单面冻融下不同再生骨料取代率的混凝土性能劣化研究

Study on Performance Degradation of Concrete with Different Recycled Aggregate Replacement Rates under Single-Side Freeze-Thaw

为了研究再生混凝土在单面冻融环境下的抗冻性劣化,本文对不同再生骨料取代率的混凝土进行单面冻融试验,分析了不同再生骨料取代率混凝土在单面冻融环境下的相对动弹性模量与抗压强度损失。结果表明,随着单面冻融次数的增加,再生混凝土的相对动弹性模量下降,单面冻融环境下损伤程度最严重的为100%再生骨料掺量的混凝土。同时,建立不同再生骨料取代率混凝土的单面冻融损伤劣化模型。试验数据拟合表明,自然衰变损伤模型的拟合精度高,引入再生骨料掺量系数可以表征不同再生骨料取代率混凝土的损伤劣化规律。

In order to study the deterioration of the frost resistance of recycled concrete in the single-side freeze-thaw environment,the single-side freeze-thaw test is carried out on concrete with different replacement rates of recycled aggregate,and the relative dynamic elastic modulus and compressive strength loss of concrete with different recycled aggregate replacement rates under the single-side freeze-thaw environment are analyzed in this paper.The results show that the relative dynamic elastic modulus of recycled concrete decreases with the increase of the number of freeze-thaw cycles on one side,and the most serious damage in the single-side freeze-thaw environment is the concrete with 100%recycled aggregate content.At the same time,a single-side freeze-thaw damage deterioration model of concrete with different recycled aggregate replacement rates is established.The fitting of experimental data shows that the natural decay damage model has high fitting accuracy,and the introduction of recycled aggregate content coefficient can characterize the damage and deterioration law of concrete with different recycled aggregate replacement rates.