Mechanical behavior of fiber reinforced slag-based geopolymer mortars incorporating artificial lightweight aggregate exposed to elevated temperatures

Kadhim, Sarah; Çevik, Abdülkadir; Niş, Anıl; Bakbak, Derya; Aljanabi, Maysam

doi:10.1016/j.conbuildmat.2021.125766

Cited by 40 publications

(6 citation statements)

References 39 publications

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“…In general, the addition of polyester fibers tends to decrease the fresh density of the mix, as seen in mixes M2, M3, and M4 where the fresh density decreases with increasing fiber content. This outcome aligns with the findings reported in [ 44 , 45 ], which also concluded that the addition of fiber decreases the fresh density of mortar. This is because the fibers increase the volume of the mix without adding weight, also the fibers displace some of the geopolymer matrix, resulting in a less dense mix.…”

Section: Resultssupporting

confidence: 92%

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Synergic effect of polyester fiber and nano silica on chemical resistance of geopolymer mortar

Hussein,

Mosaberpanah,

Kurda

2023

PLoS ONE

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The aim of this study is to evaluate the synergistic effect of polyester fiber-reinforced and nanoslica on the technical performance and durability of geopolymer mortar in terms of the chemical resistance. The study examined how the addition of polyester fiber and nanosilica affects the short-term severe durability of geopolymer mortar specimens made with fly ash (type F). The specimens were cured under ambient conditions. Different percentages (0.6%, 1.2%, and 1.8%) of polyester fiber were used, both with and without nanosilica. Additionally, a reference mixture containing only nanosilica was prepared.All mixtures had a liquid to binder ratio of 0.50, and the ratio of NaOH to Na2SiO3 solution was kept at 2.5:1 by weight. The produced mixes, after 28 days of ambient curing, were immersed for another 28 days in solutions containing 3.5%, 5%, and 5% of sodium chloride, magnesium sulphate and sulfuric acid, respectively. For comparison, control specimens which were not exposed to chemical attacks were tested at the same age of 56 days. Moreover, water absorption and sorptivity tests were conducted to explain the durability performance in a more detailed way. The test results express that the combination of both materials showed a synergistic effect and resulted in greater improvements in compressive and flexural strengths. Both materials can reduce the reduction in compressive strength caused by sulfuric acid exposure, but polyester fiber can increase mass loss. The presence of magnesium sulfate and sodium chloride can lead to a reduction in strength, but the addition of both polyester fiber and nanosilica can mitigate these effects. The addition of fibers creates a network of pores that can limit water absorption, and nanosilica can further enhance the microstructure and reduce water absorption. However, using polyester fiber beyond 1.2 percent can adversely affect the rate of water absorption.

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Section: Resultssupporting

confidence: 92%

“…On the other hand, the addition of nano silica tends to increase the fresh density of the geopolymer mortar mix, as seen in M5, which has a higher density than the control mix (M1). This is because the small size of the nanoparticles allows them to fill in the gaps between the larger geopolymer particles, leading to a denser mix [ 45 ].…”

Section: Resultsmentioning

confidence: 99%

Synergic effect of polyester fiber and nano silica on chemical resistance of geopolymer mortar

Hussein,

Mosaberpanah,

Kurda

2023

PLoS ONE

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“…Moreover, the tensioning effect that could be provided under normal temperatures was lost after high-temperature treatment, resulting in an even greater decline in strength. Kadhim et al (2022) reported that melting fibers at high temperatures created microchannels in the matrix, increasing porosity and reducing residual strength. Although the fibers did not melt, the weak bond between the fibers and matrix reduced the compressive strength (Abdollahnejad et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

Experimental study on high-temperature resistance of alkali-activated slag concrete block masonry

