UHPC is known for its ultra-high compressive strength (usually exceeding 120 MPa), high toughness, and excellent durability, and is suitable for foundation column structures, beams, bridges, seismic and blast resistant engineering, and marine environments.
Compared to ordinary concrete, the amount of UHPC cementitious material used is 800 to 1100 kg/m ³, which is about 3 to 4 times that of ordinary concrete, resulting in a higher carbon footprint.
The main technological paths to achieve low-carbon UHPC include: mix design optimization (experimental optimization, statistical factor design, dense packing method), waste substitution (high silicon waste replacing cementitious materials, recycled aggregates replacing natural aggregates, waste fibers replacing steel fibers), and geopolymer cementless UHPC.
However, the definition of low-carbon is still unclear, and there is a lack of quantitative comparison between carbon emissions and energy consumption.
Some studies overlook the minimum strength requirement of UHPC at 120 MPa.
This review aims to systematically identify the most promising low-carbon UHPC technology paths by establishing a detailed inventory database.
.