Cases of concretes freeze resistance lack in new viaducts built during the winter time in the 2002-2

• 作 者: J(o)zefJasiczak;Agnieszka(S)losarczyk;
• 机 构: Institute of Structural Engineering, Poznan University of Technology, 60-965 Poznan, Poland
• 出 处: The 14th International Congress on the Chemistry of Cement (
• 发表日期: 2015年期

　　In the latest period hundreds of concrete viaducts were built in Poland within a short time range.Their characteristic feature was the use of high class concrete containing the CEM I 42,5 cement (struts and abutments) and the CEM I 52,5 cement (spans).Construction often took place during winter time.Despite successful laboratory tests the concrete prepared on the construction site often did not achieve the assumed freeze resistance F 150.The lack of freeze resistance in concrete has an unusual course.Higher than normative decrease of strength occurs with simultaneous high tightness.There is no surface spalling, typical for the low freeze resistance concrete, no edge curvature, etc.On the sample surface however, a characteristic mesh of white leakage of unknown chemical compounds appears around big aggregate grains.Those compounds were thoroughly investigated with the using SEM analysis.Is known a similar case from 2002 year of freeze resistance lack along with white compound leakage on the area borderlines in the aggregate.