionally used for this purpose in the ordinary Portland cement systems. This investigation hopes to study

More

(PDF) Alkali-Activated Stainless Steel Slag as a ...

Jul 14, 2021  Alkali-Activated Stainless Steel Slag as a Cementitious . Material in the Manufacture of Self-Compacting Concrete . Julia Rosales, Francisco Agrela *,

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Mechanism of Alkali-Activated Copper-Nickel Slag Material

Jan 22, 2020  A copper-nickel slag-based alkali-activated cementing material (CNSCM) for backfilling was prepared using copper-nickel slag as a raw material and sodium silicate (SS) as an activating agent. The effects of SS content (6%, 8%, and 10%) and curing humidity on the compressive strength of CNSCM were investigated using an electronic universal testing machine.

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Shrinkage Characteristics of Alkali-Activated Slag Cements ...

Jul 07, 2015  Alkali-activated slag mixtures with comparable strength to OPC show a higher autogenous and drying shrinkage. A lower elastic stiffness, higher degree of saturation, and potentially higher chemical shrinkage contribute to the high autogenous shrinkage of AAS. A lower elastic stiffness also leads to a large drying shrinkage, although other ...

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Application of alkali activated slag cement for ...

Application of alkali activated slag cement for solidification of radioactive wastes in reprocessing plant. Nuclear recycling. RECOD 98. 5. international nuclear conference on recycling, conditioning and disposal. [en] The alkali activated slug cement was examined to solidify sodium nitrate waste and incinerator ash, those are radioactive ...

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Influence of seawater on alkali-activated slag concrete ...

May 12, 2021  The alkali-activated slag samples showed the carbonation of calcium silicate hydrate (C–S–H), which resulted in the reduction in strength with time. The seawater-mixed alkali-activated slag samples produced additional reaction products, C4AH13, and chloride-bearing hydrocalumite, and they improved the strength. The seawater-mixed alkali ...

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Alkali-activated and geopolymer materials developed using ...

The results showed that the strength of the PAC mixtures containing alkali-activated slag grouts with high alkali concentrations was lower. However, a structural PAC mixture containing alkali-activated slag grout with compressive strength of 34.5 MPa and modulus of elasticity of 30.2 GPa was developed. 7. Production using 3D printing

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Present State and Future of Alkali-Activated Slag Concretes

Present State and Future of Alkali-Activated Slag Concretes. This paper will present the latest publications dealing with the development and practical application of activated slag clinker-free concretes with special reference to less known papers and recent information. The finely ground slag, usually granulated blast furnace slag, is ...

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Alkali-Activated Fly Ash Blast Furnace Slag Composites ...

Dec 16, 2020  Covers mechanical and microstructural properties, curing, durability of blended Alkali- activated composites with fly ash and blast furnace slag. Proposes a guideline for mix design on chemical compositions of ingredients, relationship of synthesizing parameters, workability, target strength.

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Degree of Slag-Based Alkali Activated Composites

Aug 10, 2021  alternatives, alkali-activated materials have attracted attention as a promising cementitious binder. In this paper, the chemical stability of the matrix, in fiber-reinforced slag-based alkali-activated composites, was studied, in order to assess any possible effect of the presence of the reinforcement on the chemistry of polycondensation.

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Alkali Activated Systems

August 2013 Alkali Activated Systems Understanding the Influence of Curing Conditions and Activator Type/Chemistry on the Mechanical Strength and Chemical Structure of Fly Ash/Slag Systems

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