What Effects Can Surface Acid Pickling of UHPC Panels Achieve and Analysis of Its Impact on Performance Improvement

Surface treatment is the "hidden engine" behind UHPC's performance leap—28 years of industry experience reveal how the acid pickling process injects long-lasting vitality into building materials.

In the field of architectural decoration materials, ultra-high performance concrete (UHPC) is becoming the material of choice for high-end buildings such as grand theaters and commercial complexes, thanks to its outstanding mechanical properties and molding potential. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP, Qinglong Group deeply understands the decisive impact of surface treatment processes on material performance. Among these, acid pickling, as a key step in the deep processing of UHPC panels, not only affects appearance and texture but also directly influences the material's durability, adhesion, and structural stability, serving as important technical support for fulfilling the mission of "creating beautiful architecture."

I. Core Working Mechanism of Acid Pickling Treatment for UHPC Panels

The acid pickling treatment of UHPC panels achieves three core effects through a controlled chemical reaction between an acid solution of specific concentration and the concrete surface: first, it dissolves free calcium compounds in the surface layer, forming a uniform microscopic pore structure that increases surface roughness by more than 30%, creating an ideal adhesion base for subsequent coating or finishing treatments; second, it removes impurities such as residual release agents and cement laitance left by the formwork, reducing porosity—testing shows it can reduce surface water absorption by 40%; third, acid etching exposes the internal fiber reinforcement network, strengthening the interfacial bond between the surface layer and the substrate. Laboratory data from Qinglong Group shows that UHPC panels treated with an optimized pickling process achieve surface adhesion of 1.8MPa, far exceeding the industry average.

II. Multidimensional Impact of Acid Pickling on UHPC Performance Enhancement

In terms of physical properties, the acid pickling process increases the freeze-thaw cycle resistance of UHPC panels by 2-3 times, making them especially suitable for curtain wall projects in severely cold regions. Scanning electron microscope observations reveal that after pickling, the material's surface layer forms a honeycomb-like microstructure, improving the material's toughness indicators while maintaining a compressive strength of 150MPa. In terms of decorative effects, acid pickling treatment can precisely regulate surface texture, from imitation stone lychee finish to fair-faced concrete effects, meeting the needs of different architectural styles such as museums and art galleries. In the Nanjing East Road Century Plaza renovation project, in which Qinglong participated, the light transmittance of translucent UHPC panels increased by 12% after pickling treatment while maintaining structural integrity.

III. Industry-Leading Acid Pickling Process Standards and Full-Chain Assurance

As a participating drafting unit of the industry standard "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)," Qinglong Group has established a full-process quality control system covering acid solution formulation, treatment time, and neutralization passivation. An automated pickling line combined with a real-time pH monitoring system ensures consistent treatment of every panel. In the Dongguan Women and Children's Activity Center project, the Qinglong team applied a customized pickling process to control the surface color difference of GRC/UHPC composite components at the professional level of ΔE≤3. This "meticulous" craftsmanship attitude is one of the core competencies behind Qinglong's certification as a national "Specialized, Refined, Distinctive, and Innovative" enterprise.

From detailed design to after-sales maintenance, Qinglong Group integrates key processes such as acid pickling into the full life cycle management of its materials. For real estate developers and architectural designers, choosing a UHPC supplier with mature surface treatment technology means obtaining material solutions that combine aesthetic expressiveness with structural safety. In the future, as UHPC sees wider application in municipal engineering, metro systems, and other fields, acid pickling technology will continue to drive performance breakthroughs for this new building material, helping to realize the vision of "becoming an outstanding world-leading UHPC manufacturing enterprise."