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Literatura académica sobre el tema "Concrete electrical resistivity"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 1 de febrero de 2022

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Artículos de revistas sobre el tema "Concrete electrical resistivity"

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Cleven, Simon, Michael Raupach y Thomas Matschei. "Electrical Resistivity of Steel Fibre-Reinforced Concrete—Influencing Parameters". Materials 14, n.º 12 (20 de junio de 2021): 3408. http://dx.doi.org/10.3390/ma14123408.

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This paper presents a systematic study of the electrical resistivity of different steel fibre-reinforced concretes with fibre contents from 0 kg/m3 to 80 kg/m3 in order to identify possible effects of interactions among concrete composition and fibre type and content regarding electrical resistivity. Based on a literature review, four parameters, w/c ratio, binder content, ground granulated blast-furnace slag (GGBS) and fineness of cement, which show a significant influence on the electrical resistivity of plain concrete, were identified, and their influence on the electrical resistivity as well as interaction effects were investigated. The results of the experiments highlight that the addition of fibres leads to a significant decrease in electrical resistivity, independent of all additional parameters of the concrete composition. Additionally, it was shown that a higher porosity of the concrete, e.g., due to a higher w/c ratio, also results in a lower electrical resistivity. These results are in agreement with the literature review on plain concrete, while the influence of the concrete composition on the electrical resistivity is weaker with the increase in fibre content. The influence of fibre reinforcement is thus not affected by changes in the concrete composition. In general, a higher fibre dosage leads to a decrease in electrical resistivity, but the impact on the electrical resistivity varies slightly with different types of steel fibres. Based on this study, the potential of determining the fibre content using electrical resistivity measurements could be clearly presented.
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Hnin, Su Wai, Pakawat Sancharoen y Somnuk Tangtermsirikul. "Effects of Concrete Mix Proportion on Electrical Resistivity of Concrete". Materials Science Forum 866 (agosto de 2016): 68–72. http://dx.doi.org/10.4028/www.scientific.net/msf.866.68.

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Electrical resistivity is one of the important parameters for modeling corrosion behavior of concrete. Few researchers have been carried out to investigate this problem. This paper presents an experimental study on effects of concrete mix proportion on electrical resistivity of concrete. The electrical resistivity of concrete is measured using the four Wenner probe, which is a fast and simple test that evaluates the resistance of concrete against the entrance of ionic species. The varied parameters in this study were water/binder ratio, fly ash content, cement paste content (Υ) and curing conditions. Based on experimental results, a good correlation is obtained between electrical resistivity and compressive strength of concrete.The results showed that the electrical resistivity of concrete mainly depend on compressive strength and fly ash content. The results of this study can be used further to model the behavior of electrical resistivity of concrete when the mix proportions are provided and that can be supported information to design sacrificial anode protection system.
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Tian, Ye, Xian Yu Jin, Yuan Zhan y Nan Guo Jin. "Mechanical and Microstructure Characterization of Fresh High- and Normal- Strength Concrete with Non-Contact Electrical Resistivity Measurement". Advanced Materials Research 250-253 (mayo de 2011): 122–30. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.122.

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This paper reports the investigation on both high and normal strength concrete using a non-contact electrical resistivity facility. The bulk resistivity development (ρ(t)-t curves) of the fresh concretes was evaluated from casting to 72h. The relationship between the electrical resistivity and the pore structure obtained from mercury intrusion porosimetry (MIP) method was analyzed. And the compressive strength evolution of fresh high- and normal- strength concrete was studied based on the bulk resistivity at early ages. The experiment results indicated a linear relationship between the fractional porosity and electrical resistivity. A further correlation between the compressive strength and electrical resistivity was analyzed with Archie’s law. Based on these studies, it appears that the electrical resistivity test could provide information for the design, quality control, quality assurance, and utilization of both high- and normal- strength concrete.
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Robles, Kevin Paolo V., Dong-Won Kim, Jurng-Jae Yee, Jin-Wook Lee y Seong-Hoon Kee. "Electrical Resistivity Measurements of Reinforced Concrete Slabs with Delamination Defects". Sensors 20, n.º 24 (11 de diciembre de 2020): 7113. http://dx.doi.org/10.3390/s20247113.

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The main objectives of this research are to evaluate the effects of delamination defects on the measurement of electrical resistivity of reinforced concrete slabs through analytical and experimental studies in the laboratory, and to propose a practical guide for electrical resistivity measurements on concrete with delamination defects. First, a 3D finite element model was developed to simulate the variation of electric potential field in concrete over delamination defects with various depths and lateral sizes. Second, for experimental studies, two reinforced concrete slab specimens (1500 mm (width) by 1500 mm (length) by 300 mm (thickness)) with artificial delamination defects of various dimensions and depths were fabricated. Third, the electrical resistivity of concrete over delamination defects in the numerical simulation models and the two concrete slab specimens were evaluated by using a 4-point Wenner probe in accordance with AASHTO (American Association of State Highway and Transportation Office) T-358. It was demonstrated from analytical and experimental studies in this study that shallow (50 mm depth) and deep (250 mm depth) delamination defects resulted in higher and lower electrical resistivity (ER) values, respectively, as compared to measurements performed on solid concrete locations. Furthermore, the increase in size of shallow defects resulted in an increase in concrete resistivity, whereas the increase in sizes of deep delamination defects yielded opposite results. In addition, measurements done directly above the steel reinforcements significantly lowered ER values. Lastly, it was observed from experimental studies that the effect of delamination defects on the values of electrical resistivity decreases as the saturation level of concrete increases.
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Hnin, Su Wai, Pakawat Sancharoen y Somnuk Tangtermsirikul. "EFFECTS OF MIX PROPORTION ON ELECTRICAL RESISTIVITY OF CONCRETE WITH FLY ASH". ASEAN Engineering Journal 7, n.º 2 (1 de diciembre de 2017): 53–65. http://dx.doi.org/10.11113/aej.v7.15492.

