Study of Using Quartz Powder as a Mineral Admixture to Produce Magnesium Oxysulfate Cement

Magnesium oxysulfate (MOS) cement features potential advantages, including light weight, green and environmental protection, low thermal conductivity, high frost- fire-resistance, but its poor mechanical strength limits the extensive utilization in architectural engineering. In this study, low-cost quartz (Q) was used as a mineral admixture to increase of MOS pastes. The impact filler Q on early later investigated, which also had an fluidity, setting times, volume stability, hydration processes, phase transformations, microstructure. results show that periclase form 5Mg(OH)2·MgSO4·7H2O (phase 5-1-7) system multi-stage reaction process. 3Mg(OH)2·MgSO4·8H2O first sediment converted into 5-1-7. dilution dispersion effects increased rate, shortened time, content crystallite size 5-1-7, increasing cement, while volume-filling effect reduced large pore total volume, improved structure improving cement. containing 15 wt.% exhibited highest strength, lowest shrinkage, is more suitable for application Based these results, can be enhancer however enhancement mechanisms are effective only when no than 20 wt.%.