Wax mixed into non-air-entrained concrete and later melted to penetrate the capillaries and pores appears to offer a promising method of protecting newly constructed bridge deck surfaces against deicer scaling and corrosion of reinforcing steel, according to a report of work done by Monsanto Research Corporation under a contract with the Federal Highway Administration. The wax is used as beads less than one-sixth inch in diameter. In tests using beads at 2 and one-half percent concentration in non-air-entrained concrete the wax completely blocked chloride penetration through 90 days' ponding with a 3 percent sodium chloride solution. The sealing procedure also prevented scaling of similarly made concrete specimens subjected to freezing and thawing in contact with the salt solution. After extensive laboratory testing of non-air-entrained concrete made with the wax and heat treated, the process was applied to a 12 by 48 foot demonstration slab 7 and one-half inches thick and containing reinforcing steel to simulate a bridge deck. After 60 days, results indicated no penetration in the internally sealed slab under continuous ponding with chloride solution. Conventional air-entrained concrete under the same conditions permitted corrosion of the reinforcing steel after 7 days' exposure.