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The aim of this paper is to investigate the effects of mix proportion on electrical resistivity of concrete with fly ash. The electrical resistivity of concrete is measured by using four Wenner probes. The varied parameters in this study were water/binder ratio, fly ash content, and paste content. Electrical resistivity of water-saturated concrete at several different ages was studied and compared with compressive strength and rapid chloride penetration. Based on experimental results, a good relationship was obtained between results of compressive strength and rapid chloride penetration with electrical resistivity of concrete. The results of this study can be applied further to predict electrical resistivity of concrete when mix proportions are provided. According to the results, lower water/binder ratio concrete had higher resistivity than those with higher water/binder ratios. When cement was replaced at 40% by fly ash, electrical resistivity increased four times when compared to that of OPC concrete.
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Santor, M. S., A. L. G. Gastaldini, C. Crauss, G. T. Dos Santos y F. C. Rossini. "Influência de materiais de proteção na resistividade elétrica do concreto". Revista ALCONPAT 2, n.º 1 (30 de enero de 2012): 46–56. http://dx.doi.org/10.21041/ra.v2i1.26.

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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.
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Yoon, In-Seok y Chun-Ho Chang. "Effect of Chloride on Electrical Resistivity in Carbonated and Non-Carbonated Concrete". Applied Sciences 10, n.º 18 (9 de septiembre de 2020): 6272. http://dx.doi.org/10.3390/app10186272.

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The resistivity of a concrete structure exposed to chloride ions indicates the risk of early corrosion damage, because a low resistivity is related to rapid chloride penetration and to a high corrosion rate. Concrete resistivity is a geometry-independent material property that describes the electrical resistance, which is the ratio between the applied voltage and resulting current in a unit cell. The current is carried by ions dissolved in the pore liquid. While some data exist on the relationship between the moisture content and electrical resistivity of concrete, very little research has been conducted to evaluate the effect of chloride on the conduction of electricity through carbonated and non-carbonated concrete. The purpose of this study is to examine the effect of chloride concentration on the surface electrical resistivity measurement of carbonated and non-carbonated concrete. Chloride concentration had influenced the resistivity of concrete and the relationship showed a linear function. However, for concrete under the combined deterioration of carbonation and chlorides, a reduction in porosity due to the carbonation had a greater effect on the electrical resistivity than the increase in conductivity due to the chloride ions. Conclusively, this paper suggested the quantitative solution to depict the electrical resistivity of concrete with various chloride concentrations.
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Azarsa, Pejman y Rishi Gupta. "Electrical Resistivity of Concrete for Durability Evaluation: A Review". Advances in Materials Science and Engineering 2017 (2017): 1–30. http://dx.doi.org/10.1155/2017/8453095.

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Degradation processes in reinforced concrete structures that affect durability are partially controlled by transport of aggressive ions through the concrete microstructure. Ions are charged and the ability of concrete to hold out against transfer of ions greatly relies on its electrical resistivity. Hence, a connection could be expected between electrical resistivity of concrete and the deterioration processes such as increase in permeability and corrosion of embedded steel. Through this paper, an extensive literature review has been done to address relationship between concrete electrical resistivity and its certain durability characteristics. These durability characteristics include chloride diffusivity and corrosion of reinforcement as these have major influence on concrete degradation process. Overall, there exists an inverse or direct proportional correlation between these parameters. Evaluated results, from measuring the concrete electrical resistivity, can also be used as a great indicator to identify early age characteristics of fresh concrete and for evaluation of its properties, determination of moisture content, connectivity of the micropores, and even condition assessment of in-service structures. This paper also reviews and assesses research concerning the influential parameters such as environmental conditions and presence of steel rebar and cracks on measuring electrical resistivity of concrete. Moreover, concrete resistivity concept, application, and its various measurement techniques are introduced.
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Medeiros-Junior, Ronaldo Alves de, Guilherme da Silva Munhoz y Marcelo Henrique Farias de Medeiros. "Correlations between water absorption, electrical resistivity and compressive strength of concrete with different contents of pozzolan". Revista ALCONPAT 9, n.º 2 (30 de abril de 2019): 152–66. http://dx.doi.org/10.21041/ra.v9i2.335.

