Abstract：Hydraulic structures in cold regions subject to abrasion and freeze-thaw effect in the long term. Under the coupling freeze-thaw effect, the mechanical properties and durability of concrete may experience a greater degradation. In this work, the anti-abrasion capacity of concrete under freeze-thaw cycle is investigated, and the abrasion-induced damage law of concrete under freeze-thaw cycle was studied on the basis of the experimental data and theoretical analysis. The main research work is summarized as: (1) A new abrasion test method for concrete was designed. With the factors of air-entraining agent and freeze-thaw cycles considered, the freeze-thaw tests of 48 specimens were conducted, and the change laws of dynamic elastic modulus, relative mass and compressive strength of concrete under freeze-thaw cycles were attained. The experimental results show that under the coupling action of freeze-thaw cycle and abrasion, the durability degradation of concrete is 2 or 3 times more serious than that under the single action. (2) Based on the freeze-thaw damage model and the abrasion test, the theoretical attrition rate model of freeze-thaw concrete under the abrasion action was established, and a good agreement between the calculated results and the experimental results could be achieved. (3) A finite element model was established based on the theoretical model, and then it was used for the analysis of a concrete pier located at the north part of China. It was found that the annual abrasion depth was calculated to be 4.7-5.7mm under the coupling effect of abrasion and freeze-thaw cycle. The more rapid the stream is, the more serious the abrasion of concrete is.
刘明辉 韩 冰 马金泉. 冻融循环作用下混凝土抗冲磨性能研究#br#[J]. 土木工程学报, 2019, 52(7): 100-109.
Liu Minghui Han Bing Ma Jinquan. Research on the anti-abrasion capacity of concrete under freeze-thaw cycle. 土木工程学报, 2019, 52(7): 100-109.
