Providing and applying crystalline mortar by mixing in the ration of 4.5 :1(4.5 parts crystalline mortar : 1 part water) for the treatment of faulty construction joints, cracks, tie rod holes and spalled & honeycombed surface of RCC underground structures like basement, water tanks, bridge deck etc. to ensure water tightness. The crystalline morter shall conform to the EN 1504-3 having compressive strength Class R4 ? 45 MPa and adhesive bond strength Class R3? 1.5 MPa. The work shall be carried out all complete as per specification and the direction of the engineer-in-charge. The product performance shall carry guarantee for 10 years against any leakage. For patching of tie rod holes, prepared tie rod hole surface is tacky repair and then filled the tie rod holes with crystalline mortar @ 0.40kg per hole. The crystalline mortar should be tightly (For 25x25x25xmm tie rod hole, use 0.040kg to fill the hole)