Methods and apparatus for continuously extruding a hydraulically settable mixture and simultaneously placing continuous filaments within the extruding mixture to yield articles having a filament-reinforced, hydraulically settable matrix. The filaments can be placed within the mixtures...http://www.google.es/patents/US5798151?utm_source=gb-gplus-sharePatente US5798151 - Hydraulically settable articles which include helically wound filaments
Hydraulically settable articles which include helically wound filaments
