SULPHOALUMINATE CEMENT MATRICES USED FOR TEXTILE AND GLASS FIBRE REINFORCED CONCRETE ELEMENTS

摘要

This paper deals with the comparison between textile and fibre reinforced thin concrete elements made with different types of concrete mixtures. Mixtures mainly based on Portland cement combined with fly ash from hard coal and silica fume were used among which sulphoaluminate cements (SAC) were tested. These cements are characterized by their fast hardening, impermeability, frost and corrosion resistance, as well as the low pH of their pore solution and low shrinkage or sometimes expansion. These aspects suggest that sulphoaluminate cements could be favourably used for thin textile or fibre reinforced elements. Moreover these cements may become of interest if one wants to produce thin textile reinforced and prestressed concrete elements. The durability of glass fibre reinforced cement (GRC) is generally thought to be influenced by the alkalinity of the matrix and precipitation of hydration products like calcium hydroxide in between a roving. Many investigations have studied the durability of glass fibre reinforced Portland cements (OPC) in combination with metakaolin or calcium sulphoaluminate. However, it has not been clarified up to now which effects were in detail responsible for the decrease of the fibre strength. In the paper, some results of durability tests of glass and aramid filaments are presented in the context of optimising textile (TRC) and fibre reinforced concretes.