Analysis of Causes and Solutions for Air Bubbles on UHPC Component Surfaces

The Engineering Philosophy Behind Millimeter-Scale Flaws: 28 Years of Technical Expertise in UHPC Component Bubble Control

In the field of contemporary architectural decoration, UHPC (Ultra-High Performance Concrete) has become the material of choice for high-end buildings such as grand theaters and commercial complexes, thanks to its outstanding mechanical properties and artistic expressiveness. However, air bubbles on component surfaces, a common quality issue, not only compromise the aesthetic presentation of a building but may also lay hidden structural risks. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has drawn on thousands of real-world project cases to deeply analyze the underlying logic of bubble formation and build a full-process solution covering everything from material R&D to construction control.

I. Analysis of the Five Core Causes of UHPC Bubble Formation

The unique nature of UHPC material determines the complexity of its bubble control. Laboratory data from the Nanning production base show that imbalanced raw material ratios are the primary cause of bubble formation—when the mass ratio of silica fume to cement deviates from the golden range of 1:3.5, slurry fluidity drops by 30% and the resistance to bubble escape increases significantly. Mixing process parameters are equally critical: a rotation speed below 1200 r/min or a mixing time of less than 90 seconds leads to uneven fiber dispersion and the formation of localized bubble accumulation zones. Notably, the precision of mold surface treatment has a significant impact on bubble generation; when the release agent coating thickness exceeds 8 μm, the bubble retention rate rises by 40%—a finding validated in the translucent concrete project of Century Plaza on Nanjing East Road.

II. Building a Full-Chain Bubble Control Technology System

To address the bubble problem, Qinglong has established a trinity control system of "material–process–equipment." At the material level, its independently developed nano-scale defoamer keeps bubble diameters within 0.3 mm; certified by the Guangdong Provincial Building Materials Testing Center, its defoaming efficiency is 27% higher than the industry average. In production, vacuum mixing equipment imported from Germany is used in conjunction with a three-dimensional vibrating table (frequency adjustable from 50–60 Hz), achieving a component compaction degree of 99.8%. During the construction and installation phase, BIM technology is innovatively applied for pre-assembly simulation, and pouring paths are optimized through parametric design, achieving an industry benchmark of a bubble defect rate below 0.5 per square meter in the Dongguan Women and Children's Activity Center project.

III. The Advantages of Qinglong's Solutions Built on 28 Years of Technical Expertise

As a national high-tech enterprise, Qinglong integrates bubble control technology into full life-cycle management. Leveraging its provincial engineering technology center, the company has developed an online bubble monitoring system capable of capturing micro-bubbles at the 0.1 mm level in real time and automatically adjusting production parameters. In after-sales maintenance, its original nano-scale repair process eliminates bubble marks without affecting the surface texture of UHPC; this technology has been applied in the podium renovation project of the Malaysia Twin Towers. The company participated in formulating the General Technical Conditions for Non-Load-Bearing Ultra-High Performance Concrete (UHPC) Components, which incorporates bubble control indicators into industry standards, driving quality upgrades across the entire UHPC industry.

From the micro-level control of materials science to the macro-level management of engineering practice, UHPC bubble control is the best embodiment of Qinglong's corporate motto of "meticulousness and the constant pursuit of excellence." With its full-chain technical advantages, Qinglong Group not only provides designers with a reliable medium for realizing their creative ideas, but also creates architectural works for owners that combine aesthetic value with structural safety. Today, as UHPC materials are increasingly widely applied, controlling bubbles—a seemingly minor detail—is precisely an important yardstick for measuring a company's technical strength, and the core competitiveness that makes Qinglong another pole of the industry.