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  • Why Alkali-Activated Materials are NOT Geopolymers ...

    Jul 27, 2017  Prof. J. Davidovits explains the main differences between AAC (Alkali-Activated Cement or Concrete), AAS (Alkali-Activated Slag), AAF (Alkali-Activated Fly Ash) and Slag-based Geopolymer cement, in terms of chemistry, molecular structure, long-term durability.

  • What is Alkali-Activated Slag? NIUMAG Corporation

    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.

  • Alkali-activated materials - ScienceDirect

    In China, the standard GB/T 29423-2012 describes the use of alkali-activated materials for chemical resistance applications, and there is an extensive set of prescriptive standards for alkali-activated slag cements and concretes which has long been in place in Ukraine, Russia and other CIS nations derived from the work of the Glukhovsky ...

  • Cited by: 207
  • Alkali-activated slag concrete: Fresh and hardened ...

    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 water (5% Na 2 O by slag mass, SiO 2 /Na 2 O

  • Cited by: 22
  • What is the difference between geopolymer and alkali ...

    When it contants a lot amount of calcium materials, it is an alkali activated material, and you can do that with activated slag and get CASH phase. but activated low calcium content fly ash will ...

  • A Review of Durability and Strength Characteristics of ...

    Apr 12, 2019  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.

  • Cited by: 2
  • Hydration of Alkali-Activated Ground Granulated Blast ...

    In order to investigate the effect of temperature and pH on the early hydration rate of alkali-activated slag (AAS), NaOH was used as alkali activator, and the nonevaporable water (NEW) content of ...

  • Mitigation of Autogenous Shrinkage in Alkali Activated ...

    Nov 19, 2012  Alkali activated slag shows considerable promise as an environmentally friendly alternative to binders produced from ordinary portland cement (OPC). The shrinkage behavior of alkali activated slags, however, is not well understood, and is a hurdle to widespread adoption.

  • Mechanism of Alkali-Activated Copper-Nickel Slag Material

    A copper-nickel slag-based alkali-activated cementing material (CN) 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 CN were investigated using an electronic universal testing machine.

  • ALKALI ACTIVATED MATERIAL – GEOPOLYMER

    ALKALI ACTIVATED MATERIAL – GEOPOLYMER 661 ALKALI ACTIVATED MATERIAL – GEOPOLYMER František Škvára Department of Glass and Ceramics Faculty of Chemical Technology, ICT Prague Abstracts. Overview of the state-of-the-art on the alkali activated materials since 1973 in Department of Glass and Ceramics in Pra-gue.

  • Strength and Drying Shrinkage of Alkali-Activated Slag ...

    The aim of this study is to investigate the strengths and drying shrinkage of alkali-activated slag paste and mortar. Compressive strength, tensile strength, and drying shrinkage of alkali-activated slag paste and mortar were measured with various liquid/slag ratios, sand/slag ratios, curing ages, and curing temperatures. Experimental results show that the higher compressive strength and ...

  • The Characterization of Steel Slag by Alkali Activation

    This paper presents a characterization analysis of alkali-activated steel slag. The effect ratio of steel slag and ferronickel slag which are the precursor materials on the compressive strength of the alkali-activated materials was investigated. The combination of sodium hydroxide solution of 15 moles concentration and sodium silicate was used as an alkaline activator.

  • Thermal Properties of Alkali Activated Slag Plaster for ...

    Jan 20, 2020  The incorporation of PG in the alkali activated slag system changed the kinetic of reaction and promoted the formation of CSH in the alkali-activated slag system.

  • Frontiers Alkali Activated Slag Mortars Provide High ...

    The activator used in alkali-activated slag mortars was prepared by fully dissolving anhydrous sodium metasilicate powder (Sigma-Aldrich, Na 2 SiO 3) into distilled water, and allowing the solution to cool to room temperature.BFS was then activated by mixing this powder with a solution containing 7 g sodium metasilicate per 100 g BFS, at a water to total solids (slag + Na 2 SiO 3) mass ratio ...

