A review on alkali-activated slag concrete

The most commonly cementitious materials that utilized for alkali activated concrete-related research are GGBFS, FA, Silica fume and Metakaolin (burnt clay). Fig. …

Hydration and Properties of Slag Cement Activated by Alkali …

The sulfate ions from sulfates would react with Ca 2 + from slag cement and form the reaction product ettringite. However, the addition of sodium hydroxide seems …

A review: Alkali-activated cement and concrete production …

Thereafter, the wet alkali-activated concrete should be protected during the hardening and curing period to avoid moisture loss. This procedure is the same for …

Steel slag for carbon fixation and synthesis of alkali …

1. Introduction. Steel slag (SS) is the by-product of steel manufacturing process, with a generation approximate 10–15 % of crude steel capacity [1].According to the World Steel Association, global crude production is 1.95 billion tons in 2021, and the associated SS production is around 200 million tons [2].SS is typically rich in Ca, Fe, Si, …

Comparing the Carbonation Performances of a Low-Clinker Blended Slag

However, in most cases, the alkali-activated slag cement can achieve higher strength performances, between 40–60 MPa, while the CEM III is normally at the 32.5N strength class. The higher strength performances of alkali-activated slag system, comparing to the high-GGBFS blended system, might be attributed to higher degree of …

Slag cement

Heidelberg Materials Slag Cement does not affect air entrainment and improves slump retention in properly engineered concrete mixes. It is often used in mass concrete, at …

Resistance of alkali-activated slag concrete to carbonation

This paper presents an investigation into durability of alkali-activated slag (AAS) concrete exposed to carbonation. Two tests were used which simulated exposure of AAS concrete to carbonated solution and to atmosphere high in carbon dioxide. These tests involved immersion of the concrete in 0.352 M sodium bicarbonate solution, and …

Shrinkage mitigation of alkali-activated slag with natural …

Enhancing the properties and performance of green alternatives to ordinary Portland cement is now a significant challenge for many researchers. Alkali-activated slag (AAS) is a promising alternative because it has good durability and is both cost-effective and eco-friendly. However, high shrinkage limits the adoption of AAS. This paper investigates …

Mechanical properties and durability of alkali-activated steel slag …

Alkali-activated cement (AAC) is either clinker-less or free, and it is also environmentally friendly due to its low carbon footprint and wide range sources. Industrial wastes, like steel slag and blastfurnace slag, usually have latent hydraulic reactivity, and can be used as precursors of AAC. Both clinkerless and clinker-free AAC were prepared …

Setting of alkali-activated slag cement. Influence of …

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. For this purpose three different activators were used: waterglass (Na2SiO2.nHaOH with a SiO2/NaO ratio equal 1·5), NaOH and Na2CO3. The …

Development of greener alkali-activated cement

Alkali activated fly ash/slag (AAFS), a newly evolved type of alkali-activated cements (AACs), is here studied with the aim of developing a more sustainable alternative to Portland cement (PC), known for its adverse environmental impact. In this study, sodium carbonate (Na 2 CO 3) was used as the alkali activator for the fly ash (FA)/slag ...

Drying shrinkage of one-part alkali-activated slag concrete

Abstract. The aim of this study was to evaluate the drying shrinkage of one-part alkali-activated slag concrete (AASC) for up to 180 days that is influenced by mix design parameters. A total of 24 mix designs for AASC and one for OPC concrete were made and cured in two different environments. The impacts of mix design parameters including …

Effect of Alkali and Sulfate on the Hydration …

Coal gasification slag is an inevitable by-product of the coal gasification process. This paper explored the feasibility of using activators (calcium hydroxide, sodium hydroxide, calcium sulfate, sodium sulfate) …

Info Sheets | SCA

The Slag Cement Association has published 30 information sheets in the Slag Cement in Concrete series. These are listed below in numeric order. ... Alkali Silica Reaction …

Workability and mechanical properties of alkali activated slag concrete

The major advantages of slag replacement of OPC in making concrete is the superior durability and lower heat of hydration as compared to OPC binder. However, the low early strength of these concretes is a limitation in many applications. The problem of low early strength can be overcome by using alkali activated slag (AAS) as the type of ...

233R-17: Guide to the Use of Slag Cement in Concrete …

The use of slag cement as a cementitious material dates back to 1774, when a mortar was made using slag cement in combination with slaked lime (Mather 1957). In 1862, a ...

Shrinkage Behavior of Alkali-Activated Slag …

The results showed that the chemical shrinkage, autogenous shrinkage and drying shrinkage at 28 days were between 0.064 – 0.074 ml/g, 4.5 – 7.9 mm/m and 3.3 – 4.9 mm/m, respectively. The ...

Micromechanical properties of alkali-activated slag cement …

1. Introduction. The activation of steelmaking slag to form a cement-like binder was first demonstrated in 1908 [1].By 1940, Purdon [2] had published the results of an extensive experimental study on the subject.Since that time, tremendous advances have been made in the field of alkali activation, mainly due to the significant potential impact …

Influence of environmental stresses on the durability of slag …

2.2.1. Sample preparation. Depending on the intended application, two methods have been suggested for soil improvement using alkali-activated cement: 1) one-phase method, in which a mixture of the activator solution with aluminosilicate source (as mortar) is added to the soil (Sargent et al., 2013), 2) two-phase method involves initially …

Cracking tendency of alkali-activated slag concrete …

Equipment; Projects; Outputs; Prizes; Activities; Press/Media; Search by expertise, name or affiliation. Cracking tendency of alkali-activated slag concrete subjected to restrained shrinkage. ... Cracking tendency of alkali-activated slag concrete subjected to restrained shrinkage. Cement and Concrete Research, 30(5), 791 - 798.

(PDF) Alkali-Activated Slag Cement Concrete: A closer look …

It was found that the hydrotalcite-like phase is a major binder of alkalis in hydrated slag cement paste, and the C–S–H has weaker alkali-binding capacity than the C–S–H in hydrated ...

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

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.

[PDF] PREPARATION AND PROPERTIES OF ALKALI-ACTIVATED CEMENT …

Phosphorous slag is an industrial waste which potentially pollutes environments. The aim of the present work is to use phosphorous slag as a raw material to produce alkali-activated cement. The influence of mix proportion of phosphorous slag and fly ash, alkali content and modulus of water glass on the properties of alkali-activated …

Mechanical properties and durability of alkali-activated …

slag could improve the 3D concrete properties of geopolymer due to the increased alkalinity of the reaction system, and the optimum content of steel slag was 10%. …

Damage evolution, brittleness and solidification mechanism of cement …

This study explored the effects of the modulus and cement, GGBS, and alkali activator contents on the deformation and failure process of solidified soil through the mix proportion listed in Table 1.The alkali activator was prepared using Na 2 SiO 3 and NaOH. The cement content was calculated as the ratio of cement quality to the sum of cement …

Research Progress on Carbonation Resistance of Alkali-Activated Slag

In order to study the effects of carbonation behavior of alkali-activated cementitious material on drying shrinkage, alkali-activated slag cement stone (AASS) specimen of φ27.5×50mm was prepared ...

Corrosion resistance of alkali-activated slag cement

This paper examines the corrosion of alkali-activated blast furnace slag cement in pH 3 nitric acid, pH 3 acetic acid, 30% CaCl2 solution and 15% CO2 atmosphere at relative humidity of 52%. ASTM ...