scholarly journals Upgrading Technologies for Concrete Structures Focusing on Surface Protection and their Prospects

2012 ◽  
Vol 61 (2) ◽  
pp. 203-209
Author(s):  
Takuji YAMADA ◽  
Kazuo EGUCHI ◽  
Hidenori HAMADA ◽  
Toyoaki MIYAGAWA
Keyword(s):  
Concrete Structures ◽  
Surface Protection

scholarly journals Outline of Recommendation for Concrete Repair and Surface Protection of Concrete Structures by JSCE

2005 ◽  
Vol 43 (11) ◽  
pp. 3-11 ◽  
Author(s):  
I. Funakawa ◽  
S. Ushijima ◽  
T. Miyagawa ◽  
Y. Yamamoto
Keyword(s):  
Concrete Structures ◽  
Concrete Repair ◽  
Surface Protection

scholarly journals Influência de materiais de proteção na resistividade elétrica do concreto

2012 ◽  
Vol 2 (1) ◽  
pp. 46-56
Author(s):  
M. S. Santor ◽  
A. L. G. Gastaldini ◽  
C. Crauss ◽  
G. T. Dos Santos ◽  
F. C. Rossini
Keyword(s):  
Electrical Resistivity ◽  
Surface Treatment ◽  
Protective Action ◽  
Concrete Structures ◽  
Concrete Durability ◽  
Surface Protection ◽  
Different Types ◽  
Polymer Mortar ◽  
Durability Of Concrete

RESUMOA durabilidade das estruturas de concreto armado é resultado da ação protetora do concreto sobre a armadura. Quando a passivação do aço deixa de existir a estrutura torna-se vulnerável ao fenômeno da corrosão, cuja propagação, após iniciada é essencialmente controlada pela resistividade elétrica do concreto. O objetivo deste trabalho foi avaliar a alteração na resistividade elétrica de concretos produzidos com diferentes tipos de cimento, CP II F, CP IV e CP V, submetidos a tratamento superficial com produto obturador dos poros e argamassa polimérica. Para efeito de análise os resultados foram comparados com os mesmos concretos sem aplicação do produto. Esses tratamentos foram realizados em concretos confeccionados com resistências à compressão na idade de 28 dias de 21,6MPa, 26,6 MPa e 31,6 MPa. Para todos os tipos de cimento utilizados e níveis de resistência adotados o tratamento superficial com argamassa polimérica resultou em maiores valores de resistividade elétrica.Palavras chave: Concreto; durabilidade; material de proteção superficial; resistividade elétrica.ABSTRACTThe durability of concrete structures is a result of the protective action of concrete on the reinforcement. When there is no passivation of steel, the structure becomes vulnerable to corrosion, and once corrosion starts its propagation is essentially controlled by the electrical resistivity of concrete. The objective of this study was to evaluate the change in electrical resistivity of concretes produced with different types of cement: CP II F, CP IV and CP V that were surface-treated with pore filler and polymer mortar. For analysis purposes, the results were compared with those of the blanks that were not subjected to surface treatment. These treatments were performed in concretes with the following compressive strengths at the age of 28 days: 21.6 MPa, 26.6 MPa and 31.6 MPa. For all types of cement used and strengths adopted, surface treatment with polymer mortar led to higher electrical resistivity values.Key words: Concrete; durability; surface protection material; electrical resistivity.

scholarly journals Upgrading Technologies for Concrete Structures Focusing on Surface Protection and their Prospects

2011 ◽  
Vol 60 (12) ◽  
pp. 1149-1155
Author(s):  
Minoru KUNIEDA ◽  
Tsuneo SHIROTA ◽  
Hisakazu HORII ◽  
Takahiro YAMAMOTO ◽  
Toshimi TOKUNO
Keyword(s):  
Concrete Structures ◽  
Surface Protection

scholarly journals Upgrading Technologies for Concrete Structures Focusing on Surface Protection and their Prospects

2012 ◽  
Vol 61 (1) ◽  
pp. 89-95
Author(s):  
Hidenori HAMADA ◽  
Norikazu NOMURA ◽  
Tsutomu NIINA ◽  
Hiroshi WATANABE ◽  
Norio TERADA
Keyword(s):  
Concrete Structures ◽  
Surface Protection

scholarly journals Performance Evaluation of Concrete Structures Using Crack Repair Methods

2021 ◽  
Vol 13 (6) ◽  
pp. 3217
Author(s):  
Tae-Kyun Kim ◽  
Jong-Sup Park
Keyword(s):  
Environmental Factors ◽  
Flexural Strength ◽  
Concrete Structures ◽  
Freezing And Thawing ◽  
Concrete Core ◽  
Surface Protection ◽  
Repair Method ◽  
Physical Chemical ◽  
Strength Tests ◽  
Crack Repair

Concrete structures deteriorate over time due to cracks induced by various physical, chemical, and environmental factors. This performance degradation not only reduces their service life but may lead to human casualties and other property damage as well. While concrete crack repair can help address this problem, the implementation of the optimal repair method is important according to the environmental conditions. In this study, epoxy, impregnating, and epoxy/impregnating methods were used to repair concrete cracks. Epoxy was used for crack injection, and a supernatant was used for surface protection. The epoxy/impregnating method was used to protect both cracked areas and surfaces. Activated cracks were induced using flexural strength tests, and the stiffness of the specimens according to the repair method was compared to examine the structural performance. In addition, after the flexural strength tests, the strength, carbonation, chloride, and freeze–thaw durability were evaluated for the concrete core specimens. The impregnating method yielded the best repair performance for strength, epoxy/impregnating method for carbonation, epoxy and epoxy/impregnating methods for chloride, and epoxy/impregnating method for freezing and thawing. The results of our study enable selection of the optimal repair method to be used in practical applications based on physical, chemical, and environmental factors.

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