Influence of Combined Actions on Durability and Service Life of Reinforced Concrete Structures Exposed to Aggressive Environment

Wittmann, Folker H.; Zhao, Tong; Jiang, Fu Xiang; Wan, Xiao Mei

doi:10.1515/rbm-2012-6510

Cited by 17 publications

(9 citation statements)

References 1 publication

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“…(5) (6) (7) where ε e , ε p , ε ep are relative elastic, plastic deformations of elastic consequences.…”

Section: Figure 2: Experimental Degradation Modelsmentioning

confidence: 99%

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Forecasting the Durability of Composite Materials Products under the Combined Action of Mechanical Loads and Chemically Aggressive Media

Selyaev¹,

Selyaev²

2022

J Chem & its Appli

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Structures made of composite materials with a complex structure during operation are subjected to the combined effects of mechanical loads and aggressive media, which initiate the accumulation of damage in the material. As a result, premature destruction of structures, buildings, structures are possible. To prevent emergencies, it is necessary to be able to assess the resource of structures at any time. The article analyzes the previously proposed methodology of mathematical modeling of degradation processes, calculation and prediction of durability, resource structures, based on the application of the fundamental laws of mechanics of deformable solids and physico-chemical kinetics. The mechanisms of degradation of composites, methods of experimental determination of the main degradation parameters, conditions for calculating the durability of two groups of limit states are considered.

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“…(5) (6) (7) where ε e , ε p , ε ep are relative elastic, plastic deformations of elastic consequences.…”

Section: Figure 2: Experimental Degradation Modelsmentioning

confidence: 99%

“…To date, this problem is nontrivial and has no analytical solution. The results of numerous studies confirm the complexity and nonlinearity of degradation processes, as a result of which the color, average density, structure, strength, chemical and elemental compositions of the material change [2][3][4][5][6][7][8][9][10][11][12][13].…”

mentioning

confidence: 95%

Forecasting the Durability of Composite Materials Products under the Combined Action of Mechanical Loads and Chemically Aggressive Media

Selyaev¹,

Selyaev²

2022

J Chem & its Appli

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“…An RCON instrument [33] was used to determine the bulk according to ASTM C1760-12 [34] Figure 2 shows one of the samples tested by the instrument. From the measured values of bulk resistance, the diffusion coefficients were obtained based on Equation (1). The results of diffusion coefficients at 461 days after concreting (3 August 2020) for all studied groups are shown in Figure 3.…”

Section: Bulk Resistivity and Diffusion Coefficientsmentioning

confidence: 99%

“…Currently, for predicting or designing the service life of reinforced concrete structures, one dominant deteriorating mechanism (carbonation, chloride penetration, etc.) is used, while the structures are always exposed to a complex simultaneous action of mechanical and environmental loads [1][2][3]. Therefore, if the combination of two or more loads occurs simultaneously or consecutively, the service life prediction determined for only one load is not realistic, and it is overestimated.…”

Section: Introductionmentioning

confidence: 99%

Effect of Amount of Fibre and Damage Level on Service Life of SFR Recycled Concrete in Aggressive Environment

Lehner

Horňáková

2021

Buildings

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The paper presents a numerical calculation of the service life of concrete structures considering the effect of chlorides in the case of the material properties of structural lightweight waste aggregate concrete. Different amounts of fibres (0.0%, 1.0%, and 1.5%) and different values of compressive preloading (0%, 50%, and 100% of the ultimate strength capacity-USC) were considered. The subject of the research was the comparison of the influence of the constant diffusion coefficient and the time-dependent diffusion coefficient regarding the service life of the selected structure. Nine groups of material characteristics in combination with two numerical models are compared. A time-dependent diffusion coefficient and maturation coefficient, which were determined based on long-term monitoring (up to 461 days), were accepted for the numerical modelling. Thanks to time-dependent parameters, it is possible to observe the results of the theoretical service life of the structure and the influence of the mentioned factors. The analysed structure can be considered as the upper layer of an industrial floor in a chemical plant. It is important to determine the theoretical service life at which the structure shall be inspected or replaced. The results, in general, show that a higher amount of fibres reduces the service life as well as the preloading of the structure. An exception was a mixture with 1% of fibre loaded to 50% USC, which shows a lower diffusion coefficient than the specimens without preloading.

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“…Possible load combinations Most reinforced concrete structures are load bearing and some may be exposed to marine environment, harsh climate, sulfate or ammonia containing ground water, or air with high CO 2 content. Different mechanical loads and deterioration processes, which may act on concrete alone or in combinations, are listed in Table 1 according to Wittmann et al [9]. The table is by no means comprehensive but clearly shows that reinforced concrete structures in practice may be exposed in addition to a complex mechanical state of stress to a number of chemical reactions such as carbonation, chloride penetration, or alkali-silica reaction.…”

Section: Introductionmentioning

confidence: 99%

Durability of concrete under combined mechanical load and environmental actions: a review

Yao

Wang

2012

Journal of Sustainable Cement-Based Materials

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For a long time, research on durability was focused on one dominating deteriorating process. As a consequence, first attempts to develop a method for service life design for reinforced concrete structures were based on the assumption of one dominant deterioration process, such as carbonation, chloride penetration, or frost action, acting alone. Although this was a decisive step in the direction of more durable and more ecological construction, it was soon recognized that combinations of different deterioration processes may be much more severe than processes acting separately. This means that service life is underestimated in many practical applications if only one action is taken into consideration. In fact, synergetic effects of simultaneously or consecutively acting mechanical loads and environmental actions cannot be neglected. Compression, tension, and bending are frequently encountered mechanical loads, while chloride penetration, sulfate attack, carbonation, and leaching are widely known chemical actions and frost damage is the most important physical action. Due to the fact that there exist a multitude of possible load combinations, no wide database with reliable experimental results are available so far. Major publications on this topic will be published in an annotated bibliography in the near future. An overview on different test methods to study the influence of combined actions on durability is given in this paper. It is suggested that the validity of new test methods should be examined by comparative test series. Results of laboratory tests are to be compared with the performance of reinforced concrete structures in the field in aggressive environment.

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Influence of Combined Actions on Durability and Service Life of Reinforced Concrete Structures Exposed to Aggressive Environment

Cited by 17 publications

References 1 publication

Forecasting the Durability of Composite Materials Products under the Combined Action of Mechanical Loads and Chemically Aggressive Media

Forecasting the Durability of Composite Materials Products under the Combined Action of Mechanical Loads and Chemically Aggressive Media

Effect of Amount of Fibre and Damage Level on Service Life of SFR Recycled Concrete in Aggressive Environment

Durability of concrete under combined mechanical load and environmental actions: a review

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