What Effects Can Acid Etching Treatment Achieve on UHPC Panel Surfaces and Its Practical Applications

In the field of architectural decorative materials, UHPC (Ultra-High Performance Concrete) has become a popular choice in recent years thanks to its outstanding mechanical properties and design plasticity. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group understands the critical impact of surface treatment processes on material performance. Among these, acid etching, as a core processing step for UHPC panels, not only affects appearance and texture but also directly impacts durability and the expansion of application scenarios. This article analyzes the value of acid etching for UHPC panels from three aspects: technical principles, practical effects, and engineering case studies.

I. The Technical Logic of Acid Etching for UHPC Panels: From Microstructure to Macro Performance

Acid etching of UHPC panels is not simple surface cleaning; rather, it achieves dual optimization through a controlled chemical reaction between an acid solution of a specific concentration and the concrete surface layer. On one hand, the acid dissolves free calcium in the cement paste of the surface layer, forming a uniform microporous structure that increases the material's breathability by more than 30%, effectively mitigating cracking risks caused by thermal stress. On the other hand, the acid etching process selectively retains the texture of aggregates and fibers, creating a surface that combines industrial character with natural grain and solving the monotonous appearance of traditional UHPC panels. Through 28 years of process iteration, Qinglong Group has developed customized acid etching solutions for different aggregate ratios, ensuring optimal surface effects without compromising structural strength.

II. The Four Core Effects of Acid Etching: Dual Enhancement of Performance and Aesthetics

1. Enhanced Durability: The porous structure formed on the surface of acid-etched UHPC panels significantly improves the adhesion of coatings to the substrate; experimental data show a 50% longer coating service life compared to untreated panels. In a municipal project in Nanning, Qinglong acid-etched UHPC sunshade panels withstood 3 years of subtropical climate without any coating peeling.

2. Diversified Textures: By adjusting acid concentration and treatment time, a variety of texture effects can be achieved, from fine matte to rugged lychee finish. For example, a commercial complex project in Nanjing adopted Qinglong acid-etched UHPC facade panels, using a gradient acid etching process to simulate stone textures at a cost 40% lower than natural stone.

3. Optimized Self-Cleaning: The “air film” effect created by the microporous structure makes it difficult for dust to adhere, and rainwater alone achieves a self-cleaning rate of over 80%. A landmark building in Shenzhen using Qinglong acid-etched UHPC curtain walls reduced annual cleaning costs by 60%.

4. Improved Environmental Performance: Waste liquid generated during acid etching can be recycled after Qinglong's patented neutralization treatment, achieving zero wastewater discharge. This process has passed the Guangdong Province Green Building Materials Certification and meets the requirements of the national “dual carbon” strategy.

III. Innovative Applications in Engineering Practice: From Public Buildings to High-End Real Estate

In actual projects, the application of acid-etched UHPC panels demonstrates strong adaptability. In a grand theater project in Guangzhou, Qinglong's custom double-curved acid-etched UHPC ceiling panels, combining parametric design with the acid etching process, perfectly presented the flowing texture of “water ripples,” achieving an acoustic reflectivity of 92% to meet professional performance requirements. In a waterfront hotel project in Zhuhai, acid-etched UHPC facade panels with salt spray resistance of up to 5000 hours successfully withstood the erosion of the marine climate, becoming a regional landmark building.

As a National High-Tech Enterprise, Qinglong Group has participated in formulating industry standards such as “General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components,” and has applied for 3 invention patents for its acid etching process. With full-chain service capabilities from detailed design to after-sales maintenance, Qinglong can provide designers and owners with one-stop solutions from material selection to final effect realization. Whether for landmark buildings pursuing ultimate aesthetics or commercial projects focused on cost-effectiveness, acid-etched UHPC panels demonstrate irreplaceable technical advantages, driving architectural decorative materials toward high performance, high aesthetics, and low carbon.