Presumption of deterioration concrete strength by small

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Presumption of deterioration concrete strength by small ...

Presumption of deterioration concrete strength by small size core and X-ray technique with contrast medium Mitsuhiro TAKEDA 1, Koji OTSUKA2 1 Tohoku-Gakuin university, Tagajo, Japan, [email protected] 2 Tohoku-Gakuin university, Tagajo, Japan, [email protected] Abstract This paper proposes a method of evaluating the strength of concrete below a

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Presumption of deterioration concrete strenght by small ...

Session: Concrete Properties; ARTICLE Presumption of deterioration concrete strenght by small size core and X-ray technique with contrast medium Mitsuhiro Takeda, Koji Otsuka Tohoku-Gakuin University, Tagajo, Japan View: Paper . Post Your Feedback Share: Product Spotlight. AxSEAM Scanner . Stand Olympus Scientific Solutions Americas. Optimized for long seam weld inspection, such as in electric ...

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Types and Causes of Concrete Deterioration

Types and Causes of Concrete Deterioration Fig. 4. Deicing salts are a major cause of corrosion of reinforcing steel in concrete. (55807) Table 2. Maximum Chloride Ion Content of Concrete (ACI 318) Maximum Type of Member Cl-* Prestressed concrete 0.06 Reinforced concrete exposed to chloride in service 0.15 Reinforced concrete that will be dry or protected from moisture in service 1.00 Other ...

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Types and Causes of Concrete Deterioration

Types and Causes of Concrete Deterioration Fig. 4. Deicing salts are a major cause of corrosion of reinforcing steel in concrete. (55807) Table 2. Maximum Chloride Ion Content of Concrete (ACI 318) Maximum Type of Member Cl-* Prestressed concrete 0.06 Reinforced concrete exposed to chloride in service 0.15 Reinforced concrete that will be dry or protected from moisture in service 1.00 Other ...

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Concrete Deterioration - an overview ScienceDirect Topics

M.A. Murray, in Failure, Distress and Repair of Concrete Structures, 2009 11.7 Recommendations. Patching of localized areas of concrete deterioration has proven to be an effective means to increase the life expectancy of a structural element. To maximize the benefits of repairs that incorporate patching that is the result of corrosion, the reinforcing steel that has been encountered must have ...

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Deterioration of modern concrete structures and asphalt ...

13/05/2021  1. Introduction. The resolution of causes for damage in cement concrete structures is an important issue for the useful life of structures. To investigate the damage in concrete, a phenolphthalein solution is commonly applied to a cross section of the concrete and the extent of deterioration of the concrete is evaluated by the color corresponding to the reaction products, i.e. the value of pH ...

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7th International Symposium on Nondestructive Testing in ...

Presumption of deterioration concrete strenght by small size core and X-ray technique with contrast medium: 33: L. Le Marrec 1, M. Chekroun 3, G. Villain 3, O. Abraham 3, L. Rakotomanana 1 1 University Rennes, Rennes [France] 2 Electricité de France (EDF) RD, Chatou [France] 3 Nantes Angers le Mans University, Laboratoire Central des Ponts et Chaussées (LCPC), Bouguenais [France] Analytical ...

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Strength Deterioration of Concrete in Sulfate Environment ...

22/06/2015  The deterioration trend of concrete strength and development law of sulfate-induced concrete corrosion depth under sulfate attacks were experimentally studied. The damaged concrete section is simply but reasonably divided into uncorroded and corroded layers and the two layers can be demarcated by the sulfate corrosion depth of concrete. The accelerated corrosion test results

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Concrete Scaling: Ways to Fix and Prevent it - The Constructor

Other factors that may contribute to the initiation of concrete scaling are the use of low-strength concrete, deicing salts, and a high water-cement ratio in a concrete mixture. The process of concrete scaling begins with small patches, but develops and merges with the larger patches and broader areas if it is not repaired soon. The scaling in concrete can be fixed by cleaning the deteriorated ...

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Defects in Concrete Structures - Types Causes, Prevention ...

The use of water containing salt for making concrete can also contribute to deterioration of the concrete. The design of concrete mix can be satisfactorily carried out using a wide variety of aggregates. A reasonable continuity of grading of aggregates should be ensured. Excessive use of water in the concrete mix is the largest single source of weakness. The accuracy of weighing the various ...

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The assessment of corrosion-damaged concrete structures

(ii) Bond strength. (iii) Flexural strength. (iv) Shear strength. (v) Column behaviour. Models have been developed to link material and structural aspects of deterioration. Despite the complexity of the behaviour, many of the models are modifications to existing procedures contained in UK codes. Material and structural models are integrated together in a spreadsheet for assessing the variation ...

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Honeycombing of concrete.

