What Surface Acid Pickling Treatment Can Achieve on UHPC Panels and Its Impact on Performance

In the field of building materials, surface treatment technology is a key link in enhancing material performance and aesthetics. For UHPC (Ultra-High Performance Concrete), a cutting-edge material with ultra-high strength and durability, acid pickling treatment is like dressing it in "invisible armor"—it not only gives the surface a unique textural aesthetic but also deeply optimizes material performance. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group will analyze how the acid pickling process empowers UHPC panels from the dual perspectives of materials science and engineering practice.

Core Mechanism of Acid Pickling Treatment for UHPC Panels

The acid pickling treatment of UHPC panels is not simply surface cleaning; rather, it involves a controlled chemical reaction between an acid solution of a specific concentration and the concrete surface layer, selectively dissolving components such as calcium hydroxide in the cement paste. This process forms a 0.1-0.3mm microporous structure on the material surface, like building a "breathing skin" for the panels. Qinglong Group's laboratory data shows that the surface porosity of UHPC panels treated with optimized processes can increase by 12%-18%. This structure not only enhances coating adhesion but also regulates surface humidity through capillary action, demonstrating excellent anti-efflorescence capability in humid environments.

Multi-Dimensional Performance Enhancements of UHPC Through the Acid Pickling Process

In terms of mechanical performance, acid pickling treatment eliminates weak interfaces in the surface layer, increasing the surface hardness of UHPC panels by 8%-15% while reducing the surface elastic modulus by 3%-5%, forming a more resilient surface structure. In the Nanjing East Road Century Plaza renovation project that Qinglong participated in, the impact resistance of acid-pickled UHPC translucent panels improved by 22% compared to untreated panels, successfully withstanding long-term dynamic loads in high-traffic areas. In terms of durability, the microscopic texture formed by acid pickling can effectively retard chloride ion penetration. After 500 freeze-thaw cycle tests, the mass loss rate of treated panels was only 0.8%, far below the industry standard limit of 3%.

Expanded Aesthetic Expression and Application Scenarios

The acid pickling process brings rich decorative possibilities to UHPC panels. By adjusting the acid concentration and treatment time, a variety of textural effects can be achieved, from fine matte to three-dimensional lychee finish. In the Dongguan Women and Children's Activity Center project, Qinglong adopted gradient acid pickling technology, giving the UHPC facade panels a gradient color effect that changes with the angle of light, perfectly interpreting the concept that "architecture is frozen art." This process is particularly suitable for the skin design of high-end buildings such as grand theaters and museums, showcasing the rustic beauty of fair-faced concrete while using coloring treatment to simulate various material effects such as stone and metal, achieving unlimited extension of design creativity.

Process Optimization and Quality Control from a Full-Chain Perspective

As a national high-tech enterprise integrating detailed design, manufacturing, construction, and installation, Qinglong Group has established a full-process quality control system for the acid pickling process. From raw material gradation optimization (such as controlling silica fume content within the 15%-20% range), to precise control of acid solution temperature (±2°C), to pH value testing after neutralization treatment (required to reach 6.5-7.5), digital management modules are embedded in every step. This rigorous approach ensures the stable performance of acid-pickled UHPC panels in real estate projects such as Poly and China Overseas, and also confirms Qinglong's quality commitment of "meticulousness and the relentless pursuit of excellence."

The application of acid pickling treatment technology demonstrates the infinite possibilities of UHPC materials in both performance and aesthetics. Qinglong Group will continue to rely on 28 years of technological accumulation and the innovation capabilities of its national-level R&D center to drive the iterative upgrading of UHPC surface treatment processes, providing designers and owners with material solutions that combine structural safety with visual expressiveness. Driven by the mission of "creating beautiful architecture," every UHPC panel becomes a perfect fusion of architectural art and engineering technology.