Toughness, elasticity and physical properties for the evaluation of foamed concrete reinforced with hybrid fibers

Dawood, Eethar Thanon; Mohammad, Yahya Ziad; Abbas, Waleed A.; Mannan, M. A.

doi:10.1016/j.heliyon.2018.e01103

Cited by 25 publications

(15 citation statements)

References 12 publications

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“…The flow time should be within 20 s so that a sufficient amount of the mixture is placed in the mold and self-sealing without any external devices [ 8 , 55 ]. Reportedly, [ 159 , 160 ], various factors affect the mixture’s consistency and rheology; which are mainly associated with the components and technology of the mixture. For this, the mixture’s components must be precisely calculated to improve the rheology and consistency of FRFCC, attain self-sealing behaviors, and enhance the adhesion and cohesion between the foaming agent and the cementitious filler.…”

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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“…Adopted hybridization ensures multi-scale resistance to cracking (Cattaneo & Biolzi, 2010) carbon, polypropylene, steel Polypropylene fibers with other hybrid fibers create a negative effect on the performance of concrete under elevated temperature. (Dawood, Mohammad, Abbas, & Mannan, 2018)…”

Section: Author Refmentioning

confidence: 99%

Development of hybrid steel-basalt fiber reinforced concrete – in aspects of flexure, fracture and microstructure

Jenifer

Dharmar

2021

rdlc

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The conventional concrete is considered to be critical in various constructional applications due to its setbacks such as service load failures, brittle property, low ductility and low tensile capacity. Apart from the natural bridging mechanism (aggregate bridging), an additional bridging mechanism is necessary to overcome the existing setbacks in plain cement concrete. Thus concrete with one or more types of fibers in suitable combinations can augment the mechanical performance of concrete causing a positive synergy effect. Along with the two control mixes with and without copper slag as partial replacement of fine aggregate, two different groups of hybrid combination of fibers such as steel and basalt were cast with 3 different groups of coarse aggregate proportions of sizes 20 mm and 12.5 mm. The hybridization of fibers is assessed in this study under compression, tension, flexure and fracture. Stress-strain data were recorded under compression to validate the strain capacity of the mixtures. The mechanical properties were analyzed for the positive hybrid effect and the influencing factors were copper slag, hybrid fiber combination and coarse aggregate proportions. The optimum volume fraction of fibers and mix proportions were highlighted based on various behaviors of concrete. Steel as macro fibers and basalt as microfibers were examined under microstructural studies (SEM and EDX). The results from the flexural toughness showcased the potential of hybrid fibers with greater energy absorption capacity ensuring the ductile property of the proposed hybrid fiber reinforced concrete.

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“…The f' c(600d) reached 110.7 MPa for the 400C-180WP mixture, while this was only 79.5 MPa for the 400C-180LF mixture (Table 3), given the dilution effect that resulted from the presence of inert LF materials [12,13]. Regardless of testing age, it is important to note that the f' c values were always higher for mixtures containing combinations of WP together with MK and SF, as compared to SCC prepared with only WP (Table 3).…”

Section: Compressive Strength and Its Evolution Over Timementioning

confidence: 99%

“…Tested mixtures contained up to 120 kg/m 3 LF, 250-400 kg/m 3 CEM, and water-to-powder ratio (w/p) varying from 0.38 to 0.72. The LF is not reactive with calcium hydroxide; however, many studies proved its efficiency to promote nucleation and C-S-H precipitation during cement hydration [12,13,14]. Silva and Brito [6] reported that the substitution of CEM by large FA and/or LF volumes (i.e., up to 65%) can substantially alter the SCC pore structure and durability.…”

Section: Introductionmentioning

confidence: 99%

Durability of self-consolidating concrete containing natural waste perlite powders

Mir

Nehme

Assaad

2020

Heliyon

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Perlite is a natural glassy volcanic rock used in construction applications requiring improved lightweight, thermal, and acoustic properties. During processing of raw perlite (i.e., cutting and fractioning to different sizes), large amounts of powders are collected and stored as waste materials. This paper evaluates the effect of waste perlite (WP) powders on durability and long-term transport properties of self-consolidating concrete (SCC). Different mixtures prepared with 580 kg/m 3 powder using various combinations of WP, limestone filler (LF), metakaolin (MK), and silica fume (SF) are tested over 2-years period. Test results showed that WP confers particular benefits to the SCC compressive strength and its evolution over time, particularly when used in combination with MK and SF. Water permeability, carbonation, and chloride ion migration curtailed when WP concentration reached 220 and 260 kg/m 3 . In contrast, the resistance against freeze/thaw remarkably improved, given the pozzolanic reactions and porous nature of such powders that accommodated the disruptive expansive stresses resulting from frost attack.

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Toughness, elasticity and physical properties for the evaluation of foamed concrete reinforced with hybrid fibers

Cited by 25 publications

References 12 publications

Fibre-Reinforced Foamed Concretes: A Review

Fibre-Reinforced Foamed Concretes: A Review

Development of hybrid steel-basalt fiber reinforced concrete – in aspects of flexure, fracture and microstructure

Durability of self-consolidating concrete containing natural waste perlite powders

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