Conformity control of concrete durability parameters and its filtering effect on the design service life

2021 ◽  
Author(s):  
Eline Vereecken ◽  
Robby Caspeele
Keyword(s):  
Service Life ◽  
Concrete Durability ◽  
Design Service Life ◽  
Filtering Effect

The Reinforced Concrete Durability and Rebar Erosion Monitoring

2012 ◽  
Vol 446-449 ◽  
pp. 3252-3258
Author(s):  
Jin Yang Zhang ◽  
De Mi Cui ◽  
Lie Min Lv ◽  
Zhi Yang
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Protective Layer ◽  
Concrete Surface ◽  
Monitor System ◽  
Concrete Durability ◽  
Information Feedback ◽  
Starting Time ◽  
Cast Concrete

On the basis of the advantages of low construction cost, remarkable dynamics property, easy cast moulding and more controllable construction, the reinforced concrete construct are widely applied in buildings and main structures of constructions in China. However, the reinforced concrete is found more or less aging after many years’ utilization and erosion from the environment, which will lead to a hidden risk to affect its functions. After technical development for decades, the concrete can assure its durability under normal situation, yet the function would be deteriorated due to the erosion from the complex and harsh environment to make it hardly reach its designed service life. With the assist of CorroWatch erosion monitor system, the concrete structures’ erosion can kept watched on to obtain the depassivation development and information feedback of some key data dynamically and in long term so as to foresee precisely the erosion starting time. The newly cast concrete depassivation frontline is located on concrete surface and will tend to go through the protective layer and penetrate towards rebar as time goes on. Its structure service life can be enhanced with the re-designed durability in terms of the mentioned characters and do well the erosion proof measures.

Influence of Frost Damage on Chloride Penetration into Concrete

2016 ◽  
Vol 711 ◽  
pp. 359-366
Author(s):  
Peng Zhang ◽  
Folker H. Wittmann ◽  
Yan Ru Wang ◽  
Tie Jun Zhao ◽  
Guan Ting
Keyword(s):  
Service Life ◽  
Frost Damage ◽  
Chloride Penetration ◽  
Capillary Absorption ◽  
Freeze Thaw ◽  
Durability Design ◽  
Design Service Life ◽  
Before And After ◽  
Deteriorating Process ◽  
Selection Of

In most national and international codes for durability design, service life is estimated after selection of one single and dominant deteriorating process such as carbonation, chloride penetration or frost attack. Application of existing codes has shown, however, that the predicted service life is not reached in practice in most cases. Early damage occurs and as a consequence expensive repair measures become frequently necessary, long before the design service life is reached. One reason for this discrepancy is certainly the fact that in practice each dominant deteriorating process is usually accompanied by other aggravating processes. In this contribution capillary absorption of different types of concrete is studied first. The influence of an increasing number of freeze-thaw cycles on capillary absorption of water is studied first, then chloride penetration before and after exposure to a certain number of freeze-thaw cycles was determined experimentally. It was found that an increasing number of freeze-thaw cycles increases chloride penetration significantly, and hence reduces service life in aggressive environment. It can be concluded that for realistic service life prediction the interaction between frost damage and chloride penetration has to be taken into consideration in regions with low temperatures.

Prediction of durability of structural concrete in aggressive exposures

2018 ◽  
Author(s):  
Сергей Леонович ◽  
Sergey Leonovich ◽  
Валентин Доркин ◽  
Valentin Dorkin ◽  
Оксана Чернякевич ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Building Materials ◽  
Limit State ◽  
Concrete Structures ◽  
Life Cycles ◽  
Reinforced Concrete Structures ◽  
Concrete Durability ◽  
Concrete Carbonation ◽  
Corrosion Of Steel