  • Alkali activated cements (including geopolymer cements)

    All alkali-activated cements tend to have lower embodied energy/carbon footprints than Portland cements (up to 80-90% but this is pozzolan dependent). Manufacture on a commercial basis is underway in the UK, Australia, USA and possibly, China. Covered by PAS 8820:2016 Construction materials. Alkali activated cementitious material and concrete.

  • Geopolymers and Related Alkali-Activated Materials ...

    Alkali-activated materials (AAMs) (), including those classified as geopolymers (8, 9), are a high-profile example of the alternative binders now being discussed and developed with a view toward obtaining environmental savings in the construction industry; others include calcium aluminates, sulfoaluminates, supersulfated slag cements, and magnesium-based binders ().

  • Alkali-Activated Ground-Granulated Blast Furnace Slag for ...

    Apr 04, 2015  This paper investigated the stabilization efficacy of alkali-activated ground-granulated blast furnace slag (GGBS) for a marine soft clay, compared with that of portland cement (PC). The influence of activators, including NaOH, Na 2 CO 3, carbide slag (CS), NaOH-CS, Na 2 CO 3-CS, and Na 2 SO 4-CS, on the stabilization efficacy was investigated ...

  • The Potential of Ladle Slag and Electric Arc Furnace Slag ...

    1. Introduction. Alkali activation technology offers the possibility to utilize large amounts of aluminosilicate-rich secondary products such as fly ash from thermoplants [1,2,3], slag from metallurgical processes [4,5] and waste [] for a useful new group of building products.Steel slag-based alkali activated materials (AAM), have a high mechanical strength, show good fire resistance and ...

  • Effect of slag chemistry on the hydration of alkali ...

    Effect of slag chemistry on the hydration of alkali-activated blast-furnace slag Ricarda Ta¨nzer • Anja Buchwald • Dietmar Stephan Received: 22 April 2014/Accepted: 23 October 2014/Published online: 20 November 2014 The Author(s) 2014. This article is published with open access at Springerlink Abstract This paper presents results of ...

  • Durability Properties of Alkali Activated Slag Composites ...

    Jun 20, 2019  Despite the advances in studies utilizing industrial, construction and agricultural wastes as alternative materials for concrete making, there are still gaps to be covered on the durability characteristics of most materials. This study presents a shot overview on the durability properties of alkali-activated slag (AAS) composites. The durability properties of AAS explored include

  • Alkali-Activated Ground-Granulated Blast Furnace Slag for ...

    Apr 04, 2015  This paper investigated the stabilization efficacy of alkali-activated ground-granulated blast furnace slag (GGBS) for a marine soft clay, compared with that of portland cement (PC). The influence of activators, including NaOH, Na 2 CO 3, carbide slag (CS), NaOH-CS, Na 2 CO 3-CS, and Na 2 SO 4-CS, on the stabilization efficacy was investigated ...

  • The Potential of Ladle Slag and Electric Arc Furnace Slag ...

    1. Introduction. Alkali activation technology offers the possibility to utilize large amounts of aluminosilicate-rich secondary products such as fly ash from thermoplants [1,2,3], slag from metallurgical processes [4,5] and waste [] for a useful new group of building products.Steel slag-based alkali activated materials (AAM), have a high mechanical strength, show good fire resistance and ...

  • Effect of slag chemistry on the hydration of alkali ...

    Effect of slag chemistry on the hydration of alkali-activated blast-furnace slag Ricarda Ta¨nzer • Anja Buchwald • Dietmar Stephan Received: 22 April 2014/Accepted: 23 October 2014/Published online: 20 November 2014 The Author(s) 2014. This article is published with open access at Springerlink Abstract This paper presents results of ...

  • Durability Properties of Alkali Activated Slag Composites ...

    Jun 20, 2019  Despite the advances in studies utilizing industrial, construction and agricultural wastes as alternative materials for concrete making, there are still gaps to be covered on the durability characteristics of most materials. This study presents a shot overview on the durability properties of alkali-activated slag (AAS) composites. The durability properties of AAS explored include

  • Microstructural Changes Induced by CO2 Exposure in Alkali ...

