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alkali activated slag


Performance of alkali activated slag concrete under ...

activated by alkali solutions, termed geopolymer concrete. Concrete made with PC can be durable under mild exposure condition when properly designed, but it undergoes deterioration under severe exposure condition. Since very few works were performed on the ambient cured Alkali Activated Slag Concrete (AASC) under aggressive environmental

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

Mechanical and chemical characterization of alkali-activated slag cements will be performed using standard methods (as defined either by ASTM or common practice in the literature.) Practical uses of these materials will be demonstrated via prototype structural elements and the data will be disseminated via refereed journal articles.

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 waterglass (Na2SiO3) to suppress the dissolution rates of the main reaction components such as Ca, Si, Mg, and Al.

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.

Geopolymer cement - Wikipedia

The development of so-called alkali-activated-cements or alkali-activated geopolymers (the latter considered by some to be incorrect terminology), as well as several recipes found in the literature and on the Internet, especially those based on fly ashes, use alkali silicates with molar ratios SiO 2:M 2 O below 1.20, or systems based on pure ...

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

Alkali-activated materials (AAMs) have high potential as alternative binder to ordinary portland cement (OPC), because of their high performance beside lower CO 2 emissions. While there is a general consensus about their strength advantages over OPC, there is …

Alkali-Activated Blast furnace Slag as a Green ...

Alkali-activated slag (AAS). An attempt has been made to manufacture Alkali-Activated Slag composites which can be considered as a Green construction material. The paper presents the effect of curing conditions on engineering properties such as Water absorption, Apparent porosity and Compressive strength of AAS pastes.

Influence(of(Nucleation(Seeding(on(the(Compressive ...

Portland cement. Similarly, it may be activated by the addition of alkalis to form alkali-activated slag paste to increase the rate of dissolution of the glassy phases in the slag. It is expected that C-S-H with a low Ca/Si ratio forms upon hydration of the slag since the Ca/Si ratio of slag …

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.

Final Report | Alkali-Activated Slag Cements as a ...

Applied science has been used to guide the development of viable alternative cements. Long term, this would enable the use of many slags and fly ashes as alkali-activated cements by providing the critical link between component chemistry and the proper mix design using those components to achieve the desired bulk performance.

A review: The comparison between alkali-activated slag (Si ...

There are two main models of alkali-activated cements, one is the case of the activation of slag (Si + Ca) and the other is activation of metakaolin (Si + Al).This paper reviews current knowledge about the comparison between alkali-activated slag (Si + Ca) and metakaolin (Si + Al) cements, including the general properties of slag and metakaolin, hydration products reaction mechanisms, and the ...

Alkali activated slag-fly ash binders - Pure - Aanmelden

Alkali activated slag-fly ash binders: design, modeling and application PROEFSCHRIFT ter verkrijging van de graad van doctor aan de Technische Universiteit Eindhoven, op gezag van de rector magnificus, prof.dr.ir. F.P.T. Baaijens, voor een commissie aangewezen door het College voor Promoties in het openbaar te verdedigen

Alkali Activated Systems - ASU Digital Repository

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 by Ussala Chowdhury A Thesis Presented in Partial Fulfillment of the Requirements for the Degree Master of Science Approved July 2013 by the

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

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 ...

Chloride transport and the resulting corrosion of steel ...

Chloride transport and the resulting corrosion of steel bars in alkali activated slag concretes Qianmin Ma . Sreejith V. Nanukuttan . P. A. Muhammed Basheer . Yun Bai . Changhui Yang Received: 29 June 2015/Accepted: 23 November 2015/Published online: 18 December 2015 The Author(s) 2015. This article is published with open access at Springerlink.com

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 ...

Alkali-Activated Slag Mortars - mdpi.com

Alkali-activated material is a new eco-friendly green building material. Using industrial solid wastes (fly ash, slag, steel slag, etc.) as raw materials to react with alkaline activator solution, the preparation process of alkali-activated cementitious material is simple, featured by no firing

Determination of the Surface Properties of Alkali ...

Alkali-Activated Slag. Another purpose was to determine the variation in adsorption thermodynamic parameters of some hydrocarbons on Alkali-Activated Slag. II. MATERIALS AND ETHODS A. Materials The ground granulated blast furnace slag as a precursor for alkali …

Schedule | Slag Valorisation Symposium

Apr 01, 2019· Alkali activated foams from slag. Bram Mast – Hasselt Univerisity. Mechanical and microstructural properties of inorganic polymers in a gamma radiation field. Hiromichi Takebe – Ehime University. Temperature and composition dependences of viscosity for FeOx-SiO2 slag melts under magnetite formation control.

Effect of Reactive Magnesium Oxide on Properties of Alkali ...

the type and content of the alkali activators (Shi 1996; Shi and Day 1996), properties of the aggregate and the slag (Cincotto et al. 2003), as well as curing environment (Hikkinen 1993; Li and Sun 2000). In general, water–glass activated slag has more shrinkage than sodium hydroxide activated slag and the drying shrinkage of AAS

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

FTIR Analysis of Alkali Activated Slag and Fly Ash Using Deconvolution Techniques by Sateesh Babu Madavarapu A Thesis Presented in Partial Ful llment of the Requirement for the Degree Master of Science Approved July 2014 by the Graduate Supervisory Committee: Narayanan Neithalath, Chair Subramaniam Rajan Robert Marzke ARIZONA STATE UNIVERSITY ...

Factors Affecting the Strength of Alkali-Activated Slag ...

Alkali silicate-activated ground granulated blast furnace slag (AAS) can develop high strength but is usually accompanied by fast setting [1]. Numerous studies have discussed the influence of slag ...

Alkali Activated Materials are NOT Geopolymers - Part 1 ...

Jul 16, 2014· In this first part, Prof. J. Davidovits explains the main differences between AAC —Alkali-Activated Cement or Concrete—, AAS —Alkali-Activated Slag—, AAF —Alkali-Activated Fly Ash— and ...

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

The behaviour of fresh and hardened alkali-activated slag (AAS) and OPC concretes was compared and the effect of mixing time assessed. OPC and AAS concrete slump and rheological results proved to differ, particularly when the slag was activated with waterglass (WG).

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

Nov 20, 2014· Sodium hydroxide (NaOH) and two potassium silicate solutions with molar water glass modules (SiO 2 /M 2 O) of 1 and 2 were used as alkaline activators (Table 3).Furthermore a water/slag-ratio of 0.35 was defined for all alkali-activated binders to allow a comparability between them, because of the different solid contents of the alkaline solutions used.

A model for the CASH gel formed in alkali-activated slag ...

Introduction however, that AAS cements and concretes carbonate more read- ily than OPCs, and that one of the chief technological problems Alkali-activated slag (AAS) cement development has been posed by these alkaline materials when waterglass is the activat- the object of much research in recent years because of the ing solution is their high ...

Stabilization of Lithomargic Soil Using Alkali Activated ...

Stabilization of Lithomargic Soil Using Alkali Activated Fly-Ash with GGBS International Journal of Constructive Research in Civil Engineering (IJCRCE) Page | 21 3.3. Fly Ash Fly ash is a waste product obtained from the burning of coal. In the present work it was collected

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.

Carbonation Characteristics of Alkali-Activated Blast ...

Alkali-activated ground granulated blast-slag (AAS) is the most obvious alternative material for ordinary Portland cement (OPC). However, to use it as a structural material requires the assessment and verification of its durability. The most important factor for a durability evaluation is the degree of carbonation resistance, and AAS is known to show lower performance than OPC.

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