Service life prediction of self compacted concretes with respect to chloride ion penetration

2021 ◽  
Author(s):  
C. Rajamallu ◽  
T. Chandrasekhar Reddy ◽  
E. Arunakanthi
Keyword(s):  
Service Life ◽  
Life Prediction ◽  
Chloride Ion ◽  
Service Life Prediction ◽  
Chloride Ion Penetration ◽  
Ion Penetration

Service Life Prediction of Reactive Powder Concrete due to Seawater Infiltration

2012 ◽  
Vol 535-537 ◽  
pp. 1785-1789
Author(s):  
Xin Wei Ma ◽  
Yu Yan Ji
Keyword(s):  
Service Life ◽  
Life Prediction ◽  
Sea Water ◽  
Energy Dispersive Spectrometer ◽  
Chloride Ion ◽  
Service Life Prediction ◽  
Reactive Powder Concrete ◽  
Ion Diffusion ◽  
Marine Engineering ◽  
Reactive Powder

Reactive powder concrete (RPC) has a higher strengths, as well as excellent durability and corrosion resistance. So, it is expected to be increasingly used in marine engineering. In this study, After the RPC samples had been subjected to gradually increased high-pressure seawater for 30 days, the chloride contents in the samples along with the infiltration direction were calibrated on an energy dispersive spectrometer. On the basis of second Fick’s law, the chloride ion diffusion model and service life prediction model of reactive powder concrete in sea water are established. The service life of an actual reactive powder concrete structure could be predicted.

Test Research of Chloride Ion Penetration in Concrete Tunnel Lining Structure

2012 ◽  
Vol 446-449 ◽  
pp. 3155-3159
Author(s):  
Zhong Li ◽  
Yan Peng Zhu ◽  
Xiao Yan Cui
Keyword(s):  
Service Life ◽  
Penetration Depth ◽  
Chloride Ion ◽  
Chloride Content ◽  
Chloride Ions ◽  
Tunnel Lining ◽  
Chloride Ion Penetration ◽  
Lining Structure ◽  
Erosion Environment ◽  
Ion Penetration

Chloride ion diffusion coefficient is an important indicator reflected the concrete durability in chloride erosion environment, and affects the service life of concrete structure directly. By the indoor test of chloride acceleration permeability, the chloride ions diffusivity is studied in the tunnel lining structure, and the variation law of the chloride content is tested with the change of penetration depth of different age specimen. Tests shows, with the increases of the penetration depth, the chloride content decrease gradually and finally tend to the initial chloride content of the specimen. Penetration time has a strong cumulative effect on the internal concentration of chloride ions in concrete, the high or low level of chloride ion concentration have a role of promotion or reduction for the chloride ion penetration in the concrete inside. The results provide an important basis for the predictions of service life of tunnel lining in chloride erosion environment.

Diffusivity Resistance of Concrete Systems in Chloride Rich Environment for Corrosion Protection of Embedded Steel Bars

2013 ◽  
Vol 831 ◽  
pp. 3-8
Author(s):  
Suad Khalid Al-Bahar ◽  
Safaa M. Abdul Salam ◽  
Adel M. Husain
Keyword(s):  
Service Life ◽  
Concrete Structures ◽  
Chloride Ion ◽  
Chloride Ions ◽  
Steel Reinforcement ◽  
Mineral Admixtures ◽  
Chloride Ingress ◽  
Corrosion Initiation ◽  
Chloride Ion Penetration ◽  
Ion Penetration