The monograph is devoted to the prediction of the longevity of reinforced concrete structures, the destruction of which is associated with corrosion of steel reinforcement caused by chloride aggression or concrete carbonation. On the basis of a comprehensive analysis of models for calculating the service life of structures and experimental data, preference is given to the mathematical model Dura Crete. Life cycles for the main degradation processes in concrete and reinforcement, periods of initiation and propagation of corrosion are considered. Particular attention is paid to the influence of environmental factors and the quality of concrete on the kinetics of chloride penetration and movement of the carbonization front. Formulated limit state design reinforced concrete durability in chloride attacks and carbonation. The basic provisions of the method of calculating the durability of reinforced concrete structures, based on the use of the reliability coefficient for the service life. The practical assessment of service life of reinforced concrete elements taking into account stochastic processes in concrete and reinforcement is made. Verification of the model reliability is performed. For all those interested in the issues of building materials and processes occurring in them.

scholarly journals Durability and service life prediction for concrete structures – developments and challenges

2018 ◽  
Vol 149 ◽  
pp. 01006 ◽  
Author(s):  
Mark G Alexander
Keyword(s):  
Service Life ◽  
Life Prediction ◽  
Concrete Structures ◽  
Performance Testing ◽  
Integrated Approach ◽  
Service Life Prediction ◽  
Site Quality ◽  
Concrete Durability ◽  
Durability Prediction ◽  
Service Life Modelling

The paper reviews developments in service life prediction for concrete structures. It indicates the difficulties inherent in rational service life design, in view of the multiple factors and variabilities involved in the process. The paper also emphasises the advantages of performance-based approaches to durability prediction, and considers performance testing, which is critical to achieving intended service life. Such approaches allow service life modelling, which the current prescriptive approaches do not. The concept of ‘durability indicators’ is covered, with a practical example showing how this can be used to improve concrete durability in construction. The paper also stresses the importance of an ‘integrated approach’ to durability specifications, performance-based predictions, and site quality control.

Analysis of Construction Project Basing on Concrete Durability

2014 ◽  
Vol 716-717 ◽  
pp. 435-438
Author(s):  
Kai Ke Sun ◽  
Yan Zheng ◽  
Ming Fei Li ◽  
Zhao Peng Yang ◽  
Shuai Guo
Keyword(s):  
Service Life ◽  
Economic Analysis ◽  
Objective Function ◽  
Construction Projects ◽  
Construction Project ◽  
Structural Performance ◽  
Concrete Durability ◽  
Reliability Design ◽  
Solid Foundation

In response to this phenomenon that many construction projects failed much earlier than their expected service life ,or failed to accomplish their expected functions caused by the reinforeed conerete structure are found to be suffering from deterioratioon of structural performance and degradation of safety,due to the deficiency of concrete durability. From the perspective of what effect of economic that has been taken by the concrete durability,so the method what would been used to analyze economic of construction project was proposed ,and the objective function of economic analysis of construction project was created based on the concrete durability,all of the above work will lay a solid foundation to study the reliability design of construction project and economic analysis.

Basics of Operation of GTE Disks by the Technical Condition: the Way to Extend Their Design Service Life

2016 ◽  
Vol 48 (3) ◽  
pp. 411-418
Author(s):  
V. V. Pokrovskii ◽  
V. G. Sidyachenko ◽  
V. N. Ezhov ◽  
S. B. Kulishov ◽  
A. N. Skritskii ◽  
...  
Keyword(s):  
Service Life ◽  
Technical Condition ◽  
Design Service Life ◽  
The Way

scholarly journals Justifying the prolongation of the service life of the bearing structure of a tank car when using Y25 bogies

2021 ◽  
Vol 3 (7 (111)) ◽  
pp. 6-14
Author(s):  
Oleksij Fomin ◽  
Alyona Lovska ◽  
Kseniia Ivanchenko ◽  
Ievgen Medvediev
Keyword(s):  
Service Life ◽  
Software Package ◽  
Equations Of Motion ◽  
Simulation Software ◽  
Load Bearing ◽  
Runge Kutta Method ◽  
Design Service Life ◽  
Reported Study ◽  
Mathcad Software ◽  
Bearing Structure