Huang,

Zheng,

Wang

2023

Advances in Structural Engineering

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The use of blast furnace slag improves resource utilization and supports the achievement of sustainable development goals. The use of alkali-activated slag cementitious material (AASCM) provides a new direction for improving the fire resistance of masonry structures. The masonry investigated in this study was alkali-activated slag crushed aggregate concrete masonry (ASCCM) in which aggregates of blocks and mortars were crushed and screened using AASCM paste specimens. The compression behavior of 12 specimens during and after exposure to high temperatures, specifically 300, 500, 600, 700, 800, and 900°C was investigated. The specimens were maintained under the target temperature for 2 h. The compressive strength and axial deformation of the specimen were recorded. The compressive strength losses during exposure to 300, 500, 600, 700, 800, and 900°C are 15.9, 20.3, 38.3, 43.9, 63.3 and 73.8%, respectively. The compressive strength losses after exposure to 300, 500, 600, 700, 800, and 900°C are 10.6, 15.8, 34.0, 37.2, 58.6 and 72.2%, respectively. The rate of loss in elastic modulus is greater than that in compressive strength. During exposure to 300, 500, 600, 700, 800, and 900°C, the loss rates of elastic modulus are 56.5, 74.4, 83.3, 86.3, 92.9 and 93.9%, respectively. After exposure to 300, 500, 600, 700, 800, and 900°C, the loss rates of elastic modulus are 49.6, 67.3, 77.5, 82.0, 90.7 and 94.5%, respectively. The peak compressive strain values are 9.9 and 11.1 times that at room temperature. Equations for calculating the compressive strength, elastic modulus, peak compressive strain, and ascending section curve of the stress–strain relationship with temperature were derived. The research results provide a new choice for high temperature resistant masonry materials, and provide theoretical basis and data support for the application of AASCM in masonry structures in high-temperature environments.

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“…In the manufacture of lightweight mortars, the use of different low-density aggregates, such as natural aggregates (pumice, perlite, or vermiculite) [ 29 , 30 , 31 ] and expanded clay [ 32 ], has been documented. Furthermore, within the framework of the circular economy, in recent years various research projects have been carried out to manufacture lightweight mortars with incorporations of different types of waste, such as fly ash aggregates [ 31 , 33 , 34 ], biochar [ 35 , 36 ], sludge from municipal sewage treatment plants [ 37 ], poly(terephtalate ethylene) (PET) flakes from recycled packages [ 38 ], and wood processing by-products [ 39 ].…”

Section: Introductionmentioning

confidence: 99%

Development of Lightweight Mortars Using Sustainable Low-Density Glass Aggregates from Secondary Raw Materials

Romero,

Padilla,

García Calvo

et al. 2023

Materials

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In this study, different lightweight expanded glass aggregates (LEGAs) were produced from glass cullet and various carbonated wastes, through a thermal impact process. The effects of LEGA microstructure and morphology on both the adherence to the cement paste and the mechanical properties of mortars after 28 days of curing were studied. The properties of lightweight mortars made of either LEGAs or expanded clay aggregates were compared. The results demonstrated the feasibility of using LEGAs to produce glass lightweight aggregate mortar, with flexural and compressive strength values ranging from 5.5 to 8.2 MPa and from 28.1 to 47.6 MPa, respectively. The differences in mechanical properties were explained according to the microstructures of the fracture surfaces. Thus, arlite-type ceramic aggregates presented surface porosities that allowed mortar intrusion and the formation of an interconnected interface; although the surfaces of the vitreous aggregates were free from porosity due to their vitreous nature, the mortars obtained from different wastes presented compressive and flexural strengths in the range of lightweight mortars.

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Mechanical behavior of fiber reinforced slag-based geopolymer mortars incorporating artificial lightweight aggregate exposed to elevated temperatures

Cited by 40 publications

References 39 publications

Synergic effect of polyester fiber and nano silica on chemical resistance of geopolymer mortar

Synergic effect of polyester fiber and nano silica on chemical resistance of geopolymer mortar

Experimental study on high-temperature resistance of alkali-activated slag concrete block masonry

Development of Lightweight Mortars Using Sustainable Low-Density Glass Aggregates from Secondary Raw Materials

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