Mechanical and acoustic properties of fiber-reinforced alkali-activated slag foam concretes containing lightweight structural aggregates

Mastali, Mohammad; Kinnunen, Päivö; Isomoisio, Heikki; Karhu, Marjaana; Illikainen, Mirja

doi:10.1016/j.conbuildmat.2018.07.228

Cited by 112 publications

(38 citation statements)

References 22 publications

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“…Furthermore, the inclusion of hybrid fibres in FC showed good workability [ 182 ] and recorded a great value of toughness index. The concrete mechanical properties for monofilament and staple fibres of hybrid polypropylene was investigated [ 183 ] and found an improvement from single fibre application [ 184 ] where staple fibres can reduce initial cracks with its good fineness and dispersion [ 31 ].…”

Section: Properties Of Frfcmentioning

confidence: 99%

Fibre-Reinforced Foamed Concretes: A Review

et al. 2020

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Foamed concrete (FC) is a high-quality building material with densities from 300 to 1850 kg/m3, which can have potential use in civil engineering, both as insulation from heat and sound, and for load-bearing structures. However, due to the nature of the cement material and its high porosity, FC is very weak in withstanding tensile loads; therefore, it often cracks in a plastic state, during shrinkage while drying, and also in a solid state. This paper is the first comprehensive review of the use of man-made and natural fibres to produce fibre-reinforced foamed concrete (FRFC). For this purpose, various foaming agents, fibres and other components that can serve as a basis for FRFC are reviewed and discussed in detail. Several factors have been found to affect the mechanical properties of FRFC, namely: fresh and hardened densities, particle size distribution, percentage of pozzolanic material used and volume of chemical foam agent. It was found that the rheological properties of the FRFC mix are influenced by the properties of both fibres and foam; therefore, it is necessary to apply an additional dosage of a foam agent to enhance the adhesion and cohesion between the foam agent and the cementitious filler in comparison with materials without fibres. Various types of fibres allow the reduction of by autogenous shrinkage a factor of 1.2–1.8 and drying shrinkage by a factor of 1.3–1.8. Incorporation of fibres leads to only a slight increase in the compressive strength of foamed concrete; however, it can significantly improve the flexural strength (up to 4 times), tensile strength (up to 3 times) and impact strength (up to 6 times). At the same time, the addition of fibres leads to practically no change in the heat and sound insulation characteristics of foamed concrete and this is basically depended on the type of fibres used such as Nylon and aramid fibres. Thus, FRFC having the presented set of properties has applications in various areas of construction, both in the construction of load-bearing and enclosing structures.

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Section: Properties Of Frfcmentioning

confidence: 99%

Fibre-Reinforced Foamed Concretes: A Review

et al. 2020

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“…According to the successful usage of alkali activation technology in low-alumina mine tailings to produce sustainable construction materials, it is also proposed to use these materials in the production of lightweight thermal and acoustic panels. These materials use the combined advantages of alkali-activated binders, lightweight, good thermal resistance, and high sound absorption [59][60][61][62][63][64][65][66][67][68].…”

Section: Water Absorptionmentioning

confidence: 99%

Effects of Activator Properties and Curing Conditions on Alkali-Activation of Low-Alumina Mine Tailings

Falah

Obenaus-Emler

Kinnunen

et al. 2019

Waste Biomass Valor

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The mining industry generates a notable amount of mine tailings (MTs). Disposal of MTs creates environmental impacts such as air pollution and the release of heavy metals into surface and underground water. The European Union (EU)-funded project "Integrated mineral technologies for more sustainable raw material supply" (ITERAMS) includes an effort to produce eco-friendly backfill materials to enhance operation and mine safety and covers for surface deposits of tailings based on geopolymerization technology. This paper investigates the effects of activator concentration, curing temperature and time on alkali-activated materials based on low-alumina MTs from the Cu/Ni mine in Northern Finland. Alkaline activators containing sodium silicate solution (Na 2 SiO 3) at different concentrations were used and two different curing temperatures, 40 °C and 60 °C, for periods of 7, 14, and 28 days were considered. Scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS) and X-ray diffraction (XRD) were performed to investigate the structure, morphology and phase compositions of the alkali-activated products. The effect of curing temperature and alkaline solutions on mechanical strength and water absorption were investigated. The results indicate that the alkalinity and curing temperature affect the mechanical and microstructural properties of the compositions of alkali-activated MTs. The 30 wt% Na 2 SiO 3 addition enables the alkali activated MT to improve the compressive strength with a highest value of 6.44 and 15.70 MPa after 28 days of curing at 40 °C and 60 °C, respectively. The results of this study deliver useful information for recycling and utilization of MTs as sustainable material through the alkali activation.

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“…In addition to the positive mechanical characteristics of using slag in the alkali-activation process, there are some unfavorable aspects associated with using slag, such as volumetric instability and high shrinkage compared to OPC, and these drawbacks limit its utility in the construction industry [21]. Various studies have demonstrated that the combination of slag as a high-calcium-level precursor with another low-calcium-level precursor reduces shrinkage compared to alkali-activated binders solely containing slag [22][23][24][25][26][27][28][29][30][31][32][33].…”

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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Mechanical and acoustic properties of fiber-reinforced alkali-activated slag foam concretes containing lightweight structural aggregates

Cited by 112 publications

References 22 publications

Fibre-Reinforced Foamed Concretes: A Review

Fibre-Reinforced Foamed Concretes: A Review

Effects of Activator Properties and Curing Conditions on Alkali-Activation of Low-Alumina Mine Tailings

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

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