Improving concrete performance and minimizing corrosion-induced deterioration of reinforced concrete structures are mandated Building Codes Practices and Specifications in arid regions such as the Arabian Gulf. Concrete structures resist corrosion due to the passivating properties of the hydrated cement around the steel reinforcement created by the high alkaline environment within the composite structure (pH > 12). However, the presence of chloride ions in the pore structure of the concrete destroys this passivating layer, which makes the steel reinforcement vulnerable to chloride-induced corrosion attack that accelerates degradation and deterioration of concrete structures. Corrosion activities-related tests such as Time-to-Corrosion Initiation (Modified ASTM G-109)6, and Corrosion Rate Test (Lollipop Test), can be effectively used to monitor the behavior of corrosion development, while chloride ingress characteristics tests such as Electrical Indication of Concretes Ability to Resist Chloride Ion Penetration ASTM C-1202-91)7, and the Resistance of Concrete to Chloride Ion Penetration (AASHTO T 259-80)8, are applied to evaluate the rate at which chloride ions can diffuse through concrete to onset the time-to-corrosion initiation, which will impact the structure service life and compromise its sustainability. Efforts have been made by scientists to develop mathematical simulation models that predict the service life of the structure based on Ficks Second Law for semi-finite diffusion of chloride ions, concentrated at different concrete depths. The study concluded that mineral admixtures have contributed to the enhancement of concrete performance and its resistance to chloride diffusivity, as well when in combination with corrosion-inhibiting admixture such as calcium nitrite.

scholarly journals Service Life Prediction of RC Structure Incorporated with GGBS Subjected to Chloride Ion Penetration

2021 ◽  
Vol 1197 (1) ◽  
pp. 012066
Author(s):  
P Rajesh ◽  
M Sateesh Babu ◽  
I Siva Kishore
Keyword(s):  
Service Life ◽  
Life Cycle Cost ◽  
Life Prediction ◽  
Construction Material ◽  
Chloride Ion ◽  
Chloride Content ◽  
Immersion Test ◽  
Service Life Prediction ◽  
Reinforced Concrete Structure ◽  
Binder Ratio

Abstract Durability plays important role in structures that replicates the service life of the structure. Most of the structures are built by using concrete as main construction material. We can improve the service life of structures by substituting cement with secondary materials which contain cementitious property such asGGBS (Ground Granulated Blast Furnace Slag). In this concept we determine the chloride content in reinforced concrete structure which leads to deterioration, when exposed to 3.5% of NaCl solution by using immersion test. Firstly, we cast cubes (150x150x150mm) for conventional mix and mixes with different percentages of GGBS (30%, 50% and70%). Present in this paper we considered 0.30, 0.40 and 0.50 water binder ratio (w/b). Later on, we find the percentage of chloride ion penetrated is tested at 6 weeks and 12 weeks. We determine the compressive strength for 28 days, 56 days and 90 days and the chloride content (%) at 5mm, 10mm, 15mm, 20mm and 25mm depths of specimens, by using an empirical formula of Fick’s 2nd law. Service life prediction can be helpful to estimate prevailing the life of structure and can plan the better repair strategies and to make critical decisions in practice. We can design new structures such that life cycle cost can be optimized.

scholarly journals Critical Review of Polymeric Building Envelope Materials: Degradation, Durability and Service Life Prediction

Buildings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 299
Author(s):  
Marzieh Riahinezhad ◽  
Madeleine Hallman ◽  
J-F. Masson
Keyword(s):  
Climate Change ◽  
Service Life ◽  
Critical Review ◽  
Life Prediction ◽  
Building Envelope ◽  
Service Life Prediction ◽  
Degradation Mechanisms ◽  
Material Component ◽  
Aging Conditions ◽  
Environmentally Sound

This paper provides a critical review of the degradation, durability and service life prediction (SLP) of polymeric building envelope materials (BEMs), namely, claddings, air/vapour barriers, insulations, sealants, gaskets and fenestration. The rate of material deterioration and properties determine the usefulness of a product; therefore, knowledge of the significant degradation mechanisms in play for BEMs is key to the design of proper SLP methods. SLP seeks to estimate the life expectancy of a material/component exposed to in-service conditions. This topic is especially important with respect to the potential impacts of climate change. The surrounding environment of a building dictates the degradation mechanisms in play, and as climate change progresses, material aging conditions become more unpredictable. This can result in unexpected changes and/or damages to BEMs, and shorter than expected SL. The development of more comprehensive SLP methods is economically and environmentally sound, and it will provide more confidence, comfort and safety to all building users. The goal of this paper is to review the existing literature in order to identify the knowledge gaps and provide suggestions to address these gaps in light of the rapidly evolving climate.

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