scholarly journals Upgrading of normal concrete service life by using SIFCON layers

2020 ◽  
Vol 737 ◽  
pp. 012045
Author(s):  
Dalya H. Hameed ◽  
Shakir A. Salih ◽  
Galib M. Habeeb
Keyword(s):  
Service Life ◽  
Normal Concrete ◽  
Concrete Service

A new handbook on structural concrete service life assignment taking into account the operating environment impact in their life cycle

2020 ◽  
pp. 126-134
Author(s):  
Vyacheslav Falikman ◽  
◽  
Valentina Stepanova ◽  
Keyword(s):  
Life Cycle ◽  
Service Life ◽  
Operating Environment ◽  
Environment Impact ◽  
Structural Concrete ◽  
Concrete Service

В статье систематизированы основные критерии, необходимые для определения нормативных сроков эксплуатации бетонных и железобетонных конструкций, проведен анализ состояния отечественной и зарубежной нормативной базы в отношении требований к срокам службы железобетонных конструкций, рассмотрены основные нормативно-технические документы в области проектирования железобетонных конструкций зданий и сооружений по их жизнен-ному циклу. Описаны виды коррозионных повреждений железобетонных конструкций и определяющие их факторы, приведены согласованные на международном уровне модели долговечности для некоторых деградационных процессов. На основе проведенных работ подготовлены предложения по оценке коррозионного состояния эксплуатировавшихся железобетонных конструкций, их остаточной несущей способности, эксплуатационной пригодности, ожидаемого срока службы в заданных агрессивных условиях и методов определения нормативных сроков службы железобетонных конструкций. Даны предложения по разработке и актуализации ряда релевантных нормативных, технических и организационно-методических документов.

Computer-aided modeling of concrete service life

2014 ◽  
Vol 47 ◽  
pp. 9-18 ◽  
Author(s):  
Sotiris Demis ◽  
Maria P. Efstathiou ◽  
Vagelis G. Papadakis
Keyword(s):  
Service Life ◽  
Computer Aided ◽  
Concrete Service

Carbonation of Surface Protected Concrete with Silicone Material

2014 ◽  
Vol 584-586 ◽  
pp. 883-886
Author(s):  
Hong Song Wang ◽  
Wei Wang ◽  
Rui Wang ◽  
Wen Bin Wang ◽  
Lei Li ◽  
...  
Keyword(s):  
Service Life ◽  
Surface Treatment ◽  
Steel Reinforcement ◽  
Rapid Decay ◽  
Carbonation Depth ◽  
Surface Protection ◽  
Maintenance And Repair ◽  
Repair Costs ◽  
Harmful Substances ◽  
Concrete Service

Concrete structures are exposed to carbonation that may cause rapid decay, shortening their service life and raising maintenance and repair costs. Carbonation lowers the alkalinity of the concrete depassivating the steel reinforcement. The prescriptive methodology is not a guarantee to obtain the desired service lives of 50 or 100 years. Surface treatment is commonly used to improve the resistance of concrete to carbonation. Using the silicone materials to an immersion treatment can effectively block the invasion of harmful substances,the carbonation of concretes with surface protection with silicone materials was evaluated. The results showed silicone can lower carbonation depth than the non-protected concretes. The carbonation depth will not increase significantly in the latter part of the concrete service.

Prediction of concrete service-life

1985 ◽  
Vol 18 (1) ◽  
pp. 21-30 ◽  
Author(s):  
J. Pommersheim ◽  
J. Clifton
Keyword(s):  
Service Life ◽  
Concrete Service

Effect of coupled deterioration by freeze–thaw, carbonation and chlorides on concrete service life

2014 ◽  
Vol 47 ◽  
pp. 32-40 ◽  
Author(s):  
H. Kuosa ◽  
R.M. Ferreira ◽  
E. Holt ◽  
M. Leivo ◽  
E. Vesikari
Keyword(s):  
Service Life ◽  
Freeze Thaw ◽  
Concrete Service

Concrete Bridge Service Life Extension Using Sealers in Chloride-Laden Environments

1996 ◽  
Vol 1561 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Jerzy Żemajtis ◽  
Richard E. Weyers
Keyword(s):  
United States ◽  
Service Life ◽  
The United States ◽  
Life Extension ◽  
Concrete Bridge ◽  
Public Funds ◽  
Water Based ◽  
Service Life Extension ◽  
Concrete Service ◽  
Diffusion Properties

The early deterioration of concrete structures in chloride-laden environments is well known. The severity of the deterioration of bridges in the United States has resulted in the development of a large number of corrosion protection and rehabilitation methods for service life extension. For bridge engineers to make best use of public funds, service life, service life extension, and method application costs are needed. A methodology based on diffusion properties is presented for determining the service life (reapplication period) and service life extension of concrete bridge surface treatments and sealers. Consideration is given to traffic wear, degradation by ultraviolet light, and the ability of sealers to reduce the rate of ingress of chlorides into the concrete. Service life extension periods are presented for four sealers: solvent and water-based epoxies, silane, and siloxane. Service life extension periods consider the severity of the environment and the bridge member exposure conditions.

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