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.

New emerging surface treatment of GFRP Hybrid bar for stronger durability of concrete structures

2016 ◽  
Vol 17 (4) ◽  
pp. 593-610 ◽  
Author(s):  
Cheolwoo Park ◽  
Younghwan Park ◽  
Seungwon Kim ◽  
Minkwan Ju
Keyword(s):  
Surface Treatment ◽  
Concrete Structures ◽  
Durability Of Concrete

Kostenstufen der Betonsanierung, oder warum es nicht immer besser ist, sofort zu sanieren / Stages of expenses for restoration of concrete structures, or why it is not always the best solution to restore immediately

1999 ◽  
Vol 5 (4) ◽  
pp. 359-386
Author(s):  
R. Wolfseher
Keyword(s):  
Surface Treatment ◽  
Concrete Structures ◽  
The Other ◽  
Optimal Time ◽  
Actual State ◽  
Construction Process ◽  
Different Types ◽  
The One ◽  
The Right ◽  
Bearing Structure

Abstract Restoration of concrete structures implies repair of damage and a surface treatment which prevents future damage of the load bearing structure in case it is renewed in time. Depending on the performance of the protective surface treatment the substrate has to be prepared more or less carefully. On the one hand it is worth while to apply an inexpensive solution appropriate for a given situation and on the other hand to predict the optimal time for a necessary intervention. Different types of surface treatments can be attributed to discrete stages of expenses. In this contribution it is shown that based on a reliable analysis of the actual state, the cheapest type of restoration can be found in an unambiguous way and executed at the right moment. At the end examples are given. The necessary investment can be optimized. Finally, it will be underlined that money spent for quality control during the construction process can be considered to be an investment yielding 17% interest.

scholarly journals Durability Assessment of Concrete by using Electrical Resistivity & Rapid Chloride Permeability Technique

2019 ◽  
Vol 9 (1) ◽  
pp. 5175-5179
Keyword(s):  
Electrical Resistivity ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Experimental Studies ◽  
Concrete Durability ◽  
Chloride Permeability ◽  
Distribution Shape ◽  
Porous Microstructure ◽  
Durability Of Concrete

The durability of concrete is generally evaluated by many NDT technique, among the different NDT technique RCPT is one of the popular NDT method used by many researchers & practicing Engineers for evaluation of concrete durability. However the RCPT technique has some limitation on field test of concrete, considering the limitation of the RCPT technique a new technique has been intr oduced called Electrical resistivity technique is used for evaluation of concrete durability in both field & lab test. Durability of concrete is mainly depends on the properties of concrete microstructure i.e. pore size distribution, shape & connectivity of the microstructural pores in concrete. In general smaller pore size, with lesser connectivity results lower permeability & shows more durability, while concrete with porous microstructure having larger pore size distribution along with larger degree of interconnections results in higher permeability and shows poor durability. In this paper an experimental studies were conducted for evaluation of concrete durability on different types of concrete samples by using electrical resistivity & RCPT technique. From the experimental results it has been observed that concrete with lower level of Chloride permeability shows higher Electrical resistivity. Thus Electrical resistivity of concrete is directly influencing the durability of concrete.

scholarly journals Durabilidad del concreto con agregados de alta absorción

2019 ◽  
Vol 20 (4) ◽  
pp. 1-13
Author(s):  
Rómel Gilberto Solís Carcaño ◽  
Miguel Ángel Alcocer Fraga
Keyword(s):  
Electrical Resistivity ◽  
Environmental Conditions ◽  
Mechanical Resistance ◽  
Concrete Durability ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Porosity And Permeability ◽  
High Absorption ◽  
Durability Of Concrete

Durability of concrete constructions is equally important as mechanical resistance, since it determines the capacity to withstand the environmental conditions to which the construction will be subjected for several decades. Most of concrete durability problems are associated with its porosity and permeability, properties on which the ability to allow the flow of liquids and gases depends. The aim of the present work was to evaluate the durability of the concrete manufactured with limestone aggregates of high absorption and water/cement ratio in a range of 0.40 to 0.70, by means of the resistance to the compression, the porosity, the permeability to the air, the sorptivity and the electrical resistivity. Results showed that this type of concrete can have a good durability in aggressive environments with an A/C of 0.40, and in environments of moderate aggressiveness with an A/C of 0.50.

scholarly journals Application of Fuzzy and Rough Sets to Environmental Zonation for Concrete Durability: A Case Study of Shaanxi Province, China

2020 ◽  
Vol 12 (8) ◽  
pp. 3128 ◽  
Author(s):  
Daming Luo ◽  
Yan Wang ◽  
Shaohui Zhang ◽  
Ditao Niu
Keyword(s):  
Service Life ◽  
Rough Sets ◽  
Concrete Structures ◽  
Shaanxi Province ◽  
Maintenance Cost ◽  
Concrete Durability ◽  
Freeze Thaw ◽  
Thaw Cycle ◽  
The Impact ◽  
Durability Of Concrete

The durability of concrete structures is influenced by various factors, and the durability damage mechanism is different when the structure is in different environmental conditions. This will have implications for improving the durability of concrete structures and extending its service life if the special environmental condition is taken into account in the durability design. Aimed at the environmental zonation for concrete durability, this paper investigated the durability factors influencing concrete structures in Shaanxi Province, China, including atmospheric temperature, precipitation, corrosive gas, and acid rain. The variations of the above-mentioned factors were analyzed and the indexes of environmental zonation were proposed. According to the zoning principle, the weights of zoning indexes calculated using fuzzy rough sets were used to divide Shaanxi Province into three first-level zones, namely the Freeze-Thaw Cycle Zone, the Neutralization–Freeze-Thaw Interaction Zone, and the Neutralization Zone. These three zones were then subdivided into nine second-level zones. The main mechanism of concrete deterioration and the environmental characteristics of all zones were then analyzed. The method proposed in this paper puts forward clear zoning indexes and quantifies them, which can improve the quality and accuracy of the zoning results. Moreover, the research achievements are helpful for engineers to reduce the impact of the environment on structure and the maintenance cost during the structural service life to a certain extent.

scholarly journals Influence on Durability of Concrete with Different Types of Cement, Pozzolonic Materials & Epoxy Coating on Concrete Exposed to Different Types of Acid Exposure.

2019 ◽  
Vol 9 (1) ◽  
pp. 7173-7180
Keyword(s):  
Fly Ash ◽  
Protective Coating ◽  
Storage Tank ◽  
Research Work ◽  
Epoxy Coating ◽  
Concrete Durability ◽  
Acid Attack ◽  
Different Types ◽  
Epoxy Paint ◽  
Durability Of Concrete

The concrete is a highly alkaline material and it is highly susceptible to acid attack. The concrete is one of the most useful materials for storage tank of different types of acids in Industries. Thus the durability of concrete against acid attack is one of the great concern in industries. In this paper the research work was carried out on influence of different types of cement, pozzolonic materials and Epoxy coating on concrete durability against different types of acid attack like H2SO4, HNO3 & H3PO4 . From the research work it has been observed that concrete with normal Portland cement shows more deterioration than concrete with Portland composite cement and also concrete with Pozzolonic materials like Fly ash & GGBS shows extensive resistance against acid attack in concrete due to consumption of Ca(OH)2 in concrete through Pozzolonic reaction. The research work also shows that concrete with GGBS in concrete & also concrete with external protective coating of Epoxy paint has high potential resistance against acid attack in concrete.

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
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