An approach for predicting the compressive strength of cement-based materials exposed to sulfate attack

Chen, Huaicheng; Qian, Chunxiang; Liang, Chengyao; Kang, Wen

doi:10.1371/journal.pone.0191370

Cited by 36 publications

(21 citation statements)

References 27 publications

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“…Studies revile that under compressive loading [13], resistance of the specimen increases as load increases [6,7,14]. Similarly in case of flexural loading, the resistivity at compression surface decreases because of movement of fibers towards each other and decreases at tension surface due to opposite movement of fibers because of pull in concrete [2,8,15,16].…”

Section: Strain Sensing Principalmentioning

confidence: 99%

“…In recent studies, many researchers noticed that unlike other fibers, carbon fibers have very active selfsensing ability/property [2]. When these fibers are randomly distributed in concrete body, they induce resistibility and self sensing property in concrete [3] with improved mechanical properties of concrete/cement composites [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Strain and Damage Sensing Property of Self-compacting Concrete Reinforced with Carbon Fibers

Cholker

Tantray

2019

IJE

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A B S T R A C TPresent paper investigated the strain and damage sensing property on concrete cubes embedded with carbon fibers. Concrete cubes of dimension 150 mm have been casted with different concentration of carbon fibers to study the strain and damage sensing property under cyclic loading that can be further used for health monitoring as non-destructive testing (NDT) approach. All the specimens were tested under cyclic loading within elastic region of the sample for three cycles of loading with a maximum load of 195kN for strain sensing test. During cyclic loading, fractional change in resistance (FCR) is calculated and co-relation with the stress is plotted. During strain sensing test, gauge factors (GF) were also calculated during loading and unloading on the samples. From obtained results, it is found that the concrete sample containing 1.5% of carbon fibers by weight of cement gives best co-relation between stress and FCR that can be further used for health monitoring purpose. Along with strain sensing property, damage sensing property and ultimate load carrying capacities of all the specimens are also reported in present paper with detailed explanation.

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Section: Strain Sensing Principalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strain and Damage Sensing Property of Self-compacting Concrete Reinforced with Carbon Fibers

Cholker

Tantray

2019

IJE

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“…It was noted that, electrical resistance changes when a longitudinal compressive load is applied to the cement composite specimen, for example when a cube/prismatic specimen is under compressive loading, the electrical conductivity increases (resistance decreases) of the sample due to movement of fibers towards each other and vice versa under tensile loading [5,6]. Similarly during flexural loading on cement composites, the electrical resistance of compression surface upon loading decreases due to fiber movement towards each other as surface is under compression and the same resistance increases at tension surface during unloading as there is pull in fibers as they move away from each other [5,7].…”

Section: Introductionmentioning

confidence: 99%

Influence of Carbon Fibers on Strain and Damage Sensing of Self Compacting Concrete under External Applied Forces

Cholker¹,

Kavyateja²,

Reddy³

2019

I2M

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In the present study, concrete cubes of 150mm embedded with carbon fibres in different dosages (from 0% to 2% by cement mass) were cast using self-compacting concrete. Two tests were conducted, namely strain sensing and damage sensing on all the samples and co-relation between a fractional change in electrical resistance (FCR) and properties of concrete under compressive load are reported. Strain sensing test was carried out within the elastic region and the co-relationship was achieved in between the strength and change in electrical resistance over time in order to obtain the strain sensing properties of the sample. The findings acquired show that concrete specimens with fiber dosage of 1.5 percent by cement mass produce a stronger correlation between a fractional change in resistance (FCR) and concrete compressive strength which can be used as a stress detecting property. Gage factors of all the specimens were also measured throughout strain sensing tests. Following strain sensing testing, all the samples were tested for the damage sensing test by gradually applying load until failure. The relationship between stress, electrical resistances and strain is established from obtained test results. Results obtained show that the same sample comprising 1.5% fiber by cement mass is able to sense damage and can be linked to the stress-strain curve of concrete that can further be used as NDT approach to obtain stress-strain in concrete if FCR is recognized.

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“…Crystallization pressure theory has often been referred to as the most likely mechanism. Chen et al [16] concluded that the main factors influencing concrete compressive strength are exposure time, water-cement ratio, and sulfate ions. Among these, sulfate attack had the greatest effect.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical Properties of Cemented Paste Backfill under Temperature-Chemical Coupling Conditions

Liu

2019

Advances in Materials Science and Engineering

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To investigate the effect of temperature-chemical coupling on the mechanical properties of cemented paste backfill, three temperatures (20°C, 35°C, and 50°C) and sodium sulfate solution mass concentrations (3%, 5%, and 7%) are applied to simulate the complex environment in a mine. Uniaxial compressive strength and the CPB stress-strain relationship are investigated by applying stress, and the deterioration mechanism was analyzed theoretically according to physical and chemical reactions. At the same time, a structural model of the CPB deterioration mechanism under TC coupling is constructed. Combined with analysis through X-ray diffraction and scanning electron microscopy, it is shown that ettringite and gypsum are the main erosive substances that destroy the structure of CPB and that increased temperatures accelerate the chemical reaction. The concentration change consumes calcium hydroxide, changing the relationship between ettringite and gypsum. Sodium sulphate crystallization is the main form of physical deterioration. The continuous load accelerates the inelastic deformation time of CPB, resulting in a large yield deformation process.

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An approach for predicting the compressive strength of cement-based materials exposed to sulfate attack

Cited by 36 publications

References 27 publications

Strain and Damage Sensing Property of Self-compacting Concrete Reinforced with Carbon Fibers

Strain and Damage Sensing Property of Self-compacting Concrete Reinforced with Carbon Fibers

Influence of Carbon Fibers on Strain and Damage Sensing of Self Compacting Concrete under External Applied Forces

Experimental Study on Mechanical Properties of Cemented Paste Backfill under Temperature-Chemical Coupling Conditions

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