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This research confronts the following concrete properties: water absorptions (by immersion and capillarity), electrical resistivity and compressive strength. Concrete mixtures with two types of cement were tested. Results showed that concretes with higher content of pozzolan had higher resistivity and greater absorption by capillarity, for water/cement ratios lower than 0,60. This behavior is attributed to reduced pore diameters and microstructure densification. However, for water/cement ratio of 0,60, concrete with lower content of pozzolan presented higher absorption by capillarity. It was observed that the compressive strength and the electrical resistivity behaved inversely proportional to the water/cement ratio, and the absorption by immersion and capillarity are directly proportional to the water/cement ratio. Correlations with high determination coefficients were found between tests.
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Zhou, Renzhan, Qiang Li, Jiandong Wang, Kewen Zhou, Rui He y Chuanqing Fu. "Assessment of Electrical Resistivity and Oxygen Diffusion Coefficient of Cementitious Materials from Microstructure Features". Materials 14, n.º 12 (8 de junio de 2021): 3141. http://dx.doi.org/10.3390/ma14123141.

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A newly proposed modified non-contact electrical resistivity measurement was used to test the resistivity of concrete and cement mortar. The oxygen diffusion coefficients of concrete and mortar were determined by a gas diffusion measurement, and the capillary porosity of concrete and cement mortar was measured by mercury intrusion porosimetry (MIP) measurement. The obtained electrical resistivity and capillary porosity results were verified with other researchers’ data, the measured electrical resistivity results can be estimated by a simple equation from the capillary porosity results. The obtained oxygen diffusion coefficient results were quantitatively correlated with capillary porosity and electrical resistivity measurement results. The proposed equations can be practically used to assess the electrical resistivity and oxygen diffusion coefficient.
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Tesis sobre el tema "Concrete electrical resistivity"

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Malakooti, Amir. "Investigation of Concrete Electrical Resistivity As a Performance Based Test". DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/6858.

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The purpose of this research project was to identify the extent that concrete resistivity measurements (bulk and/or surface) can be used as a performance based lab test to improve the quality of concrete in Utah bridge decks. By allowing UDOT to specify a required resistivity, concrete bridge deck quality will increase and future maintenance costs will decrease. This research consisted of two phases: the field phase and the lab phase. In the field phase, concrete samples were gathered from local concrete producers in Utah. These concrete samples were made with common concrete mixes used in bridge decks across the state of Utah. Testing multiple mix designs allowed the research team to investigate several variations of concrete constituents, for instance, water to cement ratio, common Utah supplementary cementitious materials, curing type, and aggregate type. Mechanical and durability testing was performed on concrete of different ages. These tests included strength, surface resistivity, bulk resistivity, rapid chloride permeability, and freeze and thaw tests. In the lab phase, one of the field mixes was selected as the control mix. This mix was then duplicated in the lab in order to see the performance differences of each mix in the controlled and field experiments. In addition, changes were made to the lab control mix, to see the effect of different materials on the resistivity and durability of concrete.
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2

Xiao, Lianzhen. "Interpretation of hydration process of concrete based on electrical resistivity measurement /". View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202007%20XIAO.

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Wang, Boyu. "Durability evaluation of cement-based repair materials used for corrosion-damaged steel-reinforced concrete structures". Thesis, 1st International Conference on New Horizons in Green Civil Engineering (NHICE), 2018. https://dspace.library.uvic.ca//handle/1828/9330.

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Concrete repair materials are being widely used to restore and extend the service life of structures. While most cement-based repair materials are compatible with concrete structures, their durability properties do not attract much attention which it deserves from researchers. Since repair materials can deteriorate like conventional concrete, the search for reliable, long-lasting concrete repair materials is becoming more intensive. Amongst other factors, concrete permeability and chloride diffusivity within concrete are believed to play a major role in determining the durability and success of the repair. These two parameters determine the penetration rate of aggressive substances into concrete and how fast degradation could take place. A number of test methods have been proposed to study these two factors, and the commonly used test methods are water penetration, surface/bulk electrical resistivity, rapid chloride permeability (RCP), and half-cell potential. However, the relationship between each durability test method and their correlation with compressive strength measurement have not been fully understood. So, in this study, we aim for using multiple testing techniques, destructive and non-destructive, to evaluate the durability of concrete repair materials as well as correlating different test methods. Three types of commercially available cement-based materials are tested and evaluated, and results have indicated that cementitious concrete mortar (termed as Mix M) amongst others has the best durability performance which means low water permeability, high resistivity, and compressive strength. Whereas, the flexural performance of Mix M still needs some improvement in terms of flexural strength and flexural toughness. For various durability testing methods, surface resistivity is found to have a strong linear relation and a polynomial relation to bulk resistivity and water permeability respectively. No relationship is established between concrete resistivity and compressive strength, though high-strength concrete tends to have a high resistivity in our study. RCP test results do not correlate well with resistivity measurements, which requires further study to overcome its heating and binding effect when measurements are being taken. Half-cell potential method is used for validating test results but it reveals no difference for materials with different permeability and resistivity. A model is proposed to counteract temperature’s effect while calculating the coefficient of diffusion, which indicates the concrete to resist chloride diffusion. It is found that this model can shift the RCP measurement slightly closer to its theoretical prediction but the difference between them is still large. Therefore, further research is required for acquiring more raw data from RCP measurements as the regression analysis input. In addition, a more comprehensive model that involves more correction factors for binding effects, etc., is also needed.
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2020-04-30
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4

Barrus, Natasha Christine. "Sensitivity of Resistivity Measurements on Concrete Bridge Decks to Operator-Controlled and Concrete Material Variables". BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3203.