Small, shallow areas of honeycombing are probably mainly cosmetic. However, deeper areas will lead to a local reduction in the protection to the reinforcement from the concrete cover and hence possibly durability problems in the future. × . Acknowledgement: The Concrete Society Concrete Bookshop - Members receive 40% discount on Concrete Society publications. TR54 Diagnosis of deterioration ...

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Corrosion of Embedded Materials - PCA

Corrosion of Embedded Metals. Corrosion of reinforcing steel and other embedded metals is the leading cause of deterioration inconcrete. When steel corrodes, the resulting rust occupies a greater volume than the steel. This expansion creates tensile stresses in the concrete, which can eventually cause cracking, delamination, and spalling.

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Study on the Deterioration of Concrete under Dry-Wet Cycle ...

In order to study the deterioration and mechanism of dry-wet cycles and sulfate attack on the performance of concrete in seaside and saline areas, the deterioration of compressive strength of concrete with different water cement ratios under different erosion environments (sodium sulfate soaking at room temperature and coupling of dry-wet cycling and sodium sulfate) was studied here.

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Deterioration of modern concrete structures and asphalt ...

13/05/2021  1. Introduction. The resolution of causes for damage in cement concrete structures is an important issue for the useful life of structures. To investigate the damage in concrete, a phenolphthalein solution is commonly applied to a cross section of the concrete and the extent of deterioration of the concrete is evaluated by the color corresponding to the reaction products, i.e. the value of pH ...

Get Price

7th International Symposium on Nondestructive Testing in ...

Presumption of deterioration concrete strenght by small size core and X-ray technique with contrast medium: 33: L. Le Marrec 1, M. Chekroun 3, G. Villain 3, O. Abraham 3, L. Rakotomanana 1 1 University Rennes, Rennes [France] 2 Electricité de France (EDF) RD, Chatou [France] 3 Nantes Angers le Mans University, Laboratoire Central des Ponts et Chaussées (LCPC), Bouguenais [France] Analytical ...

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Concrete Scaling: Ways to Fix and Prevent it - The Constructor

Other factors that may contribute to the initiation of concrete scaling are the use of low-strength concrete, deicing salts, and a high water-cement ratio in a concrete mixture. The process of concrete scaling begins with small patches, but develops and merges with the larger patches and broader areas if it is not repaired soon. The scaling in concrete can be fixed by cleaning the deteriorated ...

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Degradation behavior of concrete under corrosive coal mine ...

01/03/2019  The compressive strength of concrete increased at the initial stage of deterioration, and then decreased until the time of 135 days when they came to the second ascension of small quantity and then entered the decline trend under the coupling effect of carbonization and acid-salt attack. The elastic modulus changed slightly with the deterioration, meanwhile the fragility and ductility changed ...

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Non-Destructive Testing of Concrete: A Basic Guide ...

Concrete Test Hammer - Is used to estimate the strength and assess the in-place uniformity of concrete, and can delineate regions of poor quality or deteriorated concrete. A spring-loaded hammer is released to impact against a piston in contact with the concrete surface, and a sliding indicator records the distance the hammer bounces back on a linear scale. The rebound number is then cross ...

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The assessment of corrosion-damaged concrete structures

(ii) Bond strength. (iii) Flexural strength. (iv) Shear strength. (v) Column behaviour. Models have been developed to link material and structural aspects of deterioration. Despite the complexity of the behaviour, many of the models are modifications to existing procedures contained in UK codes. Material and structural models are integrated together in a spreadsheet for assessing the variation ...

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A simplified approach for prediction of concrete ...

09/07/2021  Concrete strength for chloride-induced PC I specimen with 0.45 W/C ratio was expectedly lower than for concrete specimens without chloride content (e.g., PC II). The statistical analysis shows that the average concrete strength for the specimen with 0.55 W/C ratio was also lower than for basic specimen with a 0.45 W/C ratio. The result show that the W/C ratio will affects concrete strength ...

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5 Concrete Structure Defects [Causes Prevention Repair ...

Check the concrete strength of the repairing wall. A higher grade concrete mixed with expansion reagent is used to repair the holes. After 12 hours of repairing, watered the parts, and the curing time > 5 days. 4. Exposed Steel Reinforcement. In the process of concrete grouting, the vibration is not in place, the protective cushion is not set or fixed firmly, the concrete slump is small, the ...

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Corrosion of Embedded Materials - PCA

Corrosion of Embedded Metals. Corrosion of reinforcing steel and other embedded metals is the leading cause of deterioration inconcrete. When steel corrodes, the resulting rust occupies a greater volume than the steel. This expansion creates tensile stresses in the concrete, which can eventually cause cracking, delamination, and spalling.

Get Price