This paper substantiates the use of Y25 bogies under tank cars in order to prolong their service life. The reported study has been carried out for a tank car with rated parameters, as well as the actual ones, registered during full-scale research. Mathematical modeling was performed to determine the basic indicators of the tank car dynamics. The differential equations of motion were solved by a Runge-Kutta method using the Mathcad software package (USA). It was established that the use of Y25 bogies under a tank car with rated parameters could reduce the acceleration of its bearing structure by almost 39 % compared to the use of standard 18‒100 bogies. Applying the Y25 bogies under a tank car with the actual parameters reduces the acceleration of its load-bearing structure by almost 50 % compared to the use of standard 18‒100 bogies. The derived acceleration values were taken into consideration when calculating the bearing structure of a tank car for strength. The calculation was performed using the SolidWorks Simulation software package (France). The resulting stress values are 18 % lower than the stresses acting on the load-bearing structure of a tank car equipped with 18‒100 bogies. For the load-bearing structure of a tank car with the actual parameters, the maximum equivalent stresses are 16 % lower than the stresses when the 18‒100 bogies are used. The design service life of the load-bearing structure of a tank car was estimated taking into consideration the use of Y25 bogies. The calculations showed that the design service life of the bearing structure of a tank car equipped with Y25 bogies is more than twice as high as that obtained for 18‒100 bogies. The study reported here would contribute to compiling recommendations for prolonging the service life of the load-bearing structures of tank cars

Design Service Life Determination for Bridge Structural Elements

2009 ◽  
Vol 96 (20) ◽  
pp. 63-70
Author(s):  
Yuqian Wang ◽  
Xin Ruan ◽  
Airong Chen ◽  
Haijun Wu ◽  
Tobia Zordan
Keyword(s):  
Service Life ◽  
Structural Elements ◽  
Design Service Life

Applying Digital Technologies Beyond Design Life

2021 ◽  
Author(s):  
Luiz Paulo Feijo ◽  
Suqin Wang ◽  
Christiane Machado
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Digital Technology ◽  
Predictive Analytics ◽  
Life Extension ◽  
Structural Behaviour ◽  
Structural Evaluation ◽  
Design Service Life ◽  
Remaining Fatigue Life ◽  
Extension Process

Abstract This paper focuses on Floating Production Installations, which are assets designed based on site-specific environmental conditions to determine their design service life. The longevity of these assets depends on the fatigue aspects related to the structural elements and mooring systems. Among the challenges involving the continued services of ageing assets is the integrity of these elements. When an asset reaches its end of design service life, Operators often decide to undergo a life extension process for safe continued operations. Alife extension process generally includes three phases: investigation, determination and implementation. Following a baseline inspection to determine the present conditions of the structures, engineering assessments are to be carried out to evaluate the fatigue damage through the lifecycle of the installation and therefore determine the remaining fatigue life. Collecting information to execute these assessments is challenging and can be automated with the use of digital technology. Digital tools allow an accurate collection of data, providing a continuous evaluation of the remaining fatigue life and supporting an informed decision-making process. Observing the operation of several aging assets and their structural behaviour, the parameters to be measured during the installation's lifecycle have been identified along with other aspects that also contribute to the determination of its continued service. The recommended data acquisition for relevant measurements is summarized in this paper. The application of sensors and monitoring systems on the installations allows measuring these parameters on a continuous basis, and consequently, Operators are able to determine the degradation pattern that the structure is subject to. An estimation of the remaining fatigue life can be achieved by using predictive analysis, which, along with insights of the future expected corrosion, provides Operators the necessary basis to implement corrective measures and mitigations to avoid the occurrence of a failure. This paper offers an innovative, forward-looking technology that allies physics-based processes with digital technology, supported by predictive analytics and continuous structural evaluation, to assess the integrity of an offshore asset in support of safe continued services.

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