How Much Gap Width Should Be Reserved When Splicing UHPC Panels: Specific Standards and Construction Recommendations Explained

Millimeter-Level Precision Control for Perfect UHPC Panel Jointing — Qinglong's 28 Years of Industry Experience Give You the Standard Answer

In the field of contemporary architectural decoration, UHPC (Ultra-High Performance Concrete) has become the material of choice for high-end projects such as landmark buildings and commercial complexes, thanks to its outstanding mechanical performance and artistic expressiveness. As a national high-tech enterprise integrating detailed design, manufacturing, and construction installation, Qinglong Group, with 28 years of full-chain experience in UHPC/GRC/GRG/GRP, deeply understands the decisive impact of joint gap width on project quality. This article systematically analyzes the reserved standards and construction key points for UHPC panel joint gaps, providing designers and owners with professional solutions that stand the test of practice.

### Scientific Reserved Standards for UHPC Panel Joint Gaps: From Material Properties to Industry Standards

UHPC material features an ultra-low shrinkage rate (typically ≤0.03%) and excellent durability, but thermal deformation and load effects may still cause panel displacement. According to the "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)" (Plan No. 2024-0232T-JC), which Qinglong participated in formulating, and engineering practice data, **the standard joint gap width should be controlled at 3-5mm**. This parameter not only provides deformation allowance for thermal expansion and contraction, but also enables waterproofing and aesthetics through specialized sealing materials. For large panels with spans exceeding 6 meters or in regions with significant temperature differences, it is recommended to introduce BIM simulation at the structural design stage and, if necessary, adjust the gap width to 5-8mm to ensure long-term stability.

### Three Core Factors Affecting Gap Reservation: Qinglong's Full-Chain Experience Summary

As a leading UHPC manufacturer in China by scale, Qinglong establishes a multi-dimensional evaluation system at the detailed design stage: **First, substrate characteristics** — the fiber content and curing process of UHPC directly affect the shrinkage value, and Qinglong's autoclave curing technology keeps the 28-day shrinkage rate within 0.025%; **Second, installation environment** — outdoor projects need to account for annual temperature differences; for example, gaps in cold northern regions need to be increased by 1-2mm; **Third, structural form** — the gap calculation models for dry-hanging systems and support-style installation differ significantly, and Qinglong's patented "flexible anchoring joint" can absorb displacement of ±3mm. These technical details are precisely the quality assurance behind Qinglong's benchmark projects such as the light-transmitting concrete project at Century Plaza on Nanjing East Road.

### Key Points of Gap Control During Construction: Refined Management from Measurement to Sealing

Qinglong's construction team follows the "three-line control method" to ensure gap precision: baseline positioning uses 3D laser scanning with errors controlled within ±1mm; during installation, custom adjustment shims are used to fine-tune panel positions; for sealing, Qinglong's exclusive low-modulus silicone sealant is selected, with a movement capability of ±25%, capable of withstanding long-term temperature cycles. Notably, gap cleaning requires high-pressure air blowing before sealing, a step that directly affects waterproofing performance — Qinglong achieved a zero-leakage record in the Dongguan Women and Children's Activity Center project through this process.

### Qinglong's Full-Chain Service: Closed-Loop Support from Design Optimization to After-Sales Maintenance

As a national specialized, refined, distinctive, and innovative enterprise, Qinglong provides not only UHPC products but also technical solutions spanning the entire project lifecycle. In the early stage, panel jointing schemes are optimized through parametric design; the production stage uses automated assembly lines to ensure panel dimensional accuracy; construction is equipped with a professional certified installation team; and after-sales service includes a maintenance commitment of up to 15 years. This integrated "design-production-installation-maintenance" service is precisely the core advantage that has made Qinglong a strategic partner of real estate groups such as Poly and Vanke.

The gap reservation for UHPC panels may seem minor, but it is in fact a comprehensive embodiment of materials science, structural mechanics, and construction techniques. Qinglong Group has been deeply engaged in the UHPC/GRC/GRG/GRP field for 28 years, always controlling every millimeter-level detail with a "meticulous and excellence-pursuing" attitude. For project-specific gap solutions, please follow Qinglong's official channels and let our professional team safeguard your architectural aesthetics.