What Are the Material Requirements for Embedded Parts Used in UHPC Component Installation? Qinglong UHPC Embedded Parts Technical Standard

Embedded parts for UHPC components must use austenitic stainless steel (06Cr17Ni12Mo2) or hot-dip galvanized steel (galvanized coating ≥85μm), with yield strength ≥235MPa. Qinglong UHPC strictly stipulates: outdoor parts must use 304 or higher grade stainless steel, indoor parts may use Q235B galvanized steel, and passivation treatment is required after galvanizing.

In terms of corrosion resistance, 304 stainless steel in an environment with a Cl- concentration of 0.1% has an annual corrosion rate <0.01mm; hot-dip galvanized steel in dry environments has an annual corrosion rate <0.001mm. The bond strength between embedded parts and UHPC must be ≥6MPa, achieved through surface knurling (depth 0.3mm) or welded anchor plates. Inspection of a coastal project in Shenzhen after 5 years of use showed no rust on the stainless steel embedded parts, with a bond strength retention rate of 95%.

Material Selection Criteria

Outdoor environments: 304/316 stainless steel; indoor dry environments: hot-dip galvanized steel; these choices ensure durability.

Anti-Corrosion Treatment Requirements

Galvanized coating thickness ≥85μm; stainless steel passivation treatment; these treatments improve corrosion resistance.

Structural Design Key Points

Anchorage length ≥10d; surface knurling depth 0.3mm; these designs ensure anchoring force.

Installation Precision Control

Positional deviation ≤±3mm; verticality ≤1/300; these controls ensure accuracy.

The quality of embedded parts is critical. Qinglong UHPC maintains strict control to ensure safety.