Properties and Deterioration Prediction of Acid Attacked Concrete

Ueda, Hiroshi; Ushijima, Sakae; Shyuttoh, Keizou

doi:10.2208/jsceje.63.27

JSCE JOURNAL OF MATERIALS, CONCRETE STRUCTURES AND PAVEMENTS

2007

DOI: 10.2208/jsceje.63.27

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Properties and Deterioration Prediction of Acid Attacked Concrete

Hiroshi Ueda¹,

Sakae Ushijima²,

Keizou Shyuttoh³

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Cited by 2 publications

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Infrared–Resin Crack Measurement and Preventive Work Technology for Maintenance

Shimoi,

Yamauchi,

Nakasho

2024

AJRS

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The use of thermography as a nondestructive evaluation technique is increasingly popular for maintaining concrete structures. Most inspections merely evaluate the locations and shapes of defects on surfaces. To address this shortcoming, it proposes an inspection method and preventive work using a coating-type resin sensor combined with an infrared camera. No method has been developed to assess the depth of defects. In this approach, infrared-reactive resin is applied. Thermographic images of the target area are captured sequentially. Temperature curves obtained at each pixel during the cooling process are analyzed using Fourier transform to differentiate defect states in various parts of the temperature distribution. The temperature change is found to be correlated with the defect size. Approximately 5% aluminum powder is mixed into the applied gel resin. Because of its specific gravity, it tends to concentrate in areas damaged by compression failure or to float. This report discusses technologies related to identification of defects and measuring their size in infrared-reactive resin, with examination of the effectiveness of measures to prevent scattering and collapse of defects caused by structural degradation. A concentric loading test on reinforced concrete columns confined by gel resin ties is described herein. Test variables include concrete compressive strength of 232–244 N/mm<sup>2</sup>, both below and above the equipment hole that caused the defect, and to measure the relation, a comparison with test specimens that are free of defects.

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Infrared–Resin Crack Measurement and Preventive Work Technology for Maintenance

Shimoi,

Yamauchi,

Nakasho

2024

AJRS

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Chemical Transformation Behavior of Cement Hydrates Deteriorated by Low Concentration Acid

Miyamoto

Hosokawa²,

Minagawa

et al. 2013

J. Soc. Mat. Sci., Japan

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This study measured the amount of the solid phases in the hardened cement specimens immersed in pH2.0 sulfuric acid solution, hydrochloric acid and mixed acid (sulfuric acid : hydrochloric acid = 2 : 8 and 8 : 2 in molar ratio) in order to discuss the chemical transformation behavior of cement hydrate deteriorated by these acids. As a result, it is obvious that the cement hydrates deteriorate due to the dissolution of Portlandite by the action of proton as well as the chemical alteration of AFm phase by the action of anion. In case of the sulfuric acid acted, Monosulfate and Monocarbonate transformed into Ettringite by the action of SO4 2− which permeated from the outside solution. On the other hand, in case of the hydrochloric acid acted, Monosulfate transformed into Friedel's salt via Kuzel's salt by the action of Cl − which permeated from the outside solution. Furthermore, in case of the mixed acid, Monosulfate and Monocarbonate preferentially transformed into Ettringite instead of Kuzel's salt or Friedel's salt. As a result, in the case of mixed acid, it was shown that Cl − may permeate to the depths more compared with the case of HCl independently since the amount of fixation of Cl − near the exposed surface becomes small by generating of Ettringite.

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Properties and Deterioration Prediction of Acid Attacked Concrete

Cited by 2 publications

References 8 publications

Infrared–Resin Crack Measurement and Preventive Work Technology for Maintenance

Infrared–Resin Crack Measurement and Preventive Work Technology for Maintenance

Chemical Transformation Behavior of Cement Hydrates Deteriorated by Low Concentration Acid

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