ES257479A3 - A method for joining wires in the concrete members tension (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A method for grouting the wires in the tensioning of elongated bodies of porous concrete, by using a group of wires and the like that extend through a cavity of small diameter and considerable length that passes through the concrete body, being said wires placed in said cavity so that they leave free space therein around the wires and throughout their length, the connection being made by adherent slurry the wires while they are maintained in position in said cavity under mechanical stress, the method comprising the steps of: first obliging the slurry, initially in a fluid state with a high ratio of water to cement, comprised between approximately 0.85 and approximately 0.30, to enter the free space along said wires and between and around the wires until the entire cavity, including said free space along the wires, is filled with extrusion grout. end of the elongated concrete organ, each of said wires remaining, along its peripheral extension, essentially surrounded by and in contact with said slurry, preventing leakage of the slurry at the ends of said cavity and applying said slurry a sufficiently high pressure, of at least 5.5 kg/cm2 approximately, to force the water coming from the slurry to penetrate deeply into the porous walls of the cavity, along its length, in the concrete, retaining at the same time in the cavity to the cement content of the slurry; and then maintain the slurry at high pressure, in the entire cavity, for at least about 1 to 3 minutes, while being forced to enter new quantities of slurry in the cavity to compensate for the water transferred to the interior of the concrete, reducing with the ratio of water to cement of the grout in the cavity to give firmness to the grout in the entire cavity, from one end to the other of the concrete organ, and thus obtain a firm grouting based on grout in the entire cavity , with the peripheral surfaces of the wires embedded and adhered throughout their length to said slurry, said plugging having a lower water to cement ratio, as well as a reduced shrinkage factor during setting and, once set or hardened by around of the wires, a greater resistance of adhesion and a greater resistance to compression. (Machine-translation by Google Translate, not legally binding)