Through the method of accelerated freezing-thawing and room-temperature corrosion

the stress corrosion of three kinds of concretes subjected to 5.0%MgSO4(in mass)solution was studied. The considered concretes include High Strength Concrete(HSC)

High-Volume Mineral Admixture Concrete(HVMAC) and High Durable Concrete(HDC) added with high-volume mineral admixture

air-entraining agent

superplasticizer

fibers and expansion agent. The results showed that the relative dynamic elastic modulus of concrete went through strengthen and deterioration stages subjected to stress corrosion

whether the room temperature or freezing and thawing conditions. The length of time of these two stages are closely related with the experimental temperature. Freezing and thawing action significantly accelerated the process of sulphate stress corrosion damage. Under the action of freezing and thawing

stress corrosion strengthening the period length of HSC shorter 96%

deterioration section of the length of time shorter 88%

compared with the length of time at the corresponding room temperature. Deterioration section of the length of time of HVMAC is reduced by 98%

while the HDC reduced by 71%. The effect of freezing and thawing

HDC freezing-thawing cycles when the stress corrosion damage occurred were longer 1.5 times and 13 times than the HSC and HVMAC. Thus in the cold regions

HDC showed more resistance to sulfate stress corrosion.