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| Mesocosm study on characteristic of autogenous shrinkage for concrete based on hydration degree |
| 1.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2.City Institute, Shanghai Municipal Engineering Design General Institute, Shanghai 200092, China) |
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Abstract The simulation of temperature, humidity and stress fields based on the equivalent age method and the fully automatic modeling tool of aggregates was carried out. The influence of two factors, temperature history and autogenous relative humidity due to selfdesiccation, on autogenous shrinkage in concrete was studied from the mesocosmic view. It is concluded that the aggregate and matrix show distinct distribution properties in humidity field and stress field, the aggregatematrix interface has high possibility to become the location of the initial cracking caused by AS, the temperature history is the main factor affecting the autogenous shrinkage, and the distribution of random aggregates is extremely important for mesoscopical analysis. It is beneficial for better estimating cracking risk and preventing cracking development through establishing whole evaluation model fitting to microresults. In a word, the inherent mechanism and cracking mechanism of autogenous shrinkage can be explained more reasonably by using above mesoscopic model and calculation method.
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2010, Vol. 31 
