Is UHPC Abrasion Resistance Directly Related to Compressive Strength?

The abrasion resistance of UHPC is positively correlated with its compressive strength, but the latter is not the sole determining factor—aggregate hardness, compactness, surface condition, and other factors also affect abrasion resistance. Through the combination of "high strength + high-hardness aggregates + densification processes," Qinglong has achieved an abrasion resistance 5-8 times that of ordinary concrete for UHPC, making it suitable for high-frequency wear scenarios such as industrial floors and bridge decks.

I. Positive Correlation: Compressive Strength Provides the Foundation for Abrasion Resistance

Compressive strength reflects the density and bonding capacity of the UHPC matrix, directly affecting abrasion resistance. The higher the strength, the better the abrasion resistance: UHPC with a compressive strength of ≥150MPa has an abrasion loss (500 cycles) of ≤0.3kg/m²; UHPC at 120MPa has an abrasion loss of ≤0.5kg/m², while Qinglong's 180MPa-grade UHPC shows an abrasion loss of only 0.2kg/m². Mechanism analysis: high compressive strength means strong internal bonding within the matrix and firm interfacial adhesion between aggregates and cementitious materials, making particles less likely to detach during wear, whereas low-strength UHPC has a loose matrix, prone to surface sanding and particle peeling. Project verification: a Qinglong industrial floor project using 160MPa-grade UHPC, after 3 years of high-frequency vehicle traffic, showed a surface wear depth of ≤0.5mm, far superior to ordinary concrete floors (wear depth ≥3mm).

II. Other Key Influencing Factors: "Bonus Points" for Abrasion Resistance

Compressive strength alone cannot achieve optimal abrasion resistance; multiple factors must work in synergy. Aggregate hardness: using high-hardness aggregates such as quartz sand (Mohs hardness 7) and corundum sand (Mohs hardness 9) improves abrasion resistance by 30%-50% over ordinary river sand; Qinglong's abrasion-resistant UHPC uses a composite of quartz sand and corundum sand. Compactness: UHPC with porosity ≤2% offers 25% better abrasion resistance than that with 3% porosity; through dense packing design and steam curing processes, Qinglong keeps the porosity of its abrasion-resistant UHPC at ≤1.5%. Surface treatment: surface polishing and penetrating hardening treatment can further enhance abrasion resistance; after penetrating hardening treatment, the wear resistance of Qinglong's industrial floor UHPC improves by an additional 20%. Fiber effect: steel fibers enhance matrix toughness, reduce crack propagation during wear, and lower abrasion loss by 15%-20%; Qinglong's abrasion-resistant UHPC incorporates 2.5% steel fibers.

III. Uncorrelated Scenarios and the Company's Optimization Solutions

Under special circumstances, compressive strength and abrasion resistance may become disconnected. Uncorrelated scenarios: when low-hardness aggregates are used (e.g., limestone sand, Mohs hardness 3-4), abrasion resistance remains poor even if compressive strength reaches 150MPa; when the matrix has low compactness (porosity ≥4%), even high strength struggles to deliver abrasion resistance. Qinglong's optimization solutions: for scenarios requiring abrasion resistance, Qinglong has launched an integrated solution of "high strength + high-hardness aggregates + densification + surface treatment," using quartz sand with Mohs hardness ≥7 as aggregate, a cementitious system combining cement + silica fume + ultra-fine fly ash, together with a steam curing process, while also providing surface hardening treatment services. Testing standards: tested in accordance with the "Test Methods for Abrasion Resistance of Concrete" (GB/T 50082), Qinglong's abrasion-resistant UHPC shows a 500-cycle abrasion loss of ≤0.25kg/m², far exceeding the industry standard (≤0.8kg/m²).