Durability studies on recycled fine aggregate concrete

Kirthika, S. K.; Singh, Siddharth

doi:10.1016/j.conbuildmat.2020.118850

Cited by 109 publications

(57 citation statements)

References 35 publications

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“…From Fig. 7, it is observed as the FRA increases, the slump of the concrete decreases (Kirthika and Singh 2020;Fan et al 2016;Berredjem et al 2020). The decrease in the slump of the concrete can be attributed to the rough texture and higher angularity of FRA particles as observed in Fig.…”

Section: Workabilitymentioning

confidence: 74%

“…The decrease in the strength of FRAC is due to the higher porosity of FRA The strength of R-50 is 5.23% less compared to R-0, and the strength of R-100 is 19.53% less compared to R-0 at 90 days. It is observed that increased curing reduces the percentage decrease in the strength of the concrete (Berredjem et al 2020;Kirthika and Singh 2020). As the curing period increases, better interconnectivity of pores results in the strength improvement of the concrete.…”

Section: Compressive Strengthmentioning

confidence: 95%

“…The study reported that weakness of ITZ due to the higher porosity of FRA decreases the strength of FRAC. Kirthika and Singh (2020) observed that the increase in the replacement of the FRA decreased the strength and durability of the FRAC, but densification of micro-structure in the FRAC mixes upon increased curing improved the properties of the FRAC. Leite and Leite (2019) observed that the water absorption of FRA was 90.6% more compared to NFA and also infer that the mix with 60% of NFA and 40% of FRA shows better particle packing with less voids.…”

Section: Introductionmentioning

confidence: 93%

“…After curing at suitable ages, the specimens were removed; the surface was wiped out and was mounted on the length comparator to determine the relative difference in the length of the specimen (Kirthika and Singh 2020). The carbonation resistance of the concrete mixtures was performed at 30, 60, and 90 days (Geng and Sun 2013).…”

Section: Testing Of Specimensmentioning

confidence: 99%

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Effect of fine recycled aggregate on the strength and durability properties of concrete modified through two-stage mixing approach

Sivamani

Renganathan

2021

Environ Sci Pollut Res

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To overcome the scarcity of river sand and dumping of construction and demolition wastes, the fine recycled aggregate (FRA) collected from C&D wastes is being utilized as a replacement to river sand. Many earlier studies reported that the higher water absorption of fine recycled aggregate and weak interfacial transition zone (ITZ) resulted in the development of the concrete with less strength and durability requirements. This study surmounts the above two factors through pre-saturation and a two-stage mixing approach (TSMA) technique. The concrete mixes prepared at 0.45 w/c ratios with 0%, 25%, 50%, and 100% of FRA were evaluated through hardened properties such as compressive strength, split tensile strength, flexural strength, and durability properties such as water absorption, sorptivity, shrinkage, rapid chloride penetration, and carbonation tests. The results indicate that the optimum level of replacement of fine recycled aggregate was 25% and the increase of fine recycled aggregate decreases the strength and durability properties. However, increased curing of concrete resulted in better strength and durability properties. The strength of the concrete was increased by 12% at 28 days and 17.46% at 90 days by two-stage mixing approach. The water absorption, porosity, shrinkage, chloride penetration, and carbonation of two-stage mixing approach was decreased by 7.45%, 15.38%, 16.57%, 18.18%, and 13.51% compared to normal mixing approach. Microstructural investigations show improvement in the interfacial transition zone with two-stage mixing approach compared to normal mixing approach.

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Section: Workabilitymentioning

confidence: 74%

Section: Compressive Strengthmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 93%

Section: Testing Of Specimensmentioning

confidence: 99%

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Effect of fine recycled aggregate on the strength and durability properties of concrete modified through two-stage mixing approach

Sivamani

Renganathan

2021

Environ Sci Pollut Res

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“…Ряд опубликованных к настоящему времени работ по результатам исследований прочности железобетонных элементов в рассматриваемых условиях свидетельствует об отсутствии у исследователей единодушного мнения о степени влияния тех или иных вызывающих разрушение факторов, а предложенные мероприятия по повышению долговечности не имеют достаточной экспериментальной проверки сравнительной их эффективности [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”

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Features of Calculation of Centrifuged and Vibro-Centrifuged Reinforced Concrete Structures by Differential Construction Characteristics of Concrete

Mailyan

Стельмах

Shcherban’

et al. 2021

Bulletin of Belgorod State Technological University Named After. V. G. Shukhov

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This article raises one of the most popular questions: evaluation of calculations of differential design parameters of centrifuged and vibro-centrifuged concrete. It is established that various layers of concrete of annular cross-section in the process of centrifugation and vibro-centrifugation are influenced by forces that differ from each other in the magnitude of the impact. This leads to completely different indicators of concrete layers in density, strength, deformability and modulus of elasticity. Centrifugal and centripetal forces are the main factors that are worth to pay attention to and to use in the calculated dependencies as arguments. Therefore, in general calculations, which take into account the change in the structural parameters of concrete, it is advisable to use the structural indicators or their increase as functions, and as independent variables – the forces of inertia of rotation, which, in turn, are the dependence of the distance from the center of rotation and the angular velocity of rotation. As a result, the calculated dependencies are derived for the differentiated accounting of changes in all the characteristics of concrete necessary for calculating, which gives grounds to enter into the calculation of structures the strength and deformation indicators of concrete that differ in cross section, and to use the existing reserves of the bearing capacity of elements.

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