MOISTURE MOVEMENTS OF ADVANCED FIBERS REINFORCED CEMENTITIOUS MATERIALS PRODUCED BY EXTRUSION MOULDING(Materials and Construction)

Abstract

Five kinds of advanced fivers, carbon, polypropylene, hydrophilic polypropylene, sepiolite, and aramid, were assessed for the substitutes of the asbestos that had been used as a standard fiber additive of extruded cementitious materials. Each linear line with the logarithm of the repetition number indicates the strains caused by the wet and dry repetitions. The amplitude strain and the residual one become stable at lower water content ratio in the early stage of the repetitions. The study found that treating the surface of the fibers like asbestos, mixing the fibers fully, and managing the extruding pressure were crucial to avoid the redundant shrinkage and expansion of materials.