Perma Construction Aids Pvt. Ltd. Offers Micro-Concrete Fluid. Perma Construction Aids Pvt. Ltd. Is an ISO 9001:2000 certified company. The model name of Micro-Concrete Fluid is Perma Recrete. The Micro-Concrete Fluid is a grey powder mixed with water form free flowing slurry which hardness to form a high strength micro-concrete. The Micro-Concrete Fluid is high strength concrete liquid used for repairing damaged columns and beams. The coverage area of Micro-Concrete Fluid is 25 kg sack gives 11 liters or repair concrete. This fluid is available in 10 kg and 25 kg packs.