Effect of Salt-Frost Cycles on Mechanical Properties and Uniaxial Compression Stress–Strain Curve of Recycled Coarse Aggregate Concrete

Hu, Jintao; Wu, Jin; Cao, Tianbao

doi:10.1061/(asce)mt.1943-5533.0003006

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…The figure also shows that the cubic specimens after 200 freeze–thaw cycles present more serious surface scaling and more damage characteristics than the prism specimens after 200 freeze–thaw cycles. This can be explained in two ways: (1) influence of size effect; (2) since the ratio of surface area to volume around the cubic specimen is 1.33 times that of the prismatic specimen [ 42 ]. This also leads to the degree of frost damage gradually deepening.…”

Section: Resultsmentioning

confidence: 99%

“…The change of RDME can reflect the change of internal microstructure and overall compactness of concrete after frost damage, therefore, it can be used to characterize the degree of damage deterioration of freeze–thaw concrete [ 28 , 42 ]. It is worth noting that the mass loss of all mixtures was not apparent at the beginning of the freeze–thaw test.…”

Section: Resultsmentioning

confidence: 99%

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Experimental Study on Mechanical Properties and Pore Structure Deterioration of Concrete under Freeze–Thaw Cycles

2021

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Understanding the evolution of mechanical properties and microscopic pore structure of concrete after freeze–thaw cycles is essential to assess the durability and safety of concrete structures. In this work, the degradation law of mechanical properties and damage characteristic of micro-structure of concrete with two water-cement ratios (w/c = 0.45 and 0.55) is investigated under the condition of freezing–thawing cycles. The influence of loading strain rate on dynamic compressive strength is studied. The microscopic pore structure after frost damage is measured by low-field nuclear magnetic resonance (LF-NMR) technique. Then, a damage model based on the porosity variation is established to quantitatively describe the degradation law of macroscopic mechanical properties. The test results show that the relative dynamic modulus of elasticity (RDME), dynamic compressive strength, flexural strength, and splitting tensile strength of concrete decrease with the increase of freeze–thaw cycles. Empirical relations of concrete dynamic increase factor (DIF) under the action of freeze–thaw cycles are proposed. Moreover, the experimental results of NMR indicate that the porosity as well as the proportion of meso-pores and macro-pores of concrete gradually increased with the increasing of freeze–thaw cycles. The research results can provide reference and experimental support for the anti-frost design theory and durability life prediction of hydraulic concrete structures in cold regions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Experimental Study on Mechanical Properties and Pore Structure Deterioration of Concrete under Freeze–Thaw Cycles

2021

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“…Mass loss, reduction on relative dynamic modulus of elasticity and strength loss of concrete initiated during initial period of ice nucleation formation. Afterwards, surface scaling and internal crack of concrete developed and exacerbated sharply during the rapid growth period of ice crystal body, led to serious salt frost deterioration on concrete (Tuyan et al 2014;Liu and Hansen 2016;Ma et al 2018;Hu et al 2020).…”

Section: Freezing Expansion Pressure Of Deicing Salt Solutionsmentioning

confidence: 99%

Freezing Characteristics of Deicing Salt Solution and Influence on Concrete Salt Frost Deterioration

Luan,

Wu,

Geng

et al. 2023

ACT

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Concrete structures would commonly suffer from salt frost deterioration in cold climate areas. The governing mechanism of concrete salt frost deterioration was comprehensively influenced by the freezing characteristics of deicing salt solutions. Characteristics of solution density, freezing point, freezing volume variation, and freezing expansion pressure of deicing salt solutions were experimentally investigated. A special device was designed and adopted to determine the freezing expansion pressure of deicing salt solutions. Investigation results indicated that all characteristics of deicing salt solutions were affected by solution concentration. As solution concentration increased, the freezing point and the maximum expansion ratio of solution volume decreased, and the maximum contraction ratio of solution volume increased. Freezing expansion pressure was determined by solution component, solution concentration, and volume saturation degree. As the critical saturation degree of solution volume was reached, freezing expansion pressure increased sharply. The freezing expansion pressure of deicing salt solutions was high enough to cause concrete salt frost deterioration.

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Meso-scale mechanical deterioration of mortar subjected to freeze thaw cycles and sodium chloride attack

Wang

Ueda

et al. 2021

Cement and Concrete Composites

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Effect of Salt-Frost Cycles on Mechanical Properties and Uniaxial Compression Stress–Strain Curve of Recycled Coarse Aggregate Concrete

Cited by 6 publications

References 29 publications

Experimental Study on Mechanical Properties and Pore Structure Deterioration of Concrete under Freeze–Thaw Cycles

Experimental Study on Mechanical Properties and Pore Structure Deterioration of Concrete under Freeze–Thaw Cycles

Freezing Characteristics of Deicing Salt Solution and Influence on Concrete Salt Frost Deterioration

Meso-scale mechanical deterioration of mortar subjected to freeze thaw cycles and sodium chloride attack

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