You can try using a product called xypex, usually purchased from a concrete supplier, it works best when the water is coming through and the area is damp. Theres one called patch and plug and then there is one thats a skimcoat, i usually bought both, and used a combination, works great for cylinder replacements when you have to patch up the concrete. Ive had a lot of success of this product up here on the west coast of Canada. Xypex.com