Analysis of Common Mold Materials for UHPC Components and Their Respective Advantages

The mold is the "skeleton" of UHPC component forming, and the choice of mold material directly determines component precision, production efficiency, and overall cost. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group leverages its full-chain technical accumulation to provide an in-depth analysis of the characteristics and applicable scenarios of four mainstream mold materials, offering professional selection guidance for designers and engineering parties.

I. Steel Molds: The "Industrial-Grade" Choice for Precision UHPC Components

With their high strength and high rigidity, steel molds have become the primary choice for UHPC component production. Made from Q235 steel plates through laser cutting and welding, with precisely polished and chrome-plated surfaces, they can achieve dimensional precision at the 0.1mm level, making them especially suitable for complex-shaped UHPC curtain wall panels and irregular decorative components. In the Nanjing East Road Century Plaza renovation project, Qinglong Group achieved standardized production of light-transmitting UHPC components through custom steel molds; a single mold set remained stable after more than 200 repeated uses, significantly reducing mass-production costs. Their advantages include: strong impact resistance, capable of withstanding high-pressure vibration during UHPC pouring; uniform heat conduction, preventing cracks in components caused by temperature differences; and simple maintenance—performance can be restored simply through regular rust removal and oiling.

II. GRP Molds: The "Artistic-Grade" Solution for Curved Shapes

GRP (glass-reinforced thermosetting plastic) molds, with their excellent plasticity, are the ideal vehicle for artistic UHPC components such as double-curved surfaces and openwork reliefs. Qinglong Group uses a composite process of high-performance resins and glass fibers, making molds through hand lay-up or vacuum infusion techniques to precisely replicate designers' curved visions. In the Dongguan Women and Children's Activity Center project, its GRP molds successfully achieved integral forming of double-curved UHPC cladding panels with a radius of 300mm, with surface finish reaching Ra1.6μm. The material's lightweight properties (specific gravity only 1/4 that of steel) and corrosion resistance make it particularly suitable for construction in coastal areas or humid environments, while mold costs are over 30% lower than steel molds, making it ideal for small-to-medium batch custom projects.

III. Wooden Molds: The "Economical" Option for Low-Cost Temporary Components

Multi-layer solid wood boards, after waterproofing treatment, can serve as molds for UHPC sample trial production or small-batch components. Qinglong's technical team recommends using birch or maple substrates, achieving preliminary shaping through CNC engraving, and applying an epoxy resin coating to improve surface smoothness. These molds offer advantages such as short processing cycles (completable in 3-5 days) and low cost (only 1/10 that of steel molds), making them suitable for early-stage design verification. However, note that they are prone to slight deformation after a single use; reinforcement with a steel frame is recommended, and they are not suitable for producing high-grade UHPC (compressive strength >150MPa).

IV. Aluminum Alloy Molds: The "Balanced Choice" of Lightweight and Precision

Molds made from 6061-T6 aluminum alloy through CNC machining combine the precision of steel molds with the lightweight advantage of GRP molds. The aluminum alloy molds Qinglong uses in overseas projects weigh 50% less than steel molds of the same size, significantly reducing lifting costs, and after anodizing treatment, their weather resistance is markedly improved, making them suitable for Southeast Asia's hot and humid environments. Their modular design enables rapid assembly, especially suited to assembly-line production of standardized UHPC profiles, railings, and other components, with per-shift capacity 40% higher than traditional molds.

Selecting a mold material requires comprehensive consideration of three core factors: component complexity, production batch size, and cost budget. As a national high-tech enterprise, Qinglong Group possesses mold R&D capabilities supported by 58 patented technologies and can provide full-cycle solutions from material selection and structural design to production operation and maintenance. Whether for artistic UHPC components in landmark buildings or standardized GRG ceilings in real estate projects, Qinglong can achieve a perfect balance of aesthetic effect and engineering benefit through material optimization and process innovation. Choose a professional mold solution to make every UHPC component a precise expression of architectural aesthetics.