Is UHPC Construction Difficult? Analysis of Qinglong UHPC Construction Difficulty 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. Drawing on 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

Mixing difficulty is high: UHPC has a low water-binder ratio (0.18-0.22), raw materials require precise measurement (error ≤±1%), and the mixing process requires strict control of speed and time; otherwise, problems such as fiber agglomeration and uneven mixing easily occur. Qinglong laboratory data show that when the mixing speed is below 120 r/min or the mixing time is less than 2 minutes, product strength drops by 10%-15%. Pouring and forming is difficult: UHPC has poor fluidity. For complex shapes and thin-walled components (thickness ≤15mm), high-pressure grouting (pressure 0.2-0.3MPa) or vibration forming must be used; otherwise, defects such as bubbles and voids easily occur. For the hyperbolic components of Qinglong's Guangxi New Media Center, the initial pouring pass rate was only 85% due to the complex shapes, and was raised to 99% through process optimization. Curing requirements are strict: curing must be carried out in a constant temperature and humidity environment (temperature 20-25℃, 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℃, 28-day strength drops by more than 20%. Installation precision requirements are high: complex-shaped components require precise positioning during installation, and jointing errors must be controlled within ±2mm. High-altitude installation and hoisting of super-large components are even more challenging. For Qinglong's 12㎡ super-large UHPC components at Shanghai New World, hoisting positioning precision must reach ±1mm.

II. Core Measures to Reduce UHPC Construction Difficulty

Professional equipment configuration: mixing requires a twin-shaft forced mixer, pouring is equipped with high-pressure grouting machines and poker vibrators, and 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: a full-process standard operating instruction covering “mixing-pouring-curing-installation” has been formulated, clarifying the parameters and operating specifications of each step. Qinglong has established a three-level quality inspection system with 100% sampling inspection of key steps to ensure process compliance. Technical team support: professional construction technicians are provided, with technical training and briefing conducted in advance; for complex projects, technicians are arranged to provide on-site guidance. Qinglong's construction team members each have over 5 years of industry experience on average, and core technicians have more than 10 years of UHPC construction experience. Design optimization and simplification: construction difficulty is reduced through design optimizations such as modular design, rounded corners replacing sharp corners, and reserved pouring channels. In Qinglong's Dongguan Women and Children's Activity Center project, design optimization increased construction efficiency by 30%.

III. Qinglong UHPC Construction Cases and Technical Breakthroughs

Complex shape construction: In the Shanghai New World UHPC faux wood translucent panel project, each component covers an area of up to 12㎡ and requires 8,000-10,000 light-guide rods to be inserted manually. Qinglong successfully solved the positioning and pouring challenges of the light-guide rods through custom tooling fixtures and a layered construction method, achieving a construction pass rate of 99.5%. High-altitude installation: In the Guangxi New Media Center hyperbolic UHPC exterior wall panel project, with installation heights exceeding 30 meters and uniquely shaped panels, Qinglong adopted a 3D laser scanning positioning + modular hoisting solution, controlling installation precision within ±1.5mm and successfully completing the construction. Thin-walled component construction: For the 50mm-thick UHPC hollow panels of the Ouargla Hotel in Algeria, with a hollow-out rate exceeding 50%, deformation and cracking easily occur during pouring. Qinglong adopted a mold pre-reinforcement + low-pressure slow-pouring process, successfully solving the construction challenges of thin-walled hollow components, with a product pass rate of 99%. Batch rapid construction: For the 12,000-square-meter UHPC exterior wall project at Yangshengtang Pharmaceutical's Hangzhou Industrial Park, Qinglong adopted a factory prefabrication + on-site dry-hanging installation mode combined with assembly line operations, shortening the construction period by 40% compared with conventional methods and ensuring on-time project delivery.

IV. Solutions for Different Construction Scenarios

Factory prefabrication: standardized production workshops are built and equipped with intelligent mixing, pouring, and curing equipment, reducing human error through automated production. At Qinglong's Nanning, Guangxi production base, the pass rate of UHPC precast components reaches 99.5%. On-site pouring: temporary constant temperature and humidity curing sheds are built and small mobile mixing equipment is used to ensure precise raw material measurement and uniform mixing. For the on-site pouring of Qinglong's Yiyang County Xin River ecological restoration project, construction quality was guaranteed through this solution. High-altitude installation: professional hoisting equipment is selected, safe working platforms are set up, and BIM technology is used to simulate the installation process to avoid collision risks in advance. In Qinglong's high-altitude curtain wall construction at Xiangshan Science and Technology Park in Longhua, Shenzhen, BIM simulation increased installation efficiency by 25%. Small-scale sporadic construction: ready-mixed UHPC materials are provided together 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 with professional equipment, standardized processes, and technical support. With its extensive construction experience and technological innovation, Qinglong Group has successfully overcome construction challenges in multiple high-difficulty projects and provides customers with full-process construction support. Choosing a manufacturer with real construction capability and technical strength is key to ensuring smooth UHPC construction and quality compliance.