Optimization of the MgOSiO2 binding system for fiber-cement production with cellulosic reinforcing elements

摘要: A range of MgO and SiO2 blends mixed with water are analyzed to develop clinker-free fiber-cement products reinforced cellulosic fibers. The target is the development a binder which not chemically aggressive fibers, but develops high mechanical strength Mechanical performance materials developed only influenced by magnesium silicate hydrate (M-S-H) gel content, more related void content within paste due unreacted water, meaning that gel-space ratio concept valuable in describing compressive strengths these materials. higher mix formulation leads M-S-H gels increased Mg/Si ratio. also increases over time for each mix, indicated changes structure as reaction yet complete after 28 days. SEM shows heterogeneous microstructure has regions Si content. 60 wt%MgO-40 wt%SiO2 system chosen optimal since it least alkaline strength. Bending tests on pastes pulps prove efficiency this binder, preserves reinforcing capacity fibers much better than Portland cement 200 cycles accelerated ageing.