摘要
Abstract
In order to study the influence of sulfate attack environment on the performance of recycled concrete,four groups of recycled concrete specimens with different content of recycled coarse aggregate were prepared,and the specimens were subjected to 15,30,60,90 and 120 dry and wet cycle tests in sulfate solution,respectively,and compared with those without corrosion.The deterioration law of recycled concrete under dry and wet cycle is studied systematically.The test results show that the compressive strength and dynamic elastic modulus of recycled concrete increase first and then decrease under the action of dry and wet cycling.At the stage of 0～30 cycles,the mechanical properties of all dosage groups were improved,and the 30%recycled coarse aggregate dosage group showed the best performance with compressive strength of 59.96 MPa and dynamic elastic modulus of 51.3 GPa.When the number of cycles increased to 60～120 times,the performance of all groups deteriorated,and the deterioration was most significant in the 70%dosage group,and the dynamic elastic modulus decreased to 25.5 GPa.The 30%addition group showed the best durability,and its final mass loss rate was only 1.418%,which was better than the benchmark group.关键词
再生混凝土/硫酸盐侵蚀/干湿循环/再生粗骨料Key words
Recycled concrete/Sulfate attack/Dry and wet cycle/Recycled coarse aggregate分类
建筑与水利
