Experimental determination of freeze-thaw resistance in self-compacting concretes

Kocáb, Dalibor; Lišovský, Martin; Žítt, Petr

doi:10.1088/1757-899x/549/1/012019

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…The final decrease was about 15% and 4% for E rL and compressive strength, respectively. The long-term experience of the authors with the utilization of the resonance method as a nondestructive technique for monitoring of the F–T damage in concrete suggests that a decrease in E rL of about 15% indicates a decrease in the flexural or splitting tensile strength of at least about 25% [ 32 , 33 ]. This presumption is confirmed by the results presented in Figure 10 a; the decrease in splitting tensile strength was about 40% for C2.…”

Section: Resultsmentioning

confidence: 99%

Advanced Evaluation of the Freeze–Thaw Damage of Concrete Based on the Fracture Tests

et al. 2021

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This paper presents the results of an experimental program aimed at the assessment of the freeze–thaw (F–T) resistance of concrete based on the evaluation of fracture tests accompanied by acoustic emission measurements. Two concretes of similar mechanical characteristics were manufactured for the experiment. The main difference between the C1 and C2 concrete was in the total number of air voids and in the A300 parameter, where both parameters were higher for C1 by about 35% and 52%, respectively. The evaluation of the fracture characteristics was performed on the basis of experimentally recorded load–deflection and load–crack mouth opening displacement diagrams using two different approaches: linear fracture mechanics completed with the effective crack model and the double-K model. The results show that both approaches gave similar results, especially if the nonlinear behavior before the peak load was considered. According to the results, it can be stated that continuous AE measurement is beneficial for the assessment of the extent of concrete deterioration, and it suitably supplements the fracture test evaluation. A comparison of the results of fracture tests with the resonance method and splitting tensile strength test shows that all testing methods led to the same conclusion, i.e., the C1 concrete was more F–T-resistant than C2. However, the fracture test evaluation provided more detailed information about the internal structure deterioration due to the F–T exposure.

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Section: Resultsmentioning

confidence: 99%

Advanced Evaluation of the Freeze–Thaw Damage of Concrete Based on the Fracture Tests

et al. 2021

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“…Gray brick is an ancient building material made of clay fired at high temperature [ 1 ], which has the characteristics of high porosity, loose texture, low strength, strong water absorption and poor frost resistance [ 2 , 3 ] As the gray bricks are exposed to the open environment for a long time, they are vulnerable to the effects of rain, snow, temperature, seasonal freeze–thaw cycles and other climatic conditions, resulting in different degrees of weathering damage on their surfaces, such as pulverization, desquamation and cracks. Among them, the effect of freeze–thaw cycles in reducing the stability of these materials and causing their premature failure cannot be ignored [ 4 , 5 , 6 , 7 ]. In addition, the influences of groundwater, seepage and environmental humidity give rise to fluctuations in the moisture content within the bricks, resulting in variations in water content [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Study on Deterioration of Gray Brick with Different Moisture Contents under Freeze–Thaw Environment

Yue

Zhao

et al. 2022

Materials

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Generally, brick buildings are in the open-air environment year round, and damage to them is aggravated by the effect of repeated freezing and thawing cycles. In order to determine freeze–thaw damage and deterioration mechanism, the initial moisture content of gray brick specimens was set as 20%, 40%, 60%, 80%, 100%. The effects of moisture content and the number of freeze–thaw cycles on the quality, mechanical properties and microstructure of gray brick were investigated by uniaxial compression tests and scanning electron microscopy (SEM) tests. Numerical simulations were applied to model the freezing and thawing process. The results showed that: as the number of freeze–thaw cycles increased, the mass loss rate and peak strength reduction rate of gray brick both increased. The initial moisture content had a greater impact on damage to gray brick due to freeze–thaw; ω = 80% was defined as the limit moisture content of gray brick. Under the repeated action of freeze–thaw cycles, the areas affected by thermal stress were mainly concentrated in the center of the outer surface and the center of the side of gray bricks. The maximum thermal stress after 55 freeze–thaw cycles was 1.522 × 10−2 MPa. This research results provide a theoretical basis for the prevention and protection of frost damage of brick buildings in a freeze–thaw environment.

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Determination of frost resistance of concrete on specimens acquired from a structure vs. produced in a laboratory

Alexa,

Kocáb,

Vymazal

et al. 2023

24th Topical Conference on Radio-Frequency Power in Plasmas

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Experimental determination of freeze-thaw resistance in self-compacting concretes

Cited by 3 publications

References 6 publications

Advanced Evaluation of the Freeze–Thaw Damage of Concrete Based on the Fracture Tests

Advanced Evaluation of the Freeze–Thaw Damage of Concrete Based on the Fracture Tests

Study on Deterioration of Gray Brick with Different Moisture Contents under Freeze–Thaw Environment

Determination of frost resistance of concrete on specimens acquired from a structure vs. produced in a laboratory

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