Effect of partial substitution of cement with Dolomite powder on Glass-Fiber-Reinforced mortar

Glass fibers are susceptible to corrosion in alkaline environments, which reduces the strength and durability of Glass-fiber-reinforced cementitious composites (GFRCs) and limits their application. In this study, the possibility of recycling waste dolomite powder (DP) and improving the mechanical properties and durability of glass-fiber -reinforced mortar (GFRM) by substituting a certain amount of cement with DP was investigated. An experimental study was conducted to evaluate the effects of the DP content (0%, 5%, 10%, 15%, and 20%) on the fluidity, compressive strength, flexural strength, water absorption rate, drying shrinkage, and microstructure of GFRM. The results showed that adding DP in GFRM improved fluidity, the long-term strength and durability of GFRM, and reduced the chloride ion electric flux, the alkalinity of the pore solution and drying shrinkage of GFRM, and protected the glass fibers against corrosion by calcium hydroxide solution. The optimal DP content was 10%. Incorporating DP in GFRCs is conducive to improving the performance of GFRCs, recycling waste DP and environmental friendliness by reducing cement consumption and carbon dioxide emissions.

Automated summary

By adding waste dolomite powder (DP) and substituting cement, the mechanical properties and durability of glass-fiber-reinforced mortar (GFRM) can be improved, reducing the susceptibility of glass fibers to corrosion in alkaline environments.