Cause Analysis and Solutions for Air Bubbles on UHPC Component Surfaces

Quality Builds Reputation, Details Determine Success — 28 Years of Industry Experience, Qinglong Safeguards UHPC Component Quality

In the field of architectural decoration, UHPC (Ultra-High Performance Concrete) has become the preferred material for high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to its outstanding mechanical properties and artistic expressiveness. However, surface bubbles on components are like “flaws in fine jade” — they not only compromise aesthetics but may also埋下 structural risks. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group (hereinafter referred to as Qinglong) leverages its full-chain technical advantages to thoroughly analyze the causes of bubbles and provide systematic solutions, helping drive quality upgrades across the industry.

I. Analysis of the Underlying Logic of Bubble Formation in UHPC Components

The formation of surface bubbles in UHPC components results from the combined effects of material characteristics, process control, and environmental factors. From a material perspective, an imbalance between the fluidity of the cementitious material system and the air-entraining agent dosage can easily prevent bubbles from escaping smoothly. During production, excessive mixing speed entrapping too much air, improper mold surface treatment causing gas retention, or deviations in vibration process parameter settings can all directly trigger bubble problems. Through tracking research on more than a thousand projects nationwide, Qinglong's technical team found that when ambient temperature and humidity fluctuations exceed ±5℃, the bubble occurrence rate rises by 30% — data that provides an important basis for process optimization in the industry.

II. Full-Process Control: Qinglong's Four-Dimensional Solution for Bubble Prevention

As a national high-tech enterprise, Qinglong has pioneered a four-dimensional control system of “materials – process – equipment – testing” to solve the bubble problem at its source. In material development, it adopts a composite blending technology of nano-scale silica fume and ultra-fine steel fibers, optimizing slurry fluidity while reducing surface tension to keep bubble diameter within 0.3mm. In the manufacturing stage, German-imported vacuum mixing equipment and a three-dimensional vibration system are introduced, together with independently developed mold release agents, achieving a 40% improvement in bubble discharge efficiency. Notably, the BIM digital production management platform established by Qinglong can monitor pressure changes during component casting in real time, ensuring precise matching of vibration frequency and duration. This technology has been successfully applied in benchmark projects such as the Century Plaza renovation on Nanjing East Road.

III. Industry Collaboration: From Problem Solving to Standard Building

In response to industry-wide issues, Qinglong actively promotes technology sharing and standard development. As a major contributing unit of the industry standard “General Technical Conditions for Non-Load-Bearing UHPC (Ultra-High Performance Concrete) Components,” the company has incorporated bubble control indicators into its quality acceptance system, clearly stipulating that the bubble area on exposed components must not exceed 0.5% of the surface area. Meanwhile, Qinglong has joined forces with industry peers such as Guangdong Shiji Shangpin and Shantaixin Industrial to establish a UHPC production process database. By comparing bubble formation patterns under different mix ratios, the company has developed the “Technical Guidelines for Bubble Prevention and Control in UHPC Components,” providing replicable solutions for the industry.

From detailed design to after-sales maintenance, Qinglong upholds the mission of “creating beautiful architecture,” transforming 28 years of engineering experience into technical advantages. From the UHPC curtain walls of Malaysia's Twin Towers to the GRG ceilings of a major domestic grand theater, all have fulfilled the quality commitment of zero bubble detection. Looking ahead, Qinglong will continue to focus on innovation in UHPC/GRC/GRG/GRP materials, maintaining an attitude of “meticulousness and constant pursuit of excellence,” providing designers and owners with full-chain services from concept to completion, and steadily advancing toward the vision of “becoming a world-class leading enterprise in UHPC/GRC/GRG/GRP manufacturing.”