On Deterioration Mechanism of Concrete Exposed to Freeze-Thaw Cycles

Trofimov, B Ya; Kramar, L. Y.; Schuldyakov, K.V.

doi:10.1088/1757-899x/262/1/012019

Cited by 12 publications

(6 citation statements)

References 2 publications

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“…F-T can damage cementitious materials by creating internal cracking due to cold temperature cycling. When water freezes, it exhibits a 9% volume increase that may cause deterioration either to the hardened paste, the aggregates, or both [20]. Since water is contained within the pores of the cementitious matrix destructive tensile stresses varying between 1N/mm 2 and 4N/mm 2 may be generated, depending on the exposure temperature, the connectivity of the pores and the degree of saturation [21,22,23].…”

Section: Introductionmentioning

confidence: 99%

Structural Properties and Damage Detection Capability of Carbon Nanotube Modified Mortars after Freeze-Thaw

et al. 2019

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Here we explore the structural properties and damage sensing of cementitious mortars after a freeze-thaw process (F-T) as a function of nano-modification. For this purpose, carbon nanotubes were added at 0.2–0.8 wt.% cement using two different dispersive agents. F-T resulted in reduced fracture energy in nano-modified specimens prepared using superplasticizer as a dispersant while the opposite held true for the surfactant-containing ones. All nano-modified mortars possessed significantly higher fracture energy compared to the plain specimens after F-T (up to 73% improvement). The acoustic emission activity was lower after F-T, while acoustic emission indicators revealed a more tensile mode of fracture in both plain and nano-modified mortars.

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Section: Introductionmentioning

confidence: 99%

Structural Properties and Damage Detection Capability of Carbon Nanotube Modified Mortars after Freeze-Thaw

et al. 2019

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“…Frost resistance tests are accompanied by the accumulation of residual dilation deformations affected by temperature-humidity stresses, ice formation and other factors. It is affected directly by the porosity, which is an integral part of the concrete structure which is formed as a result of cement hydration [24]. If the porous material is so wet that the theory of hydraulic over-pressure governs the freezing phenomenon, pore water is squeezed into the larger air-filled pores and the external environment surrounding the sample and causes there an abrupt increase of relative humidity.…”

Section: Internal Frost Damage Mechanismsmentioning

confidence: 99%

Concrete Performance in Cold Regions: Understanding Concrete’s Resistance to Freezing/Thawing Cycles

Abed¹,

Balázs²

2022

Sustainability of Concrete With Synthetic and Recycled Aggregates

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This Chapter provides a detailed better understanding of the freeze/thaw effect on concrete, it is discussing the attack mechanism for both types of freeze/thaw deterioration: Internal frost damage and Surface scaling. Freeze/thaw attack is a serious problem for concrete but the most common physical deterioration type that shortening the life of concrete in cold environments. An Air-entraining agent is one of the solutions for reducing the effect of freeze/thaw cycles on concrete. Meanwhile Using supplementary cementitious materials in the production of concrete has different effects on the behavior of concrete exposed to freeze/thaw cycles. This chapter is discussing five of the common supplementary cementitious materials and their effect on concrete resistance to freeze/thaw cycles.

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Section: Compressive Strength Versus Total Air Poresmentioning

confidence: 99%

“…The standard deviation of compressive strength varies from 1.9 and 2.1 MPa. The obtained results allowed for the classification of concrete in a range from C20/25 to C35/45 class (EN 206-1) [1]. Figure 8 presents a comparison between the total porosity of the considered concrete samples for the two mentioned methods (X-ray and Rapid Air).…”

Section: Compressive Strength Versus Total Air Poresmentioning

confidence: 99%

“…A number of studies have proven that it is difficult to preserve appropriate frost resistance of concrete and reinforced concrete structures [1,2]. To ensure frost resistance of concrete in exposure classes XF2-XF4, the European standard EN 206-1 [3] requires an air content in fresh mixture of at least 4% without verification of the pore structure in the hardened concrete [4].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Fly Ash Microspheres on the Pore Structure of Concrete

Haustein

Kuryłowicz-Cudowska

2020

Minerals

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The fly ash microspheres (FAMs) formed during the mineral transformation stage in coal combustion are hollow spherical particles with a density less than water. This paper presents the results of X-ray micro-computed tomography and an automatic image analysis system of the porosity in the structure of hardened concrete with microspheres. Concrete mixtures with ordinary Portland cement and two substitution rates of cement by microspheres—5% and 10%—are investigated. For all considered mixes, a constant water/binder ratio (w/b) equal to 0.50 was used. The distribution of the air voids and the compressive strength of the concrete were tested after 28 days. With the increasing mass of cement replacement by FAMs, the compressive strength decreases after 28 days. The total volume of the air voids in hardened concrete with fly ash microspheres tested by X-ray varies from 5.1% to 7.4%. The closed pores constitute more than 80% of the total content of air pores. The study proves that the use of microspheres grains with specific dimensions has a significant impact on concrete porosity. Their application in concrete technology can be an alternative aeration solution for fresh concrete mixes and an effective method for utilization.

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On Deterioration Mechanism of Concrete Exposed to Freeze-Thaw Cycles

Cited by 12 publications

References 2 publications

Structural Properties and Damage Detection Capability of Carbon Nanotube Modified Mortars after Freeze-Thaw

Structural Properties and Damage Detection Capability of Carbon Nanotube Modified Mortars after Freeze-Thaw

Concrete Performance in Cold Regions: Understanding Concrete’s Resistance to Freezing/Thawing Cycles

The Effect of Fly Ash Microspheres on the Pore Structure of Concrete

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