To study the durability of concrete subjected to multiple damage factors,by adopting high concentration chemical attack solutions,we investigated the strength development of ordinary Portland cement concrete (OPC),high-strength concrete (HSC),high-performance concrete (HPC),steel fiber reinforced high-performance concrete (SFRHPC) and high elasticity module polyethylene fiber reinforced high-performance concrete (HEMPFRHPC) subjected to double damage factors (DDF),which are the combined actions of freezing-thawing cycles and chemical attack,and multiple damage factors (MDF),which are the combined actions of flexural load,freezing-thawing cycles and chemical attack.Results show that when subjected to 1 500 cycles of DDF or 1 600 cycles of MDF,the compressive strengths of all tested concretes are decreased.Further research indicates that there exists a critical stress ratio for flexural load to impair compressive strength of high grade concrete subjected to MDF,which is 40%,40%,20%,and more than 65% for HSC,HPC,PFRHPC and SFRHPC,respectively.It can be concluded that mineral admixture benefits the compressive strength of high grade concrete subjected to bittern MDF,additional steel fiber can even guarantee the continuous increase of flexural strength.