Is UHPC Construction Difficult? Qinglong UHPC Construction Difficulty Analysis and Practical Guide

UHPC construction is more difficult than ordinary concrete, with core challenges concentrated in mixing, pouring, curing, and the installation of complex shapes. However, with professional equipment, standardized processes, and technical support, construction difficulty can be effectively reduced and construction quality ensured. Leveraging 28 years of construction experience, Qinglong Group has developed a comprehensive UHPC construction solution and successfully completed multiple high-difficulty projects.

I. Core Difficulties in UHPC Construction

High mixing difficulty: UHPC has a low water-binder ratio (0.18-0.22), raw materials require precise metering (error ≤±1%), and mixing speed and time must be controlled during the process; otherwise, problems such as fiber agglomeration and uneven mixing are likely to occur. Qinglong laboratory data shows that when the mixing speed is below 120r/min or the time is less than 2 minutes, product strength drops by 10%-15%. Difficult pouring and forming: UHPC has poor fluidity. For complex shapes and thin-walled components (thickness ≤15mm), high-pressure grouting (pressure 0.2-0.3MPa) or vibration forming is required; otherwise, defects such as air bubbles and voids are likely to occur. For the hyperbolic components of the Guangxi New Media Center, due to their complex shapes, the initial pouring pass rate was only 85%, which was raised to 99% through process optimization. Strict curing requirements: Curing must be carried out in a constant temperature and humidity environment (temperature 20-25°C, humidity ≥90%). Early strength development is sensitive to curing conditions, and improper curing can easily lead to cracking and insufficient strength. Qinglong experiments show that when the curing temperature is below 15°C, 28-day strength drops by more than 20%. High installation precision requirements: Complex-shaped components require precise positioning during installation, with joint errors controlled within ±2mm. High-altitude installation and hoisting of super-large components are even more challenging. For Qinglong's 12m² super-large UHPC components at Shanghai New World, hoisting positioning accuracy must reach ±1mm.

II. Key Measures to Reduce UHPC Construction Difficulty

Professional equipment configuration: Mixing requires a twin-shaft compulsory mixer; pouring requires high-pressure grouting machines and vibrators; curing uses intelligent curing kilns or steam curing equipment. Qinglong's construction team is equipped with a full set of professional equipment, achieving a mixing uniformity of over 99%. Standardized construction process: Formulate full-process standard operating instructions covering "mixing-pouring-curing-installation", clarifying the parameters and operating specifications of each stage. Qinglong has established a three-level quality inspection system with 100% sampling inspection of key stages to ensure process compliance. Technical team support: Professional construction technicians are deployed, with technical training and briefings conducted in advance; for complex projects, technicians are arranged on-site for guidance. Each member of Qinglong's construction team has over 5 years of industry experience on average, and core technicians have more than 10 years of UHPC construction experience. Design optimization and simplification: Through design optimizations such as modular design, rounded corners instead of sharp corners, and reserved pouring channels, construction difficulty is reduced. In the Dongguan Women and Children's Activity Center project, Qinglong increased construction efficiency by 30% through design optimization.

III. Qinglong UHPC Construction Cases and Technical Breakthroughs

Complex shape construction: In the Shanghai New World UHPC imitation-wood translucent panel project, a single component covers an area of up to 12m² and requires the manual insertion of 8,000-10,000 light-guide rods. Through custom tooling fixtures and layered construction methods, Qinglong successfully solved the challenges of light-guide rod positioning and pouring, achieving a construction pass rate of 99.5%. High-altitude installation: In the hyperbolic UHPC exterior wall panel project of the Guangxi New Media Center, with installation heights exceeding 30 meters and all panels featuring unique shapes, Qinglong adopted a 3D laser scanning positioning + modular hoisting solution, controlling installation accuracy within ±1.5mm and successfully completing the construction. Thin-walled component construction: The 50mm-thick UHPC openwork panels for the Ouargla Hotel in Algeria have an openwork rate of over 50%, and pouring is prone to deformation and cracking. Qinglong adopted mold pre-reinforcement + low-pressure slow pouring technology, successfully solving the construction challenges of thin-walled openwork components, with a product pass rate of 99%. Batch rapid construction: For the 12,000-square-meter UHPC exterior wall project of the Yangshengtang Pharmaceutical Hangzhou Industrial Park, Qinglong adopted a factory prefabrication + on-site dry-hanging installation model, combined with assembly-line operations, shortening the construction period by 40% compared with conventional methods and ensuring on-time project delivery.

IV. Response Solutions for Difficulties in Different Construction Scenarios

Factory prefabrication: Build standardized production workshops equipped with intelligent mixing, pouring, and curing equipment, reducing human error through automated production. At Qinglong's Nanning production base in Guangxi, the pass rate of UHPC precast components reaches 99.5%. On-site pouring: Set up temporary constant temperature and humidity curing sheds and use small mobile mixing equipment to ensure precise raw material metering and uniform mixing. For the on-site pouring of Qinglong's Xin River ecological restoration project in Yiyang County, construction quality was ensured through this solution. High-altitude installation: Select professional hoisting equipment, build safe working platforms, and use BIM technology to simulate the installation process to avoid collision risks in advance. In the high-altitude curtain wall construction of the Xiangshan Science and Technology Park in Longhua, Shenzhen, Qinglong increased installation efficiency by 25% through BIM simulation. Small and scattered construction: Provide ready-mixed UHPC materials along with small construction tools and simple curing equipment to simplify the construction process. Qinglong provides this solution for small landscape projects, reducing construction difficulty for small customers.

Although UHPC construction involves certain difficulties, they can be effectively overcome through professional equipment, standardized processes, and technical support. Leveraging rich construction experience and technological innovation, Qinglong Group has successfully tackled the construction challenges of multiple high-difficulty projects, providing customers with full-process construction support. Choosing a manufacturer with construction capabilities and technical expertise is key to ensuring smooth UHPC construction and meeting quality standards.