Corrosion of anchorage head system of post-tensioned prestressed concrete structures under chloride environment

2017 ◽  
Vol 18 (6) ◽  
pp. 902-913 ◽  
Author(s):  
Fumin Li ◽  
Xiaoya Luo ◽  
Zhenguo Liu
Keyword(s):  
Prestressed Concrete ◽  
Concrete Structures ◽  
Chloride Environment ◽  
Post Tensioned

Inspection of Grouting Quality for Grouted Tendon Ducts Using Ground Penetrating Radar Technique

2013 ◽  
Vol 639-640 ◽  
pp. 1051-1055 ◽  
Author(s):  
Xian Yan Zhou ◽  
Jian Luan ◽  
Da Hai Zhang
Keyword(s):  
Nondestructive Testing ◽  
Ground Penetrating Radar ◽  
Prestressed Concrete ◽  
Concrete Structures ◽  
Optimal Methods ◽  
Ground Penetrating ◽  
Radar Technique ◽  
Post Tensioned

With the wide applications of post-tensioned concrete structures, the grouting conditions of tendon ducts are paid more attentions. In order to accurately assess the internal grouting quality of the grouted tendon ducts and certainly guarantee the lifetime of prestressed concrete structures Ground Penetrating Radar (GPR), which is a kind of nondestructive testing (NDT) method, has been applied to inspect and evaluate qualitatively and quantitatively on the grouting defects, respectively. A series of in-house tests were carried out for simulating the defects of tendon ducts by foams with different sizes. The results show that the GPR technic was one of the optimal methods for inspecting the internal grouting quality of grouted tendon ducts for post-tensioned concrete structures.

Probabilistic Lifetime Assessment of Prestressed Concrete Structures Exposed to Chloride Environment

2013 ◽  
Vol 378 ◽  
pp. 135-139
Author(s):  
Chun Hua Lu ◽  
Hui Li
Keyword(s):  
Prestressed Concrete ◽  
Prediction Models ◽  
Limit State ◽  
Concrete Structures ◽  
Hangzhou Bay ◽  
Chloride Ingress ◽  
Prestressing Steel ◽  
Corrosion Initiation ◽  
Definition Of ◽  
Chloride Environment

In order to study the durability behavior of marine prestressed concrete structures exposed to chloride environment, the structural service life is defined as the corrosion initiation of prestressing steel bars. For the chloride ingress in prestressed concrete, a calculated model used to predict the lifetime is developed. Based on the definition of durability limit state, a probabilistic lifetime model and its time-dependent reliability analytical method are proposed by considering the random natures of influencing factors. Then, the probabilistic lifetime prediction models are applied to a PC bridge located in Hangzhou Bay with Monte Carlo simulation. It is found that the time to corrosion initiationt0follows a lognormal distribution. With the permitted failure probability of 5.0%, it is also observed that the structural durability lifetimes are 25.6, 107.4 and 224.2 years forc=40mm,c=60mm andc=80mm, respectively.

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