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The objectives of this research were to investigate the sensitivity of two-prong and fourprong resistivity measurements to certain operator-controlled variables and to conduct a direct comparison of the sensitivity of two-prong and four-prong resistivity measurements to certain concrete material variables. Four full-factorial experiments were designed for this research. In the experimentation on operator-controlled variables with two-prong resistivity testing, main effects that are both statistically significant and practically important include hole depth and surface water. In the experimentation on operator-controlled variables with four-prong resistivity testing, probe position, surface water, and prong spacing are all neither statistically significant nor practically important. This high degree of unexplained variation may be of concern to practitioners. In the experimentation on concrete material variables with two-prong and four-prong resistivity testing, main effects that are both statistically significant and practically important include chloride concentration and temperature, both of which exhibit inverse relationships with resistivity. These research findings support several important recommendations for resistivity testing. Operators of the two-prong resistivity device should use an accurately positioned drill stop to ensure that the prepared holes are consistently the correct depth, and they should expect to obtain different values depending on the presence of surface water on the deck surface. Operators considering use of the four-prong resistivity device should not expect the measurements to be sensitive to probe position with respect to rebar, presence of surface water, or prong spacing for conditions similar to those investigated in this research. Operators interested in monitoring resistivity values over time to ascertain material changes in a bridge deck should develop protocols for measuring concrete temperature in the field and subsequently normalizing resistivity measurements to a standard temperature.
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Barton, Jeffrey David. "Vertical Electrical Impedance Measurements on Concrete Bridge Decks Using a Large-Area Electrode". BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6981.

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In regions where chloride-based deicing salts are applied to bridge decks, corrosion of the interior steel reinforcement is a major problem. Vertical electrical impedance (VEI) is an effective measurement technique to quantitatively assess the cover protection on bridges against aggressive chemical penetration of reinforced concrete. In its current form, traditional vertical electrical impedance is time-consuming and destructive because a direct connection to the reinforcing steel is required to provide a ground reference. A new method using a large-area electrode (LAE) permits VEI measurement without a direct electrical connection to the steel reinforcement. The LAE creates a nondestructive, semi-direct, low impedance connection between the measurement electronics and the reinforcing steel. In this work, numerical simulations are performed on common electrode arrangements to demonstrate the effectiveness of the LAE when significant variations in concrete conductivity exist. Physical experiments of a large-area electrode are carried out in the laboratory and field to validate the numerical simulations and to provide additional comparisons with the traditional tapped steel reinforcement method. The results of this study are a set of important design considerations for VEI utilizing a LAE to connect to the underlying rebar. Using these design considerations, the large-area electrode method was validated using both an analytical and a finite-element model, laboratory experiments, and field experiments on two bridges in Utah. The validation results indicate the LAE can replace the direct connection to the reinforcing steel. As a result of this work, a multichannel VEI scanner which uses the LAE method was built which can provide VEI information for bridge engineers and managers to better rehabilitate deteriorating reinforced concrete.
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Deda, Hugo. "The Influence of the Binder Type & Aggregate Nature on the Electrical Resistivity and Compressive Strength of Conventional Concrete". Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/41463.

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Concrete has been used in a number of civil engineering applications due to its interesting fresh, hardened, and durability-related properties. 28-day compressive strength is the most important hardened state property and is frequently used as an indicator of the material’s quality. However, early-age mechanical properties are a key factor nowadays to enhance construction planning. Several advanced techniques have been proposed to appraise concrete microstructure and quality, and among those electrical resistivity (ER) is one of the most commonly used since it is a non-destructive and low-cost technique. Although recent literature data have shown that ER may be significantly influenced by a variety of parameters such as the test setup, material porosity and moisture content, binder type/amount and presence of supplementary cementing materials (SCMs) along with the nature of the aggregates used in the mix, further research must be performed to clarify the influence of the raw materials (i.e. SCMs and aggregate nature) on ER using distinct setups. Therefore, this work aims to appraise the influence of the coarse aggregate nature and binder replacement/amount on the concrete ER and compressive strength predictions models through ER. Twenty-four concrete mixtures were developed with two different coarse aggregate natures (i.e. granite and limestone), two different water-to-binder ratios (w/b; i.e. 0.6 and 0.4) and incorporating two different SCMs (i.e. slag and fly-ash class F) with different replacement levels. Moreover, three distinct ER techniques (e.g. bulk, surface, and internal) and compressive strength tests were performed at different ages (i.e. 3, 7, 14, and 28 days). Results indicate that the binder type and replacement amount significantly affect ER and compressive strength. Otherwise, the coarse aggregate nature presented only trivial influence for 0.6 w/b mixes, except for 50% fly-ash replacement samples; whereas for concrete specimens with enhanced microstructure (i.e. 0.4 w/b), the aggregate nature influence was statically significant especially for the binary mixtures with high SCMs replacement levels (i.e. 70% GGBS and 50% fly-ash). Finally, all ER test setups were considered to be quite suitable and reliable NDT techniques correlating themselves very well. Yet the internal resistivity setup demonstrated to be the device which yields the lowest variability amongst them.
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Rosa, Dalton Wegner da. "RESISTIVIDADE ELÉTRICA DE CONCRETOS COM DIFERENTES TEORES DE ESCÓRIA DE ALTO FORNO E ATIVADOR QUIMICO". Universidade Federal de Santa Maria, 2005. http://repositorio.ufsm.br/handle/1/7942.