    Sep 16, 2016  The structural changes induced by accelerated carbonation in alkali-activated slag/metakaolin (MK) cements were determined. The specimens were carbonated for 540 h in an environmental chamber with a CO2 concentration of 1.0 ± 0.2%, a temperature of 20 ± 2°C, and relative humidity of 65 ± 5%. Accelerated carbonation led to decalcification of the main binding phase of these

  • Thermodynamic modelling of alkali-activated slag cements

    1 Thermodynamic modelling of alkali-activated slag 2 cements 3 4 Rupert J. Myers 1, Barbara Lothenbach 2, Susan A. Bernal 1, 5 John L. Provis 1* 6 ... 46 of alkali-activated slag (AAS) cements (Provis and Bernal, 2014). The reactive component of blast

  • Shrinkage Characteristics of Alkali-Activated Slag Cements ...

    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 Review on the Durability of Alkali-Activated Fly Ash ...

    CO2 binding capacity of alkali-activated fly ash and slag pastes. Ceramics International 2018, 44 (16) , 19646-19660. DOI: 10.1016/j.ceramint.2018.07.216. Marija Nedeljković, Zhenming Li, Guang Ye. Setting, Strength, and Autogenous Shrinkage of Alkali-Activated Fly Ash and Slag Pastes: Effect of Slag

  • (PDF) Performance of Alkali Activated Slag and Alkali ...

    Performance of Alkali Activated Slag and Alkali Activated Slag + Fly Ash with various Alkali Activators

  • Effect of Carbonation on Alkali‐Activated Slag Paste ...

    This may be attributed to the fact that in Portland cement paste both the portlandite and the C–S–H gel can be carbonated, whereas in alkali‐activated slag pastes, only the C–S–H gel is carbonated directly. In both systems, carbonation leads to the formation of CaCO 3, Si‐rich C–S–H gel, silica gel, and alumina. The carbonation ...

  • of Alkali-Activated Slag Concrete - MDPI

    Compressive strength development of 16 mm 16 mm 160 mm alkali-activated slag (AAS) mortar samples activated using water compared to potassium hydroxide [3]. 2.2. Hydration Products of Alkali-Activated Slag AAS hydration products form at the

  • Alkali-Activated Slag Cements as a Sustainable Building ...

    The production of alkali-activated slag cements would require little fossil fuel, reducing pollutants and increasing domestic energy independence, while increasing demand for an industrial waste product, helping build prosperity, and reducing the need for landfills.

  • Alkali Activated Slag And Portland/Slag Ultrafine Cement ...

    Ultrafine Alkali Activated Slag (AAS) and Portland/Slag (P/S) cements have been commercially available in the United States for 2 and 5 years, respectively. Ultrafine cements have been the subject of research at Northwestern University for 6 years.

  • Enhanced characteristics of alkali activated slag/ grog ...

    alkali activator and curing at 60 . o. C for 48 hours. They were able to develop steel slag Geopolymer with a compressive strength of 10.5 MPa. Radhakrishna et al. [4], investigated the production of Geopolymer bricks based on a blend of fly ash and blast furnace slag. He used sodium based alkali

  • of Alkali-Activated Slag Concrete - MDPI

    Compressive strength development of 16 mm 16 mm 160 mm alkali-activated slag (AAS) mortar samples activated using water compared to potassium hydroxide [3]. 2.2. Hydration Products of Alkali-Activated Slag AAS hydration products form at the

  • Alkali-Activated Slag Cements as a Sustainable Building ...

    The production of alkali-activated slag cements would require little fossil fuel, reducing pollutants and increasing domestic energy independence, while increasing demand for an industrial waste product, helping build prosperity, and reducing the need for landfills.

  • Alkali Activated Slag And Portland/Slag Ultrafine Cement ...

    Ultrafine Alkali Activated Slag (AAS) and Portland/Slag (P/S) cements have been commercially available in the United States for 2 and 5 years, respectively. Ultrafine cements have been the subject of research at Northwestern University for 6 years.

