Experimental and numerical investigation on the deterioration mechanism for grouted rock bolts subjected to freeze–thaw cycles

2021 ◽  
Author(s):  
Jinke Yuan ◽  
Changwen Ye ◽  
Jinfei Yang ◽  
Zhenbin Xie ◽  
Jiancheng Liu ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Rock Bolts ◽  
Freeze Thaw ◽  
Deterioration Mechanism ◽  
Grouted Rock Bolts

scholarly journals Research on Deterioration Mechanism of Concrete Materials in an Actual Structure

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Shiping Zhang ◽  
Xiang Dong ◽  
Houxian Zhang ◽  
Min Deng
Keyword(s):  
Concrete Structure ◽  
Frost Resistance ◽  
Field Survey ◽  
Petrographic Analysis ◽  
Actual Structure ◽  
Freeze Thaw ◽  
Alkali Aggregate Reaction ◽  
Deterioration Mechanism ◽  
Concrete Materials

The cause for deterioration of the concrete structure located in severe environment has been explored both in field and in laboratory. Serious cracking and spalling appeared upon surface of the concrete structure soon after the structure was put into service. Both alkali-aggregate reaction and freeze-thaw cycles may result in similar macro visible cracking and spalling. The possibility of alkali-aggregate reaction was excluded by both field survey and lab examination such as chemical analysis, petrographic analysis, and determination of alkali reactivity of aggregates. According to results of freeze-thaw cycles, impermeability testing, and microstructure analysis, it is deduced that the severe environmental conditions plus the relatively inferior frost resistance cause the deterioration of concrete. Usage of air entraining admixture can improve frost resistance and impermeability. Furthermore, new approaches to mitigate the deterioration of concrete used in severe environmental condition are discussed.

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