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The integrity of the rebars in reinforced concrete structures is related to the chemical and physical protection provided by the concrete layer that covers the steel. The destruction of the passivation layer precedes the onset of corrosion. Once the corrosion process starts, its rate of propagation will depend on the electrical resistivity between cathode and anode and the amount of oxygen available on the cathode. Concrete resistivity is a property linked both to the chemical and physical properties of the concrete. This study investigated the effect of the addition of blast furnace slag (BFS) on the electrical resistivity of concrete and correlated the effects of this addition on the concrete compressive strength as well as on changes in the chemical composition of aqueous phase and pore structure. Test specimens were prepared using different water/binder ratios (0.35, 0.50 and 0.65) and substitutions of 50 and 70% of BFS for cement by weight. A control sample (no BFS) was also prepared. Additionally, the effect of 4% sodium sulfate (Na2SO4) in samples with 50% BFS was also investigated. The electrical resistivity of concrete was determined using the fourelectrode method (Wenner s method adapted for use in concrete). Tests of compressive strength, porosimetry, electrical conductivity in the pore solution and the concentration of ions in the aqueous phase were performed. The tests showed there is an increase in the electrical resistivity of concrete as the degree of hydration and the concentration of BFS increase. This is related to the lower specific conductivity of the pore solution and the reduction in concrete pore size, which is shown by the good correlation between these two factors. The binary mixture with 50% BFS (50E) showed the best cost/benefit ratio for strength levels of 30MPa and 50MPa at 28 days and also for the strength level of 50MPa at 91 days.
A manutenção da integridade das armaduras nas estruturas de concreto é uma conseqüência da proteção física e química do concreto sobre o aço. A destruição da camada passivadora antecede o processo corrosivo. Uma vez iniciada a corrosão, a velocidade desta dependerá da resistividade elétrica existente entre o ânodo e o cátodo e também pela quantia de oxigênio presentes junto ao cátodo. A resistividade do concreto caracteriza-se por ser uma propriedade ligada tanto a características físicas como químicas do mesmo. Neste trabalho objetivou-se estudar o comportamento da adição de escória de alto forno na resistividade elétrica aparente dos concretos, assim como correlacionar com a resistência à compressão e as alterações químicas na fase aquosa bem como na estrutura dos poros. Foram realizadas investigações em misturas com relação a/agl 0,35, 0,50 e 0,65 com teores de substituição em massa de 0, 50 e 70% de EAF. Investigou-se também os efeitos produzidos pela incorporação de 4% de sulfato de sódio (Na2SO4) em misturas contendo 50% de EAF. A resistividade elétrica do concreto foi determinada utilizando o método dos quatro eletrodos (método de Wenner adaptado para uso em concreto). Foram também realizados ensaios de resistência à compressão axial, porosimetria, concentração de íons da fase aquosa e determinada a condutividade elétrica específica da solução dos poros. Constatou-se aumento na resistividade elétrica do concreto com o aumento no grau de hidratação e do teor de escória. Este comportamento está relacionado a menor condutividade elétrica específica da solução dos poros e ao refinamento dos poros comprovado pela boa correlação entre esses dois fatores. A mistura binária composta por 50% de escória (50E) apresentou a melhor relação custo/benefício para os níveis de resistência de 30MPa e 50MPa aos 28 dias e também para o nível de resistência de 50MPa aos 91 dias.
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Santor, Marcelo Silva. "INFLUÊNCIA DE MATERIAIS DE PROTEÇÃO SUPERCIAL NA RESISTIVIDADE ELÉTRICA E ABSORÇÃO CAPILAR DO CONCRETO". Universidade Federal de Santa Maria, 2011. http://repositorio.ufsm.br/handle/1/7762.

