This moisture is like a pop can sweating because its below the dew point of the air in your basement. A dehumidifier lowers the dew point of the air in your basement. When moisture condenses on concrete, the condensate diffuses through the concrete away from the wet side. Sealing the concrete stops the diffusion of water making the problem worse. If any of the concrete is covered with carpeting or boxes, the concrete is colder requiring a lower dew point to prevent sweating. Typically you need less than 50% RH to prevent the problem. You need 50 pints of dehumidification per 1,000 square feet of space. Check epa's web site for efficiency of the dehumidifiers.