Assessment of Degradation Index in Freeze-Thaw Damaged Concrete Using Multi-Channel Contactless Ultrasound

Kim, Ryulri; Min, Jiyoung; Eunjong, Ahn; Choi, Hajin

doi:10.2139/ssrn.4024044

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…And summarized a series of a large number of empirical equations between different specific types of velocity and concrete strength, as shown in Table 1. Ryulri et al [26] studied and established a 64-channel non-contact ultrasonic freezethaw damage evaluation system, and proposed a concrete damage evaluation algorithm based on leakage ultrasonic velocity. The effectiveness of the proposed system and algorithm was verified by numerical analysis and experiments for different freeze-thaw damage levels.…”

Section: Currennt Status Of Foreign Researchmentioning

confidence: 99%

Concrete Structure Ultrasonic Testing Technology Research Latest Progress and Development Trend

Yu¹,

Wen²,

Zhao³

et al. 2023

E3S Web Conf.

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Many concrete structures in use have safety problems due to material deterioration, actual construction defects, structural damage, etc. Therefore, nondestructive testing is required to determine the presence of defects. Ultrasonic technology is an important tool in nondestructive testing, which can detect defects in concrete and be combined with other methods or models to make it more accurate. At present, ultrasonic inspection technology has been more research at home and abroad, both in theory and in engineering, and there has been great progress. This paper summarizes the latest progress of ultrasonic inspection technology for concrete structures at home and abroad respectively, and points out the future development trend.

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Section: Currennt Status Of Foreign Researchmentioning

confidence: 99%

Concrete Structure Ultrasonic Testing Technology Research Latest Progress and Development Trend

Yu¹,

Wen²,

Zhao³

et al. 2023

E3S Web Conf.

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“…A fitting model corresponding to the fiber lifting rate and contribution rate [ 46 ] was established to quantitatively characterize the influence of PPF. At the same time, based on learning from the classical combination model of damage [ 47 , 48 , 49 , 50 , 51 ], the damage theory under freeze–thaw cycles was used [ 52 , 53 ]. A freeze–thaw damage model and a response surface model were established to analyze the frost resistance of PFNSC and PFMSC, and the effects of fiber content, fiber length, and freeze–thaw times on the frost resistances of PFNSC and PFMSC were studied.…”

Section: Introductionmentioning

confidence: 99%

Effects of Polypropylene Fibers on the Frost Resistance of Natural Sand Concrete and Machine-Made Sand Concrete

et al. 2022

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In order to study the effect of polypropylene fibers on the frost resistance of natural sand and machine-made sand concrete, polypropylene fibers (PPF) of different volumes and lengths were mixed into natural sand and machine-made sand concrete, respectively. The freeze–thaw cycle test was carried out on polypropylene-fiber-impregnated natural sand concrete (PFNSC) and polypropylene-fiber-impregnated manufactured sand concrete (PFMSC), respectively, and the apparent structural changes before and after freezing and thawing were observed. Its strength damage was analyzed. A freeze–thaw damage model and a response surface model (RSM) were established used to analyze the antifreeze performance of PFMSC, and the effects of the fiber content, fiber length, and freeze–thaw times on the antifreeze performance of PFMSC were studied. The results show that with the increase in the number of freeze–thaw cycles, the apparent structures of the PFMSC gradually deteriorated, the strength decreased, and the degree of freeze–thaw damage increased. According to the strength damage model, the optimum volume of PPF for the PFNSC specimens is 1.2%, and the optimum volume of PPF for the PFMSC specimens is 1.0%. According to the prediction of RSM, PFNSC can maintain good antifreeze performance within 105 freeze–thaw cycles, and when the PPF length is 11.8 mm, the antifreeze performance of PFNSC reaches the maximum, its maximum compressive strength value is 33.8 MPa, and the split tensile strength value is 3.1 MPa; PFMSC can maintain a good antifreeze performance within 96 freeze–thaw cycles. When the length of PPF is 9.1 mm, the antifreeze performance of PFMSC reaches the maximum, its maximum compressive strength value is 45.8 MPa, and its split tensile strength value is 3.2 MPa. The predicted values are in good agreement with the measured values, and the model has high reliability.

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Assessment of Degradation Index in Freeze-Thaw Damaged Concrete Using Multi-Channel Contactless Ultrasound

Cited by 2 publications

References 16 publications

Concrete Structure Ultrasonic Testing Technology Research Latest Progress and Development Trend

Concrete Structure Ultrasonic Testing Technology Research Latest Progress and Development Trend

Effects of Polypropylene Fibers on the Frost Resistance of Natural Sand Concrete and Machine-Made Sand Concrete

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