Method to Calculate Cement Content in Hardened Concrete Based on Theory of Carbonization

Once concrete is set and hardened, it is very hard to evaluate its primitive composition once again. Currently, the conditions required for testing of original cement content in the hardened concrete are severe; the test is complicated, and the test precision is hard to be guaranteed. To explore a convenient and easy method to calculate the cement content in the hardened concrete, in this test, concrete of different mixture proportions was prepared and the carbonation depth of concrete at different curing ages was tested. Based on formulas in references and experimental results, a method to determinate the cement content in hardened concrete via carbonization depth was put forward, in which many influences such as CO2 concentration are taken into consideration. The result shows that the feasibility of this method is good, which can provide a certain reference for practical engineering.