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The durability of concrete structures is the result of protective action of concrete over the rebar. When the passivation of steel ceases to exist the structure becomes vulnerable to the phenomenon of corrosion, which spread after start is largely controlled by the electrical resistivity of concrete. Another important factor in the durability of concrete structures is the absorption, which is one of the properties governing the transport of ions inside the concrete. This study aimed to evaluate the electrical resistivity and capillary absorption of concrete that have undergone surface treatment: a monolithic polymeric mortar applied in a layer of 4mm, and a pore blocker with a single coat and a pore blocker with a double coat. The concrete surface subjected to treatment were made with three types of cement,CP IV-32, CP II-F 32 and CP V and levels of compressive strength of 15MPa, 20MPa and 25MPa. The electrical resistivity was measured by the method of four electrodes and capillary absorption by the method NBR 9779. Treatment with the pore blocker with a double coat was more effective in reducing capillary absorption than a pore blocker with a single coat for the three types of cement, but the best results were obtained using the polymer mortar. In this work the pozzolanic effect present on cement CP IV became more clear in the result of electrical resistivity for all treatment studied. The different behavior of the electrical resistivity of concrete with cement CP IV in relation to others, CPII F and CP V, is justified by changes in the microstructure of the paste, pore refinement and composition of pore solution. In addition to this, when compared to concrete made with CP V, the lower relations/binder of CP IV to obtain the compressive strengh levels investigated, fck = 15 Mpa , 20Mpa and 25Mpa. Even the reference concrete without surface treatment showed values of resistivity well above the actual reference compounds with CP II-F and CP V and also subjected to surface treatment.
A 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. Outro fator importante na durabilidade das estruturas do concreto é a absorção capilar, a qual é uma das propriedades que regem o transporte de íons no interior do concreto. O presente estudo teve por objetivo avaliar a resistividade elétrica e a absorção capilar em concretos que foram submetidos a tratamento superficial: uma argamassa polimérica monocomponente aplicada em camada de 4mm, e um produto obturador dos poros aplicado em uma e duas demãos. Os concretos submetidos ao tratamento superficial foram produzidos com três tipos de cimento, CP IV 32, CP II F 32 e CP V, e para os níveis de resistência à compressão de 15MPa, 20MPa e 25MPa. A resistividade elétrica foi medida pelo método dos quatros eletrodos e a absorção capilar segundo o método NBR 9779. O tratamento com o produto obturador dos poros em dupla demão mostrou-se mais efetivo na redução da absorção capilar do que o tratamento com uma demão para os três tipos de cimento, contudo, os melhores resultados foram obtidos com o uso da argamassa polimérica. Neste trabalho o efeito pozolânico presente no cimento CP IV ficou claro nos resultados de resistividade elétrica para todos os tratamentos estudados. Este comportamento diferenciado do CP IV em relação aos demais, CP II F e CP V, se justifica pelas alterações na microestrutura da pasta, refinamento dos poros e composição da solução dos poros. Acresce a isto, quando comparado aos concretos produzidos com CP V, as menores relações a/agl do CP IV para obtenção dos níveis de resistência à compressão investigados. Mesmo o concreto de referência sem tratamento superficial apresentou valores de resistividade elétrica muito superiores aos concretos de referência compostos com CP II F e CP V e também submetidos a tratamento superficial.
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Braun, Carlos Eduardo. "Determinação instantânea da relação água-cimento e da resistência à compressão do concreto no estado fresco através do método da resistividade elétrica". Universidade do Vale do Rio dos Sinos, 2015. http://www.repositorio.jesuita.org.br/handle/UNISINOS/5002.

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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
PROSUP - Programa de Suporte à Pós-Gradução de Instituições de Ensino Particulares
Durante a execução de elementos de concreto no canteiro de obras, procedimentos de controle de qualidade do concreto são adotados com o objetivo de verificar se o material atende às características de projeto. Esta verificação também visa evitar falhas durante as etapas subsequentes da construção, que podem levar até à inviabilização do empreendimento. Estudos sobre métodos que têm como objetivo estimar a relação água/cimento (a/c) do concreto no estado fresco vêm recebendo maior atenção nos últimos tempos, devido à importância deste parâmetro sobre a resistência e durabilidade das estruturas de concreto, e por não existirem métodos práticos e precisos disponíveis até o momento, que permitam a sua determinação após a realização da mistura. Estudos sobre o método da resistividade elétrica apontam para uma forte correlação entre os valores de resistividade e a relação água/cimento do concreto no estado fresco, possibilitando a utilização do método como uma interessante alternativa para determinação da relação a/c. O presente estudo tem como objetivo apresentar uma análise do método da resistividade elétrica, aplicado à estimativa de valores de relação água/cimento de concretos no estado fresco, confeccionados com cimentos nacionais, além da estimativa de valores de resistência à compressão axial do concreto no estado endurecido. Foram realizados ensaios com concretos dosados a partir do método IPT/EPUSP para seis cimentos nacionais (CPV-ARI, CPIV-32, CPIII-40, CPII-Z-32, CPII-F-32 e CPII-E-40), variando-se a relação a/c (0,35, 0,45, 0,55 e 0,65), utilizando uma sonda aprimorada para realização dos testes, a qual foi desenvolvida neste estudo com base num protótipo já desenvolvido anteriormente. Os resultados obtidos apontam para uma forte correlação existente entre a resistividade elétrica do concreto no estado fresco e a relação a/c, com valores médios das estimativas para relação a/c dentro do intervalo de ±0,02, com relação aos valores efetivos das misturas testadas. A margem de erro média para as estimativas de relação a/c, considerando-se todos os cimentos testados, ficou no intervalo entre 2,25% e 9,38%. Foram obtidos coeficientes de determinação na ordem de 85,7% a 95,2% para as estimativas de resistência à compressão, mostrando que é possível determinar tanto a relação a/c quanto a resistência à compressão do concreto através do método da resistividade elétrica, quando o material encontra-se ainda no estado fresco.
During construction of concrete elements in the building site, quality control proceedings are adopted in order to verify if the concrete reaches its design specifications, which also avoids failures during the subsequent stages of the construction. Test methods used for the determination of the water-cement (w/c) ratio have received increased attention, due to the importance of this ratio for the concrete resistance and durability, and also because there isn’t any practical and sufficiently precise method available at the moment, which could be used for determining water-cement ration after mixing. Studies about the electrical resistivity method have shown a strong relationship between the measured resistivity values and water-cement ratio, for the fresh concrete, making this method an interesting alternative for determining w/c ratio. This study presents an analysis of the electrical resistivity method, applied to determine the water-cement ratio of several fresh concrete mixtures made with different types of Brazilian cements, in addition to estimates of compressive strength values of the hardened concretes. Concrete mixtures were made out of six cement types (CPV-ARI, CPIV-32, CPIII-40, CPII-Z-32, CPII-F-32 and CPII-E-40), dosed by the IPT/EPUSP method, and four water-cement ratios (0.35, 0.45, 0.55 and 0.65). Tests were performed using an improved probe, developed in this study, based in one prototype developed previously. Results shown a strong relationship between the electrical resistivity of fresh concrete and its water-cement ratio, with average estimated values within ±0,02 of the actual water-cement ratio values for the mixtures tested. The average error for the w/c ratio estimated values, considering all of the cements tested, was between 2,25% and 9,38%. The compressive strength estimates reached coefficients of determination between 85,7% and 95,2%, showing that it is possible to estimate both w/c ratio and compressive strength of concrete while still in the fresh state with the electrical resistivity method presented here.
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Chabi, Parham. "Comparative Investigation of Detection Techniques for Chloride-induced Corrosion of Loaded Reinforced Concrete Slabs". Thesis, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23170.

