Research progress on performance and test methods of concrete anticorrosive coating
Aims to enhance the durability of concrete in environments susceptible to chloride erosion,the research progress of concrete anticorrosive coatings,including the systematic summarization of coating protection mechanisms,classification,durability evaluation,and selection as well as application techniques of coating systems were systematically summarized.The development trends of coating material development,standardization of testing methods,and other aspects were also anticipated.The results show that coatings achieve crack sealing by forming a film on the surface,sealing internal pores,and imparting hydrophobic properties to prevent the ingress of chloride ion solutions into concrete.Different types of coatings are categorized based on their distinct functionalities,specifying suitable application scenarios for each type.The selection of coating types should consider factors such as humidity,degree of erosion,and site of application.The durability of coatings plays a pivotal role in the anti-corrosive performance of concrete.However,existing standards in the transportation industry for evaluating the durability of these coatings are inconsistent and vary widely among the three categories,which limits optimal selection and variety updates of coatings.Considering special application scenarios,it is recommended that include resistance to abrasion and erosion as additional durability evaluation criteria to establish a more comprehensive assessment system.The proper selection of coating systems and superior application techniques are crucial for effective erosion protection.The transportation industry has recommended specific coating systems for surface-filming coatings,which have facilitated the development of coating technology.However,there is a lack of assessment and monitoring of construction techniques,application effects,and long-term performance in engineering applications,which limits the transfer of experience and technological advancement.Future directions should focus on establishing environmental assessment criteria for coatings and developing functionally modified coating materials.Additionally,creating technical standards applicable across industries and unified methods for evaluating the erosion resistance of coated concrete is essential to guide and support the development in related fields.5 tabs,2 figs,67 refs.