Enhanced Frost Resistance in Composite Materials Through Incorporating Waste Ceramic Fiber-Reinforced Cement
This study explores the integration of ceramic powder and polyvinyl alcohol(PVA)fibers into cement-based materials to improve frost resistance.By partially replacing cement with ceramic powder and substituting conventional river sand with ceramic sand,mortar specimens are created and subjected to freeze-thaw cycling tests.Analysis of changes in mass loss rates and relative dynamic elastic modulus,along with investigations using electrochemical impedance testing and scanning electron microscopy,reveal key findings.Ceramic powder,with significantly higher SiO2 and Al2O3 content than cement,and particle diameter smaller than 20 μm(constituting 82.3%),enhances specimen density through volcanic ash and microaggregate effects,thereby boosting frost resistance.Optimal results are achieved with 2.2%PVA fiber content and 30%ceramic powder content,resulting in minimal mass loss,maximum relative dynamic elastic modulus,highest continuous conductive path resistance,and minimal freeze-thaw damage after 100 cycles.The study identifies the fiber-matrix interface as the vulnerable aspect impacting the frost resistance of this composite material.
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