Creep, chloride, carbonation and sulphate attack on concrete

Deterioration of concrete structures with age and environmental factors like creep, chloride, carbonation and sulphate attack in the presence of a corrosive environment leads to a decrease in their performance in terms of load-bearing capacity and serviceability. The present work attempts to develop...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2022-03, Vol.982 (1), p.12002
Main Authors: Murali Krishna, B., Sai Asrith, P., Tezeswi, T.P.
Format: Article
Language:English
Subjects:
Bearing capacity
Carbonation
Chloride
Chloride attack
Chlorides
Concrete
Concrete deterioration
Concrete properties
Concrete structures
Creep
Deterioration
Environmental factors
Mathematical models
Mechanical properties
Modulus of elasticity
Numerical models
Reinforced concrete
Sulfates
Sulphate attack
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Summary:Deterioration of concrete structures with age and environmental factors like creep, chloride, carbonation and sulphate attack in the presence of a corrosive environment leads to a decrease in their performance in terms of load-bearing capacity and serviceability. The present work attempts to develop a model for the impairment in the strength of RC beams because of the combined effects of creep and sulphate attack. It also aims at studying the individual effects of chloride carbonation attacks with the help of established deterioration models. The equations of instantaneous elastic modulus and long term creep described in Indian standard codes (IRC 112) enable modelling the deterioration of modulus of elasticity of concrete as a function of time. The influence of sulphate attack on concrete strength against time is obtained from an empirical research study. Standard numerical models are employed to understand the effects of chloride ingress and carbonation phenomena. The consequences of the aforementioned attacks on an M30 grade concrete girder beam are presented in this paper. The results showed that the creep and sulphate attacks tend to dwindle over the course of time, while the effect of the former is more dominant than that of the latter. In addition, the initiation times for carbonation and chloride attacks were estimated, and it was observed that for a pristine RC beam chloride attack is highly imminent than carbonation.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/982/1/012002