A method of repairing concrete slabs that have become uneven and dangerous is provided that employs lime sludge that is injected under pressure into the space between the lower surface of the damaged concrete slab and the underlying ground to raise that slab back into a level orientation. The polymer is an acrylic copolymer formed as the reaction product of a plurality of monomers which include an alkyl acrylate, a quaternary amine acrylate, a hydroxyalkyl acrylate, an N-vinyl lactam, an ethylenically unsaturated carboxylic acid, and a fluorinated acrylate. The control circuit 20 includes a first diode group having a first end from which a first current is passed in a forward direction by a first current source and a second end connected to a first end of the wire, and a second diode group having a first end from which a second current is passed in a forward direction by a second current source and a second end connected to a second end of the wire. The hydraulic circuit is made in the thickness of the plate and has a geometric grid development, along which a plurality of hydraulic sub-circuits are disposed and switching means to define desired paths. When packets are transmitted and received between mobile terminals within the mobile communication network, the packets are communicated, not by way of external networks, but by way of virtual networks that correspond to each external network that have been prepared on the mobile communication network.