Yail Jimmy Kim
University of Colorado, Denver; Colorado Department of Transportation
Admixtures; Bridge construction; Compressive strength; Cost effectiveness; Infrastructure; Silica; Sustainable development; Ultra high performance concrete
This report presents the development of ultra-high performance concrete (UHPC) using locally available materials that reduce construction costs compared with commercial products. With the aim of achieving a specified compressive strength of 20 ksi, a UHPC mixture is formulated. The implications of various constituent types are examined with an emphasis on silica compounds (silica fume, silica powder, silica sand, finer silica sand, pyrogenic silica, and precipitated silica), including steel and polypropylene fibers. Bond tests are conducted to evaluate the development length of the UHPC. Cost analysis shows that the prototype UHPC is up to 74% less expensive than commercial products.