Review of Experimental Ultra-High Performance Concrete Mixes with Extreme Strengths

• Sheelan Mahmoud Hama

  University of Anbar

Ultra-High-Performance Concrete (UHPC) has redefined the strength limits of cementitious materials over the past two decades. This brief communication synthesizes experimental studies reporting record-breaking non-proprietary UHPC mixes developed since the mid-2000s. The focus is on mix designs that achieve compressive strengths ranging from 200 to 300 megapascals (MPa) and direct tensile strengths of up to 15 MPa (flexural strengths of up to 45 MPa). The key parameters that contribute to these strengths are systematically examined, including cementitious content, silica fume proportion, supplementary powders, fine sand gradation, superplasticizer dosage, and steel fiber type and volume fraction. The influence of curing regimes, ranging from ambient conditions to extended steam and high-temperature treatments, is also compared. The findings of the study substantiate that particle packing optimization, low water-to-binder ratios (0.16–0.22), and strategic fiber reinforcement are pivotal to attaining exceptional performance. These findings offer a concise evaluation of the current state of UHPC strength achievements and indicate future innovations, including nano-modified binders, advanced fiber geometries, and sustainable cement replacements that have the potential to further enhance strength and durability.

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