SULFATE ATTACK IN CONCRETES EXPOSED TO COMBINED ACTION OF FLEXURAL LOAD AND DRY-WET CYCLING
Degradation of fly ash concrete (FAC), high performance concrete (HPC), and green high durable concrete (GHDC) subjected to combined action of flexural load, dry-wet cycling and sulfate attack is investigated. The sulfate used was 5％ magnesium sulfate solution. Results show that dry-wet cycling accelerates the sulfate corrosion of concrete. The flexural load defers the corrosion in early stage, yet it accelerates the corrosion in the later stage of the process. And a superposition effect of dry-wet cycling and flexural load on the sulfate corrosion of concrete can be observed. In the initial corrosion stage, the degradation of concretes under multifactors (dry-wet cycling + magnesium sulfate + flexural load) is slower than that under doublefactors (dry-wet cycling + magnesium sulfate), however with the erosion process proceeds, the deterioration of concretes under multi-factors is worse than that under double-factors (dry-wet cycling + magnesium sulfate) or single magnesium sulfate. It is found that the deterioration of concretes subjected to combined action of dry-wet cycling and magnesium sulfate solution is most severe at the initial stage. GHDC shows better corrosion resistance and surface scaling resistance under multi-factors and double-factors, and HPC has the best property when subjected to single magnesium sulfate corrosion.
high performance concrete green high durable concrete sulfate attack flezural load dry-wet cycling
Li-Ming Yang Hong-Fa Yu Hai-Yan Ma
Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjin 210016,P.R. China
国际会议
广州
英文
1106-1110
2009-11-28（万方平台首次上网日期，不代表论文的发表时间）