Research on the preparation and performance of C140 white decorative ultra-high performance concrete
GENG Chundong
Abstract：This study investigates the effects of factors such as the composition of cementing materials,sand-to-binder ratio,water-to-binder ratio,and titanium dioxide content on the flowability,whiteness,mechanical properties,and water absorption of C140 white decorative ultra-high-performance concrete,and explores its micro-mechanisms of ultra-high strength using XRD and SEM testing techniques.The results indicate that the suitable proportions of white Portland cement,white silica fume,ultrafine mineral powder,and heavy calcite powder in C140 white decorative ultra-high-performance concrete are 65%,20%,10%,and 5%respectively,with an appropriate sand-to-binder ratio of 1.1,water-to-binder ratio of 0.19,and titanium dioxide content of 2.5%.The prepared materials exhibit a flowability of 290 mm,whiteness of 92%,28 day compressive strength of 155 MPa,and water absorption of 1.2%.In the early stages of hydration,a large amount of hydration products adhere to or intertwine within the C-S-H gel structure and form a unified whole with the heavy calcite powder,providing early strength.In the later stage of hydration,the substantial generation of hydration products from the cementing materials,especially C-S-H gel,significantly increases the density of the cement paste,ensuring later strength.
Keywords：composition of cementitious materialsC140 white decorative UHPCmicroscopic mechanismhydration product
Publication Date：2025-07-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 80-83 )