  • Enhanced characteristics of alkali activated slag/ grog ...

    alkali activator and curing at 60 . o. C for 48 hours. They were able to develop steel slag Geopolymer with a compressive strength of 10.5 MPa. Radhakrishna et al. [4], investigated the production of Geopolymer bricks based on a blend of fly ash and blast furnace slag. He used sodium based alkali

  • Flow Property of Alkali-Activated Slag with Modified Precursor

    This study investigates the influence of the precursor modification on the retardation of flow loss in alkali-activated slag (AAS). The blast-furnace slag precursor was modified by using a modifying solution incorporating NaOH or water (Na2SiO3) to suppress the dissolution rates of the main reaction components such as Ca, Si, Mg, and Al.

  • Geopolymer cement - Wikipedia

    Nevertheless, several cement scientists continue to promote the terminology related to alkali-activated materials or alkali-activated geopolymers. These cements, abbreviated AAM, encompass the specific fields of alkali-activated slags, alkali-activated coal fly ashes , and various blended cementing systems (see RILEM Technical committee 247-DTA).

  • Durability of Alkali-Activated Slag Cement in Seawater ...

    The durability of alkali-activated slag mortar in seawater environment, compared with that of ordinary portland cement mortar, was studied by drying-wetting test in accelerated laboratory seawater. The drying-wetting resistance, porosity, performance mechanism, and depth of chloride ingress were analyzed. The results show the mechanical properties of the AAS mortars were improved after 40 ...

  • Durability of alkali-activated fly ash and slag concrete ...

    Corpus ID: 73629676. Durability of alkali-activated fly ash and slag concrete @inproceedings{Ghanmi2016DurabilityOA, title={Durability of alkali-activated fly ash and slag concrete}, author={Khouloud Ghanmi and Marija Nedeljkovi{\'c}

  • Alkali-Activated Fly Ash and Slag Pastes: Effect of Slag ...

    electricity production and ground granulated blast-furnace slag (GBFS) from steel production [10]. The extent of replacement of OPC is limited by the composition and reactivity of the s [9]. In fact, FA and GBFS can completely replace OPC by taking advantage of alkali activation [4]. In this case, alkali activated materials (AAMs) are ...

  • Alkali-activated binders: A review Part 1. Historical ...

    A large part of the investigations about alkali-activated binders is related to the activation of blast furnace slag, known as ‘‘Alkali-slag cement’’ or ‘‘Alkali-activated slag cement’’. Blast furnace slag is a by-product of iron produc-tion industry, having a high content of calcium which is

  • HYDRATION CHARACTERISTICS OF ALKALI-ACTIVATED

    Hydration Characteristics of alkali–activated slag cement (AASC) are different of those of ordinary Portland cement. Effects of activator type, modulus of water (WG), and Na2O equivalent on setting time, compressive strength, hydration heat and hydration products were studied.

  • A Review on the Durability of Alkali-Activated Fly Ash ...

    Waste as partial mineral precursor in alkali-activated slag/fly ash system. Cement and Concrete Research 2017, 102, 29-40. DOI: 10.1016/j.cemconres.2017.08.012. N. Džunuzović, M. Komljenović, V. Nikolić, T. Ivanović. External sulfate attack on alkali-activated fly ash-blast furnace slag composite.

  • Low Temperature Calorimetry and Alkali-Activated Slags

    inside the pavements. Alkali-activated slags (AAS) are produced from ground granulated blast furnace slag (GGBFS), a byproduct of iron production, and exhibit cementitious properties. AAS concretes have been shown to have improved corrosion and freeze/thaw resistance compared to traditional cement-based concretes.

  • International Journal of Innovative Research in Science ...

    The performance of alkali-activated slag concrete with sodium silicate, sodium hydroxide, sodium carbonate as activator are used at 4% Na 2 O(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

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    The materials of processing: *

    • Granite
    • Limestone
    • Basalt
    • Pebble
    • Gravel
    • Gypsum
    • Marble
    • Barite
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    • Dolomite
    • Gold Ore
    • Copper ore
    * *

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