Investigation on engineering properties and micro-structure characteristics of low strength and high strength geopolymer composites subjected to standard temperature exposure

Kanagaraj, Balamurali; Anand, N.; Andrushia, A. Diana; Lublóy, Éva

doi:10.1016/j.cscm.2022.e01608

Cited by 11 publications

(12 citation statements)

References 43 publications

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“…The hydrated water may not be able to come out from the concrete matrix during the heating process, resulting in more pore pressure inside the concrete. The release of pore pressure in concrete results in spalling and strength loss (Kanagaraj et al, 2022). At temperatures between (200-600 8C), all types of fibres exhibit crack and spalling resistance.…”

Section: Jsfe 151mentioning

confidence: 99%

“…Over the past few years, many investigations have shown that GC can be used in construction practices due to its sustainability, its eco-friendly environment, and higher strength properties and durability (Kanagaraj et al, 2022;Li et al, 2010). Although GC has a higher CS than CC, it has a lower TS and FS performance (Ranjbar and Zhang, 2020).…”

Section: Jsfe 151mentioning

confidence: 99%

“…4.6.3 Spalling of concrete. When a concrete specimen is exposed to elevated temperatures, a small amount of the concrete component that is separated from the main concrete surface is known as spalling (Kanagaraj et al, 2022). During the heating of the specimen, the moisture in the concrete develops pore water pressure.…”

Section: Development Of Empirical Relationshipmentioning

confidence: 99%

“…There is no spalling; if the moisture content in the concrete structure is lower due to a lower density of concrete, the moisture will escape through the pore water channels (Bangi and Horiguchi, 2011). An explosive spalling is noted if the pore water pressure in the concrete is higher due to the high density of the concrete (Kanagaraj et al, 2022). Fibre-reinforced concrete can help minimize the explosive spalling behaviour at high temperatures by creating pore water pressure channels within the concrete (Kalifa et al, 2001).…”

Section: Development Of Empirical Relationshipmentioning

confidence: 99%

“…GC showed higher residual strength than CC in the case of fire and impact resistance. It is due to the excellent binding property between alkaline binders and alkaline solutions with strong geo-polymerisation gels in the pore-density concrete (Kanagaraj et al. , 2022).…”

Section: Introductionmentioning

confidence: 99%

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Post-fire investigation on the mechanical properties and physical characteristics of fibre-reinforced geopolymer concrete

Prasad Burle,

Kiran,

Anand

et al. 2023

JSFE

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PurposeThe construction industries at present are focusing on designing sustainable concrete with less carbon footprint. Considering this aspect, a Fibre-Reinforced Geopolymer Concrete (FGC) was developed with 8 and 10 molarities (M). At elevated temperatures, concrete experiences deterioration of its mechanical properties which is in some cases associated with spalling, leading to the building collapse.Design/methodology/approachIn this study, six geopolymer-based mix proportions are prepared with crimped steel fibre (SF), polypropylene fibre (PF), basalt fibre (BF), a hybrid mixture consisting of (SF + PF), a hybrid mixture with (SF + BF), and a reference specimen (without fibres). After temperature exposure, ultrasonic pulse velocity, physical characteristics of damaged concrete, loss of compressive strength (CS), split tensile strength (TS), and flexural strength (FS) of concrete are assessed. A polynomial relationship is developed between residual strength properties of concrete, and it showed a good agreement.FindingsThe test results concluded that concrete with BF showed a lower loss in CS after 925 °C (i.e. 60 min of heating) temperature exposure. In the case of TS, and FS, the concrete with SF had lesser loss in strength. After 986 °C and 1029 °C exposure, concrete with the hybrid combination (SF + BF) showed lower strength deterioration in CS, TS, and FS as compared to concrete with PF and SF + PF. The rate of reduction in strength is similar to that of GC-BF in CS, GC-SF in TS and FS.Originality/valuePerformance evaluation under fire exposure is necessary for FGC. In this study, we provided the mechanical behaviour and physical properties of SF, PF, and BF-based geopolymer concrete exposed to high temperatures, which were evaluated according to ISO standards. In addition, micro-structural behaviour and linear polynomials are observed.

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Section: Jsfe 151mentioning

confidence: 99%