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This study involved a comparative investigation of chloride-induced corrosion detection techniques on loaded reinforced concrete slabs which were exposed to deicing salts and wetting-drying cycles to simulate typical aggressive environments in cold climates. The studied techniques involved linear polarization technique, galvanostatic pulse technique, electrochemical impedance spectroscopy, half-cell potential and concrete electrical resistivity mapping. The results showed that concrete quality and moisture content have a direct effect on corrosion activity, and these properties are represented well with concrete electrical resistivity. The galvanostatic pulse technique was shown to correlate well with electrochemical impedance spectroscopy, which was used as a benchmark for corrosion rate measurements in this study; however, the galvanostatic pulse technique was not capable of detecting corrosion activity in saturated concrete accurately. The results of this research do not support the criteria provided by the ASTM C876-09 standard for using half-cell potentials to estimate the probability of reinforcing steel corrosion in reinforced concrete structures.
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Capítulos de libros sobre el tema "Concrete electrical resistivity"

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Sengul, O. "Factors Affecting the Electrical Resistivity of Concrete". En Nondestructive Testing of Materials and Structures, 263–69. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0723-8_38.

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Akhnoukh, Amin. "Overview of Concrete Durability Evaluation Using Electrical Resistivity". En Collaboration and Integration in Construction, Engineering, Management and Technology, 9–14. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-48465-1_2.

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Reichling, Kenji, Michael Raupach y Norbert Klitzsch. "Visualisation of the Electrical Resistivity Distribution of Reinforced Concrete". En Durability of Reinforced Concrete from Composition to Protection, 1–10. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09921-7_1.

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Lataste, J.-F. y D. Breysse. "A Study on the Variability of Electrical Resistivity of Concrete". En Nondestructive Testing of Materials and Structures, 255–61. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0723-8_37.

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Balestra, C. E. T., T. A. Reichert y G. Savaris. "Concrete Electrical Resistivity as a Durability and Service Life Parameter for Reinforced Concrete Structures". En Durability of Concrete Structures, 51–61. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-62825-3_4.

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Xu, Zhi Hong y Zhi Tian Liu. "Fatigue Damage Sensing in Smart Carbon Fiber Concrete by Electrical Resistivity Measurement". En Advances in Fracture and Damage Mechanics VI, 345–48. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-448-0.345.

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Lencioni, J. W. y M. G. Lima. "A Study of the Parameters that Affect the Measurements of Superficial Electrical Resistivity of Concrete". En Nondestructive Testing of Materials and Structures, 271–76. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0723-8_39.

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"THERMAL RESISTIVITY OF CONCRETE". En Electrical Power Cable Engineering, 249–60. CRC Press, 2003. http://dx.doi.org/10.1201/9781482287820-22.

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Li, Huajian, Lu Yang, Zhonglai Yi, Yanbin Tan y Yongjiang Xie. "Correlation research on the electrical resistivity of concrete and its other electrical properties". En Concrete Solutions 2014, 677–81. CRC Press, 2014. http://dx.doi.org/10.1201/b17394-104.

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"Non-destructive electrical resistivity measurement technique: Evaluation of concrete strengths". En Concrete Solutions 2011, 363–72. CRC Press, 2011. http://dx.doi.org/10.1201/b11585-52.

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Actas de conferencias sobre el tema "Concrete electrical resistivity"

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Pereira, Isabel, Eduardo B. Pereira y Tiago Miranda. "Electrical Resistivity of Sustainable Fiber Reinforced Concretes for Smart Marine Structures". En IABSE Symposium, Guimarães 2019: Towards a Resilient Built Environment Risk and Asset Management. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/guimaraes.2019.0649.

