Improvement of Durability and Change of Pore Structure for Concrete Surface by the Penetrative Surface Protection Agent Kang, Suk-Pyo; Kim, Jung-Hwan;
Recently, surface finishing and protection materials were developed to restore performance of the deteriorated concrete and inhibiting corrosion of the reinforcing-bar. For this purpose, surface protection agent as well as coatings are used. Coatings have the advantage of low Permeability of and water. However, for coatings such as epoxy, urethane and acryl, long-term adhesive strength is reduced and the formed membrane of those is blistered by various causes. Also when organic coatings are applied to the wet surface of concrete, those have a problem with adhesion. On the other hand, surface protection agent penetrates into pore structure in concrete through capillary and cm make a dense micro structure in concrete as a result of filling effect. Furthermore, the chemical reaction between silicate from surface protection agent and cement hydrates can also make a additional hydration product which is ideally compatible with concrete body. The aim of this study is to examine the effect of penetrative surface protection agent(SPA) by evaluating several concrete durability characteristics. The results show that the concrete penetrated surface protection agent exhibited higher durability characteristics for instance, carbonation velocity coefficient, resistance to chemical attack and chloride ion penetration than the plain concrete. These results due to formation of a discontinuous macro-pore system which inhibits deterioration factors of concrete by changed the pore structure(porosity and pore size distributions) of the concrete penetrated surface protection agent.
penetrative surface protection agent;porosity;pore size distribution;improvement of durability;concrete surface;
ASTM Standard C 1202, 'Electrical Indication of Concrete's Ability to Resist Chloride Ion Penetration', ASTM, 1990
AASTO, 'Standard Specification for Transportation Materials and Methods of Sampling and Testing', Fourteenth Edition, American Association of State Highway and Transportation Officials, Washington D.C., 1986