Rheology behavior of one-part alkali activated slag/glass powder (AASG) pastes

Li, Long; Lü, Jian; Zhang, Binyu; Poon, Chi Sun

doi:10.1016/j.conbuildmat.2020.120381

Cited by 74 publications

(39 citation statements)

References 51 publications

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“…The yield stress decreased with the increase of AS/B ratio from 0.14 to 0.22 ( Figure 7 ). A similar effect has been observed by Li et al [ 10 ] when the alkaline content to binder ratio was increased from 0.1 to 0.2 on a one-part alkali-activated slag. Zhang et al [ 15 ] also observed a decrease in both yield stress and plastic viscosity as the alkaline content increased.…”

Section: Resultssupporting

confidence: 86%

“…Interest in the rheological behaviors of AAC systems is increasing as the mortar and concrete based on this binder are considered for various applications [ 10 , 11 , 12 ]. The fresh AAC mixture is a solid-liquid suspension system and its rheology depends on various parameters such as type and amount of source materials and activators used, chemical admixtures, temperature, solid contents, water content, and so on [ 12 , 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

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Rheology of Alkali-Activated Blended Binder Mixtures

2021

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Alkali-activated cement (AAC) is an alternative cement that has been increasingly studied over the past decades mainly because of its environmental benefits. However, most studies are on heat-cured AACs and are focused on mechanical properties. There is a lack of research on the fresh properties of ambient-cured AAC systems. This study investigates the rheological properties of ambient-temperature-cured alkali-activated blended binder mixtures activated with sodium silicate and sodium hydroxide solutions. The influence of binder amount, alkaline solid to binder ratio (AS/B), sodium silicate to sodium hydroxide solids ratio (SS/SH), and total water content to total solid (from the binding materials) ratio (TW/TS) on the rheological properties are investigated. The effect of borax as an admixture and silica fume as a replacement for fly ash is also investigated. The results showed that both the yield stress and plastic viscosity are mainly affected by the binder content and TW/TS ratio decreasing with the increase of each parameter. The yield stress increased with the increase of the SS/SH ratio. Borax significantly reduced the yield stress, while silica fume’s effect was dependent on its dosage.

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Rheology of Alkali-Activated Blended Binder Mixtures

2021

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“…Alonso et al [ 58 ] obtained consistency between 140 and 160 mm using alkali-actived mortars with the ratio 1:2 (binder:sand), varying the content of solids in the mortar. Li et al [ 61 ] obtained results of consistency between 150 and 185 mm, using mortars based on fly ash and BFS. Rajaei et al [ 59 ] obtained similar results, indicating that the results obtained in Figure 2 with a consistency index between 146 and 195 mm are consistent.…”

Section: Resultsmentioning

confidence: 99%

Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

100

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The fresh and rheological properties of alkali mortars activated by blast furnace slag (BFS) were investigated. Consistency tests, squeeze flow, dropping ball, mass density in the hardened state, incorporated air, and water retention were performed. Mortars were produced with the ratio 1:2:0.45 (binder:sand:water), using not only ordinary Portland cement for control but also BFS, varying the sodium content of the activated alkali mortars from 2.5 to 15%. The results obtained permitted understanding that mortars containing 2.5 to 7.5% sodium present a rheological behavior similar to cementitious mortars by the Bingham model. In turn, the activated alkali mortars containing 10 to 15% sodium showed a very significant change in the properties of dynamic viscosity, which is associated with a change in the type of model, starting to behave similar to the Herschel–Bulkley model. Evaluating the properties of incorporated air and water retention, it appears that mortars containing 12.5% and 15% sodium do not have compatible properties, which is related to the occupation of sodium ions in the interstices of the material. Thus, it is concluded that the techniques used were consistent in the rheological characterization of activated alkali mortars.

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“…Different source materials are known to consume different amounts of alkali [19]. At lower AS/B ratios, the strength increases with the increase of the ratio; however, after an optimum level for that specific source material is attained, strength decreases with the increase of the ratio [30,31]. In G52M30S18-1 to 3 mixes, the compressive strength first increased when the AS/B increased from 0.25 to 0.29 and then decreased as AS/B further increased to 0.33.…”

Section: Effect Of Alkaline Solutionmentioning

confidence: 99%

Mechanical Behavior and Frost-Resistance of Alkali-Activated Cement Concrete with Blended Binder at Ambient Curing Condition

et al. 2021

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Concrete is the most commonly used construction material because of its various advantages, such as versatility, familiarity, strength, and durability, and it will continue to be in demand far into the future. However, with today’s sensitivity to environmental protection, this material faces unprecedented challenges because of its high greenhouse gas emissions, mainly during cement production. This paper investigates one of the promising cement replacement materials, alkali-activated cement (AAC) concrete. Being produced mainly from byproduct materials and having a comparable structural performance to conventional concrete, AAC concrete can transform the construction industry. Mechanical properties such as compressive and flexural strength and the relationship between them are studied. Different source materials such as fly ash (FA), ground granulated blast furnace slag (GGBS), silica fume (SF), and Metakaolin (MK) are used. The effect of the source materials and the activator solutions on the concrete performance is studied. Furthermore, the freeze-thaw resistance of the concrete is studied. The study results showed that the behavior of AAC depends highly on the source material combinations and type used. The effect of the alkaline solution is also dependent on the source material used. Mixes with higher GGBS content showed the highest strength, while mixes with MK showed the highest flexural strength. The freeze-thaw test results showed that proper design of AAC concrete with lower water content is critical to achieving a good resistance.

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Rheology behavior of one-part alkali activated slag/glass powder (AASG) pastes

Cited by 74 publications

References 51 publications

Rheology of Alkali-Activated Blended Binder Mixtures

Rheology of Alkali-Activated Blended Binder Mixtures

Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag

Mechanical Behavior and Frost-Resistance of Alkali-Activated Cement Concrete with Blended Binder at Ambient Curing Condition

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