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<p>Self-monitoring structural materials have recently raised renovated attention due to their potential to enable continuous low-cost monitoring of next-generation smart-structures. This characteristic is particularly important in harsh environments such as highly energetic marine coastal areas, where structural damage due to excessive loading is frequent and very impactful in the performance of structures. In the context this research a sustainable fiber reinforced conductive concrete was developed and studied, with the aim of enabling the future development of self-sensing structural materials and systems for marine harsh environments. The variation of the electrical resistivity with curing time, as well as the compressive load <i>versus </i>displacement responses were investigated. Results indicated that the self-monitoring is possible with sustainable formulations that lead to reasonably conductive concretes. The experimental results seem to indicate that electrical resistivity can be a good parameter for self-monitoring of concrete structures.</p>
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Larsen, C. K. "Electrical resistivity of concrete - Part II: Influence of moisture content and temperature". En 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering. RILEM Publications, 2006. http://dx.doi.org/10.1617/2351580028.100.

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Lataste, J. F. "Improvement of electrical resistivity measurement for non destructive evaluation of concrete structures". En 2nd International RILEM Workshop on Life Prediction and Aging Management of Concrete Structures. RILEM Publications SARL, 2003. http://dx.doi.org/10.1617/2912143780.009.

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"Experimental Analysis of the Variation of Electrical Resistivity of Concrete after Fracture". En Non-Conventional Materials and Technologies. Materials Research Forum LLC, 2018. http://dx.doi.org/10.21741/9781945291838-64.

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Larsen, C. K. "Electrical resistivity of concrete - Part III: Long term field measurements on concrete elements in the tidal zone". En 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering. RILEM Publications, 2006. http://dx.doi.org/10.1617/2351580028.101.

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Østvik, J.-M. "Electrical resistivity of concrete - Part I: Frequency dependence at various moisture contents and temperatures". En 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering. RILEM Publications, 2006. http://dx.doi.org/10.1617/2351580028.105.

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Wickramanayake, Sathira, Karthick Thiyagarajan, Sarath Kodagoda y Lasitha Piyathilaka. "Frequency Sweep Based Sensing Technology for Non-destructive Electrical Resistivity Measurement of Concrete". En 36th International Symposium on Automation and Robotics in Construction. International Association for Automation and Robotics in Construction (IAARC), 2019. http://dx.doi.org/10.22260/isarc2019/0173.

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Abdualla, Hesham, Halil Ceylan, Sunghwan Kim y Kasthurirangan Gopalakrishnan. "Effect of Temperature Variations on Electrical Resistivity of Conductive Concrete Heated Pavement System". En International Airfield and Highway Pavements Conference 2019. Reston, VA: American Society of Civil Engineers, 2019. http://dx.doi.org/10.1061/9780784482476.006.

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Miri, Alireza, Rojina Ehsani y Fariborz M. Tehrani. "A Numerical Simulation of the Electrical Resistivity of Concrete Pavements Containing Steel Fibers". En International Airfield and Highway Pavements Conference 2021. Reston, VA: American Society of Civil Engineers, 2021. http://dx.doi.org/10.1061/9780784483510.032.

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Azba, Abdulla H. y Bayan S. Alnuman. "Strength and electrical resistivity of recycled concrete made of aggregates from waste bricks". En 2021 7th International Engineering Conference “Research & Innovation amid Global Pandemic" (IEC). IEEE, 2021. http://dx.doi.org/10.1109/iec52205.2021.9476139.

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Informes sobre el tema "Concrete electrical resistivity"

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Weiss, W. Jason, Chunyu Qiao, Burkan Isgor y Jan Olek. Implementing Rapid Durability Measure for Concrete Using Resistivity and Formation Factor. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317120.

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The durability of in-place concrete is a high priority issue for concrete pavements and bridges. Several studies have been conducted by INDOT to use electrical resistivity as a measure of fluid transport properties. Resistivity is dependent on the chemistry of the cement and supplementary cementitious system used, as such it has been recommended that rather than specifying resistivity it may be more general to specify the formation factor. Samples were tested to establish the current levels of performance for concrete pavements in the state of Indiana. Temperature and moisture corrections are presented and acceptable accelerated aging procedure is presented. A standardized testing procedure was developed (AASHTO TP 119–Option A) resulting in part from this study that provides specific sample conditioning approaches to address pore solution composition, moisture conditioning, and testing procedures. An accelerated aging procedure is discussed to obtain later age properties (91 days) after only 28 days.
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Ley, M., Zane Lloyd, Shinhyu Kang y Dan Cook. Concrete Pavement Mixtures with High Supplementary Cementitious Materials Content: Volume 3. Illinois Center for Transportation, septiembre de 2021. http://dx.doi.org/10.36501/0197-9191/21-032.

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Fly ash is a by-product of coal combustion, made up of particles that are collected through various methods. This by-product has been used successfully as a partial Portland cement replacement in concrete, but the performance predictions of fly ash in concrete have been difficult to predict, especially at high fly ash replacement rates. This study focuses on comparing the performance of concrete with a variety of fly ash mixtures as well as the particle distribution and chemical makeup of fly ash. The slump, unit weight, compressive strength, and isothermal calorimetry tests were used to measure the performance of concrete at 0%, 20%, and 40% fly ash replacement levels. The particle distribution of fly ash was measured with an automated scanning electron microscope. Additionally, the major and minor oxides from the chemical makeup of fly ash were measured for each mixture and inputted into a table. The particle distribution and chemical makeup of fly ash were compared to the performance of slump, unit weight, compressive strength, isothermal calorimetry, and surface electrical resistivity.
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