Ecological Study of Deterioration Performance for Concrete in Saline Soil Environment

According to the principles of terrestrial ecology, the deterioration of concrete used in highway engineering in saline soil environment of Inner Mongolia was studied, and simulated in the laboratory compound salt solution (NaCl, Na2SO4, NaHCO3 and Na2CO3), single salt solution (Na2SO4) and test pieces for mix proportion of three kinds of concrete for datum, mixing 20% fly ash and mixing 20% metakaolin etc. Prediction model of deterioration in concrete was established. It is shown that ecological capacity of anti-wetting-drying cycle in concrete mixing metakaolin is the strongest in compound salt-freeze-thaw cycle test and single salt-freeze-thaw cycle test, freeze-thaw resistance of concrete mixing fly ash is the strongest. Measured values for deterioration prediction model of compressive strength of compound salt-wetting-drying cycle and deterioration prediction model for relative dynamic elastic modulus of compound salt-freeze-thaw cycle were respectively verified in the test, and fitting degrees were respectively 0.880 and 0.929. Resources such as Metakaolin and fly ash in the environment were utilized to improve concrete durability in the environment, which had practical guidance meaning to performance deterioration prediction of concrete material under working condition and environment.