The invention discloses a method for improving durability of a concrete product by using a carbonized
coating, which comprises the following steps: uniformly mixing 80-100 parts of a carbonized active cementing material, 0-20 parts of an auxiliary
calcium source, 0.1-2.0 parts of a carbonized layer reinforcing agent, 1-6 parts of a water
reducing agent and 25-45 parts of water to obtain a carbonized
coating; and
coating the carbonized coating on the surface of a
product matrix, and standing and carbonizing to obtain the concrete product coated with the carbonized coating. By introducing the auxiliary
calcium source, the
carbonization time can be shortened, the
utilization rate and the production efficiency of the
carbonization device can be improved, and the requirements of a product production process are met; and by applying the carbonized coating prepared from the carbonized active cementing material such as the steel
slag to the surface of the concrete product, the purpose of economically, conveniently and effectively improving the durability of the concrete product through the
calcium carbonate coating is achieved, meanwhile, the application range of the carbonized active cementing material is widened, a large amount of
carbon dioxide can be immobilized, and the method has obvious environmental benefits.