Experimental Study on Time-varying Characteristics of High-performance Concrete in Marine Environment in Cold Regions

Aiming at the time-varying c:harac:teristit: evolution law of high-performance concrete (HPC) in the marine environment in cold regions, based on the No. 2 Bridge of Nachao River in Caofeidian District, Tangshan City, Hebei Province, an experimental investigation was carried out on the time-varying performance of HPC under the same bridge location and factors. The actual measured value of the specimen was compared with the predicted value of specifications and standards. The results show that: The increase of early compressive strength of HPC under the marine environment in cold regions is significantly higher than the predicted value of the specifications, and the compressive strength shows a trend of rapid development in the early stage and slow development in the later stage; the early progress of HPC elastic modulus in the marine environment of cold regions is fast, hut the initial progress is relatively lagging behind the development trend of compressive strength. The elastic modulus of HPC calculated by compressive strength is obviously smaller than the actual measured value; the shrinkage strain of HPC in the marine environment in cold regions also has a fast convergence rate in the initial stage and a slower convergence rate in the later stage. In addition, the size of the specimen member is not only related to the final value of the shrinkage strain, but also affects the development process of the shrinkage strain with time; aiming at the shrinkage and creep development characteristics of HPC in the marine environment in cold regions, according to the test results, the shrinkage parameter correction model based on CKU-PIP—2010 and the creep prediction correction formula based on EN 1992-2—2005 are respectively proposed. © 2024 Science Press. All rights reserved.