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In recent years, nondestructive testing, especially ultrasound testing method, has been increasingly used to detect concrete strength, compactness, cracks, and other aspects. In this work, the damage layer, thickness measured by ultrasound plane testing method and the formation mechanism of the damage layer were studied. Simultaneously, the damage process and microstructure of shotcrete under multiple...
The paper, on the basis of the girder bridge in service as research object, puts forward the assessment methods of anti-seismic reliability degree in service structure. Firstly, the aging and damage factors of materials having happened in girder bridge in service is analyzed. Secondly, considering when the subsequent use of the bridge structure in service within the probability that can suffer seismic...
There are a great number of concrete structures existing in the atmospheric environment. The process of industrialization has led to the severe air pollution. The density of CO2 increases so severely that the carbonization of concrete is increasingly concerned about. CO2 is the most ordinary acidic material in the atmospheric environment. In this paper, the carbonization process of CO2 was analyzed...
Based on fly ash concrete carbonation test, the impacts of water-binder ratio, fly ash proportion and pouring side to concrete carbonation depths was studied. With the help of the influence coefficient Ks of steel bar existence, the carbonation situations of concrete specimen with steel bar existence are analysed. The research results indicate that steel bar existence can inhibit concrete carbonation...
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