Comparison of alkali and silica sources in one-part alkali-activated blast furnace slag mortar

Luukkonen, Tero; Abdollahnejad, Zahra; Yliniemi, Juho; Kinnunen, Päivö; Illikainen, Mirja

doi:10.1016/j.jclepro.2018.03.202

Cited by 196 publications

(86 citation statements)

References 40 publications

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“…The binder consists of GGBFS and sodium metasilicate (molar ratio of SiO 2 /Na 2 O ≈ 0.9, water content 2.5%). The ingredients of the mixed design were based on [17]. The content of the GGBFS was 90% of the total mass, and the other 10% was assigned to sodium metasilicate.…”

Section: Materials and Mixed Designmentioning

confidence: 99%

“…A constant water to binder ratio of 0.45 was used in all mixtures. In [17], a constant water to binder ratio of 0.35 was used for the plain alkali activated mortars. Since in this paper, different fibers were used to reinforce the mixtures, the content of water was increased to provide good flowability and have fully dispersed fibers in fresh mortars.…”

Section: Materials and Mixed Designmentioning

confidence: 99%

“…Combination of the benefits of one-part alkali-activated materials and GGBFS as the main precursor resulted in the development of one-part alkali-activated slag binders [16][17][18][19]. Similar to other cementitious compositions, the plain AASs suffer from brittleness under flexural and tensile loadings.…”

Section: Introductionmentioning

confidence: 99%

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Durability of the Reinforced One-Part Alkali-Activated Slag Mortars with Different Fibers

Abdollahnejad

Mastali

Falah

et al. 2020

Waste Biomass Valor

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This paper investigates the effects of reinforcing one-part alkali-activated slag binders (OAASs) with different types of fiber (steel, polyvinyl alcohol [PVA], basalt, and cellulose) and fiber combinations (single and hybrid) on the mechanical and durability properties of OAASs. All OAASs were reinforced by a 1% fiber volume fraction. Compressive and flexural strengths were the mechanical properties, which were addressed. The durability of the reinforced OAASs was examined based on water absorption by immersion and capillary, acid resistance, high temperature resistance, carbonation resistance, and freeze/thaw resistance. The experimental results showed that the fiber type and combination greatly affects the mechanical and durability properties of OAASs. Moreover, the influence of fiber type and combination on high temperature resistance and freeze/thaw resistance is greater than the influence on acid resistance and carbonation resistance. Graphic AbstractKeywords One-part alkali activated binders · Fiber reinforced mortars · Mechanical and durability properties · Fiber type · Fiber combination * Z. Abdollahnejad

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Section: Materials and Mixed Designmentioning

confidence: 99%

Section: Materials and Mixed Designmentioning

confidence: 99%

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Durability of the Reinforced One-Part Alkali-Activated Slag Mortars with Different Fibers

Abdollahnejad

Mastali

Falah

et al. 2020

Waste Biomass Valor

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“…Concerning ceramic waste types and contents, five different compositions were designed, for which the mixture designations and proportions are provided in Table 2. The reference mix composition in Table 2 was chosen based on the investigations Luukkonen et al [9]. Regarding the usage of three different curing regimes, in total 45 prismatic beams for assessing the flexural strength were cast and tested based on the ASTM C116-90 recommendation [46].…”

Section: Specimen Synthesis and Ageingmentioning

confidence: 99%

“…As mentioned earlier, different precursors are used for the preparation of alkali-activated binders such as industrial by-products, including granulated blast furnace slag (derived from the steel making industry), fly ash (derived from coal or biomass combustion), and clays (metakaolin) [7,8]. Recently, various efforts have been made to use natural pozzolans in alkali activated binders [9,10].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Analysis and Strength Development of One-Part Alkali-Activated Slag/Ceramic Binders Under Different Curing Regimes

Abdollahnejad

Luukkonen

Mastali

et al. 2019

Waste Biomass Valor

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Alkali-activated binders have shown great potential in the reuse of industrial waste materials and have therefore received significant attention. The use of one-part or a "just-add-water" alkali-activated binder aims to avoid the use of alkali-activator solutions which have traditionally been utilized in two-part systems. By using a solid activator, the disadvantages posed by hazardous liquid activators (such as the difficulties of using them on-site) can be minimized. Ceramic materials represent a considerable fraction of construction and demolition wastes, and originate not only from the building process, but also as tiles from industry and rejected bricks. Besides using these waste materials as road sub-base or construction backfill materials, they can also be employed as supplementary cementitious materials or even as raw material for alkali-activated binders. This paper presents the strength development and microstructural results obtained from examining different compositions under various curing conditions (sealing, ambient, and submerged in water). Two different ceramic wastes (with and without firing) were used as a partial replacement (5-10% by mass) of ground granulated blast-furnace slag. Specimens were then cured under three different curing regimes, including: (1) plastic-sealed, (2) unsealed at ambient conditions with an average temperature of 23 °C and 35% RH, and (3) submerged in water until the test date. Mechanical testing (compressive and flexural strengths) and microstructural analysis (SEM/EDX, XRD, MIP, heat of hydration, TGA, and DTA) were used to determine the effects of curing conditions. The results showed that ceramic waste content and type, as well as curing regimes, greatly affect the chemical reaction products, strength development, and structural stability. Keywords One-part alkali-activated binders • Ceramic wastes • Curing conditions • Mechanical properties Statement of Novelty This paper presents the effects of using three different curing conditions (sealed, ambient, and submerged in water) on strength development at early and final ages and the microscopic analysis of one-part alkali-activated slag/ceramic binders. Moreover, a comparative study is conducted on partial replacement of ground granulated blast-furnace slag by two different ceramic wastes as a binder type.

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Ceramic Production Methods and Basic Characterization Techniques

Panigrahi

Ganguly

Dash

2023

High Electrical Resistance Ceramics

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Comparison of alkali and silica sources in one-part alkali-activated blast furnace slag mortar

Cited by 196 publications

References 40 publications

Durability of the Reinforced One-Part Alkali-Activated Slag Mortars with Different Fibers

Durability of the Reinforced One-Part Alkali-Activated Slag Mortars with Different Fibers

Microstructural Analysis and Strength Development of One-Part Alkali-Activated Slag/Ceramic Binders Under Different Curing Regimes

Ceramic Production Methods and Basic Characterization Techniques

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