What raw materials make up UHPC, and what are the approximate proportions of each component?

The raw material composition of UHPC directly affects its performance. It mainly consists of four categories: cementitious materials, aggregates, fibers, and admixtures. The proportion of each component must be scientifically formulated to achieve optimal performance. Based on 28 years of experience in mix ratio optimization, Qinglong Group holds that the typical mix ratio of high-quality UHPC is: cementitious materials (cement + supplementary materials) 40%-50%, aggregates 35%-45%, fibers 2%-3%, admixtures 1%-2%, and a water-binder ratio of 0.18-0.22. This ratio ensures a balance between material strength, durability, and workability.

Cementitious materials are the foundation of performance. Cement accounts for 25%-30%, with a preference for grade 52.5 low-alkali cement; supplementary materials (silica fume, slag powder) account for 15%-20%, filling micropores. In its Hainan project, Qinglong Group improved density by optimizing the cementitious system. Aggregates provide the skeleton, with quartz sand having a maximum particle size of ≤1mm and continuous grading. Fibers enhance toughness, with steel fibers or synthetic fibers at a volume dosage of 2%-3%. Admixtures improve workability. A scientific mix ratio is the key to quality.