Is UHPC's Wear Resistance Directly Related to Its Compressive Strength?

Abrasion resistance and compressive strength are important mechanical indicators of UHPC. The two are correlated to a certain extent, but not absolutely positively correlated, and are also affected by multiple factors such as aggregate properties, microstructure, and fiber type. As an enterprise with extensive experience in industrial and municipal projects, Qinglong Group combines test data with engineering practice to analyze the relationship between the two and the influencing factors.

Basic correlation: Compressive strength provides structural support for abrasion resistance. UHPC's abrasion resistance derives from a dense microstructure and a hard matrix, while high compressive strength usually means a denser matrix with stronger cohesion, capable of resisting the penetration and cutting of external abrasive particles. Qinglong's test data show that UHPC with a compressive strength ≥150MPa has an abrasion loss rate ≤0.3kg/m² (500 revolutions); products with 120MPa compressive strength have an abrasion loss rate of about 0.5-0.6kg/m². In the industrial plant floor project of the Shenzhen Yirui Biotechnology Building, Qinglong's steam-cured UHPC (compressive strength 160MPa) withstood long-term equipment rolling and foot traffic; after 5 years of use, the surface wear depth was ≤0.5mm, far superior to ordinary UHPC with 120MPa compressive strength. The core of this correlation is: the low porosity (≤0.8%) corresponding to high compressive strength reduces penetration channels for abrasive particles, and the hard C-S-H gel matrix can resist particle cutting.

Non-absolute correlation: Aggregates and fibers are key complements to abrasion resistance. At the same compressive strength, aggregate type and fiber addition significantly affect abrasion resistance. Qinglong uses high-hardness quartz sand (Mohs hardness 7) as aggregate, which reduces the abrasion loss rate by 20%-30% compared with ordinary river sand (Mohs hardness 5-6); UHPC with copper-coated steel fibers added (3% dosage) improves abrasion resistance by 40% over fiber-free samples, because fibers can prevent the propagation of micro-cracks caused by wear and delay surface spalling. For example, of two products with the same 150MPa compressive strength, one using ordinary river sand with no fibers has an abrasion loss rate of 0.45kg/m²; the other using high-hardness quartz sand with steel fibers has a loss rate of only 0.28kg/m². In municipal road sidewalk projects, the latter's service life is more than 30% longer than the former's.

The regulating role of microstructure and surface treatment. Even at the same compressive strength, the density of the microstructure and surface treatment processes also affect abrasion resistance. Through steam curing, Qinglong reduces UHPC porosity to below 0.8%, improving abrasion resistance by 25% compared with natural curing (porosity 1.5%); UHPC with a polished surface makes it difficult for abrasive particles to adhere, reducing the abrasion loss rate by 15%-20% compared with untreated samples. In the light-transmitting concrete floor project at Century Plaza on Nanjing East Road in Shanghai, Qinglong used a combination of "high-hardness aggregate + steam curing + surface polishing" to enable a product with 150MPa compressive strength to reach the abrasion resistance level of ordinary products at 180MPa compressive strength, ensuring both function and cost control.

Selection principles in practical applications. When making selections, customers should not judge abrasion resistance by compressive strength alone but need comprehensive consideration: for high-frequency wear scenarios such as industrial plants and municipal roads, prioritize the combination of "high compressive strength (≥150MPa) + high-hardness aggregate + steel fibers"; for decorative components and low-frequency wear scenarios, aggregates and surface treatment can be optimized while ensuring a compressive strength ≥120MPa. Qinglong Group provides customers with customized abrasion-resistant solutions. For example, in a UHPC floor project in a chemical industrial park, by adjusting aggregate gradation and fiber dosage, the abrasion performance met industrial-grade use requirements at a compressive strength of 140MPa, which is more economical than simply pursuing high compressive strength.

UHPC's abrasion resistance is basically correlated with compressive strength, but it is modulated by factors such as aggregates, fibers, and microstructure, and is not absolutely positively correlated. Through material formulation optimization and process innovation, Qinglong Group has achieved a coordinated improvement of abrasion resistance and compressive strength, both avoiding the cost waste caused by blindly pursuing high compressive strength and meeting abrasion-resistance needs in different scenarios. Customers are advised to consult manufacturers' specialized abrasion-resistance solutions first in high-frequency wear projects, rather than relying solely on compressive strength indicators for product selection.