A New Promising Method for Detecting Carbonization of Reinforced Concrete Building Structures During Inspections

Goglev, I. N.

doi:10.52957/27821919_2021_4_35

Cited by 2 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hydrogen pH value influences on the passivation properties of the protective concrete layer significantly. According to various studies, the concrete potential of hydrogen at loss of passivation is 8˂rH˂9.5 [2][3][4][5]. Loss of passivation of steel reinforcement to concrete begins at pH˂11 [4].…”

Section: Introductionmentioning

confidence: 99%

“…By reaction (1), the resulting calcium carbonate is a low-soluble compound, as a result, it bleeds on the concrete surface and pores in the form of salt [3,5]. As a consequence, there is a neutralization of the alkaline environment of the concrete.…”

Section: Introductionmentioning

confidence: 99%

“…As a consequence, there is a neutralization of the alkaline environment of the concrete. The excessive carbon dioxide in a humid environment (2) provides the formation of calcium hydrogen carbonate, a soluble compound, is able to be washed away by ambient moisture and removed away by atmospheric water [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…The carbonation causes decreasing of the reinforced concrete structures durability, especially of supporting and bending elements, due to concrete pH decreasing. The carbonation also passivates steel reinforcement properties and reduces the cross-sectional area of the reinforcement, as a result of the formation of corrosion products [3,5]. It can be clearly seen on examining structures operated in a humid environment for a long time (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 clearly shows the concrete protective layer failing as a result of the concrete carbonation; the horizontal prestressed steel reinforcement is bared and covered with corrosion products. Nowadays, phenolphthalein test solution is the most widespread method for detecting carbonation and determining its depth in planta [3]. The single working pH-transition coloring interval of phenolphthalein solution, as well as the absence of consensus on concrete pH are their significant disadvantages.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Possibilities of using alizarin and neutral red indicators to determine the neutralized layer of concrete in the field

2023

View full text Add to dashboard Cite

The article concerns with the prospects of using the phenolphthalein test solution in the practice of surveying concrete and reinforced concrete building structures in planta. The problem of the study is the limits of application of the phenolphthalein test solution on the pH level of the determined concrete (the indicator works only at 8≤rn≤10). There is a need of expanding the phenolphthalein test solution application. In order to determine the different pH zones of concrete we have to modernize the method by adding other indicators to phenolphthalein. The standard phenolphthalein test solution does not allow a high degree of accuracy in determining the most sensitive to carbonation boundary zones of concrete. We proposed to modernize the phenolphthalein sample solution by using additional acid-base indicators alizarin and neutral red. We presented the results of experiments on measuring the surface neutralized layer of concrete by alcoholic solutions of acid-base indicators alizarin and neutral red on different age and size concrete samples. As a result, one of the proposed indicators (neutral red) allows to expand the phenolphthalein test solution application. We compared the results obtained by the traditional and modified methods. According to it, the proposed modified method is more accurate one.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Possibilities of using alizarin and neutral red indicators to determine the neutralized layer of concrete in the field

2023

View full text Add to dashboard Cite

show abstract

New Indicator Method for Determining Carbonization Zones in Concrete and Reinforced Concrete Structures

Goglev

Loginova

2022

Bulletin of Belgorod State Technological University Named After. V. G. Shukhov

View full text Add to dashboard Cite

The article considers a new indicator method for identifying zones of carbonization (neutralization) of concrete, which can be successfully applied in the practice of inspections of building structures made of concrete and reinforced concrete (at the field and laboratory stages of work). The aspects of the occurrence and course of the carbonization (neutralization) process are considered. The cases of its influence on the durability of concrete and reinforced concrete building structures of various objects (industrial, transport, civil, hydraulic, linear) are analyzed. Carbonization can lead to leaching of concrete under certain conditions. This is followed by damage of armature in reinforced concrete structures. The objects of the survey using the new method are considered. A comparison of the effectiveness of this method with the phenolphthalein test method is made. The disadvantage of the phenolphthalein test method (PPTM) is that it does not allow to understand the full picture of the pH distribution of concrete over layers, because the indicator has 1 working color transition interval. The difference of the new method consists in higher accuracy: the method allows to identify areas in which the corrosion process of concrete associated with the mass transfer of the target component during carbonization is just beginning or is fully proceeding. In addition, it helps to assess the condition of the protective layer of concrete at the current time. The new method is promising, because it allows assessing the condition of the examined reinforced concrete structures for their durability and degree of damage. The results of the study can be used in organizing the repair of concrete and reinforced concrete building structures.

show abstract

A New Promising Method for Detecting Carbonization of Reinforced Concrete Building Structures During Inspections

Cited by 2 publications

References 0 publications

Possibilities of using alizarin and neutral red indicators to determine the neutralized layer of concrete in the field

Possibilities of using alizarin and neutral red indicators to determine the neutralized layer of concrete in the field

New Indicator Method for Determining Carbonization Zones in Concrete and Reinforced Concrete Structures

Contact Info

Product

Resources

About