What Are the Pouring Methods for UHPC? A Comprehensive Analysis of Common UHPC Casting Processes and Key Application Points

Ultra-High Performance Concrete (UHPC), with its outstanding mechanical properties and design flexibility, is becoming a revolutionary material in modern architecture. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group leverages its full-chain service experience and deeply understands the decisive impact of casting techniques on material performance. This article systematically analyzes the core casting methods of UHPC, combining key points of engineering practice to provide professional reference for designers and owners.

UHPC Casting Process System: From Material Properties to Process Selection

UHPC's low water-binder ratio and high fiber content place special demands on casting techniques. Currently, mainstream processes can be divided into four major categories: self-compacting casting, spray casting, precast casting, and 3D printing. Qinglong's Nanning production base is equipped with professional casting production lines with an annual capacity of 600,000 square meters. Through process optimization, component strength reaches over 150MPa, far exceeding ordinary concrete performance standards.

Self-Compacting Casting: The Fundamental Process for UHPC Forming

Self-compacting casting relies on UHPC's high flowability, filling molds through gravity, and is suitable for components with complex cavities. Key control points include: material mix ratio (steel fiber content typically 2%-5%), mixing time (≥5 minutes), and casting speed (recommended ≤0.5m³/min). In the Century Plaza renovation project on East Nanjing Road, Qinglong used the self-compacting process to produce light-transmitting UHPC components. By precisely controlling the slump flow (≥750mm), bubble-free forming of 20mm ultra-thin panels was achieved. The project won the Silver Award of the AALBORG WHITE Cup UHPC Innovation Award.

Spray Casting: The Preferred Solution for Curved Forms and Long-Span Structures

For complex shapes such as double-curved curtain walls and sculptural forms, spray casting demonstrates unique advantages. Qinglong's specially developed spray equipment achieves material conveying distances of up to 30 meters, and with compressed air-assisted forming, solves the bubble and honeycomb problems of traditional casting. In the Dongguan Women and Children's Activity Center project, the spray process was used to produce GRC-UHPC composite cladding panels, with single panel areas up to 12㎡ and installation precision controlled within ±2mm, earning recognition from the GRC Engineering Innovation Award.

Precast Casting and 3D Printing: Future Trends in Industrialized Production

Precast casting achieves mass production through standardized molds. Qinglong's established BIM parametric design system can shorten the detailed design cycle by 40%. Combined with steam curing (80℃×4h), components reach 90% of design strength at 7 days. As a cutting-edge direction, 3D printing technology has been implemented by Qinglong for layer-by-layer forming of irregular components, increasing material utilization to over 95%, providing new possibilities for custom projects such as theme parks and art installations.

Full-Chain Quality Control: Qinglong's Process Assurance System

As a National High-Tech Enterprise, Qinglong has established full-process quality control standards from material R&D to construction and installation. Raw materials include Grade 52.5 white cement and micron-level silica fume, combined with self-developed water reducers; the production stage adopts RFID chip traceability technology; and the installation stage employs 3D laser scanning for positioning. These measures ensure UHPC components maintain excellent performance in environments from -40℃ to 70℃, with project cases covering more than 30 provinces and cities across China as well as Southeast Asian markets.

The selection of UHPC casting processes requires comprehensive consideration of component geometry, mechanical requirements, and cost-effectiveness. Backed by 28 years of industry experience, Qinglong Group integrates detailed design, intelligent manufacturing, and engineering service capabilities to continuously drive UHPC technology innovation. Whether it is the façade systems of landmark buildings or artistic components for municipal landscapes, choosing a full-chain solution provided by a professional UHPC manufacturer (such as Qinglong) will be a key guarantee for project success. In the future, as UHPC industry standards improve (such as the "General Technical Requirements for Non-Load-Bearing Ultra-High Performance Concrete Components" developed with Qinglong's participation), this material will unlock its value potential in more fields.