A THEORETICAL MODEL FOR ASSESSING ELASTIC MODULUS OF CONCRETE CORRODED BY ACID RAIN

Elastic modulus is an important mechanical parameter of concrete, which has a significant effect on the static and dynamic response of a concrete structure. To investigate the elastic modulus of concrete corroded by simulated acid rain, a theory model was put forward based on Composite Micromechanics. Three series of accelerated corrosion tests were executed on concrete C40. Three kinds of simulated acid rain solutions, whose pH are 1.5, 2.5 and 3.5, respectively, are applied as the corrosive medium. The calculated results show good agreement with the experimental data. It can be concluded that the volume fraction of the void, which is corroded by acid rain, is an important factor of the concrete; and the variation of the elastic of concrete D is taken as a damage index, it is found that D has a larger fluctuation at the initial corrosion stage, and with the increasing of corrosion duration, D will have a significant increase. It is also shown that the higher concentration of the solution, the more severe damage and the stronger regular form will be occurred on the specimen.