Title: The Role of Fine Supplementary Binder in High Performance Fiber Reinforced Cementitious Composites
Author(s): D. Hesselbarth and J. Kaufmann
Publication: Symposium Paper
Appears on pages(s): 395-410
Keywords: blended cement; consistency; fiber reinforcement; mechanical strength; microfine cement
The rheological properties, the packing density, and the final matrix strength of high performance cementitious materials can all be improved by adding fine-grain materials such as fly ash, silica fume, slag, and natural pozzolans. Beside size and shape of the added materials, their pozzolanic activity can improve the bond between the particles in the matrix and can reduce the shrinkage. In this study, the fine-grain binder systems were evaluated for application in high performance fiber reinforced cementitious composites with different type of non metallic fibers (carbon, PVA, PP). The rheological and mechanical properties of fiber reinforced composites based on ordinary portland cement and blended with micro-fine cement (mostly based on blast furnace slag), fly ash, silica fume, and limestone filler, respectively, were measured and compared to the pure fiber-cement matrix. In this context, micro-fine cement shows clear advantages compared to the other fillers. Very good mechanical properties of the composites (flexural strength > 25 MPa, compressive strength > 150 MPa) were obtained. For the estimation of the consistency of fiber-cement mixtures, a new experimental method was developed and applied.