The wall needs to be moist so that the old concrete won t leach moisture out of the mortar that you apply and cause the repair to fail.
Moist basement concrete wall repair crumbling.
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Wash the walls with an acidic solution check on amazon to neutralize the salt completely and allow to dry for a few hours.
Apply small amounts of water over a short period until it has absorbed water deep into the wall.
First off brush off any loose material from the basement walls.
Now you should apply water to the wall where you will be applying the mortar.
Mist the wall with water and then apply a coat of thoroseal with a latex additive check on amazon.