Study on the influence of ultrafine titanium slag on the properties of ultra-high performance concrete

This work aims to develop a green, cost-effective ultra-high performance concrete [UHPC] by utilizing titanium slag. The impact of ultra-fine titanium slag on the hydration process, mechanical properties, and microstructure of UHPC was systematically investigated by employing various testing methods including hydration heat and mechanical property assessments, along with microscopic analysis techniques such as XRD, TG, microhardness and pore structure analysis. The findings indicate that substituting granulated blast furnace slag with ultra-fine titanium slag accelerates the reaction in UHPC, accelerating the formation of hydration products. The ultra-fine titanium slag demonstrates exceptional performance in optimizing the pore structure, enhancing the interfacial transition zone of UHPC, and increasing the paste microhardness. UHPC mixed with ultra-fine titanium slag exhibits superior mechanical properties compared to the control sample, with these properties initially increasing and then decreasing as the content of ultra-fine titanium slag increases.