How to Mitigate UHPC Autogenous Shrinkage through Material Design: Mechanism Analysis and Optimization Strategies

In the field of contemporary architectural decoration, Ultra-High Performance Concrete (UHPC) has become the preferred material for landmark buildings, high-end commercial complexes and other applications thanks to its outstanding mechanical properties and design freedom. However, autogenous shrinkage, as a key bottleneck restricting the widespread application of UHPC, has long troubled designers and engineering parties. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group, drawing on practical experience accumulated in detailed design, manufacturing and construction installation, starts from the essence of the material to systematically analyze the autogenous shrinkage mechanism and propose optimization paths, providing the industry with solutions that are both professional and actionable.

I. The Core Mechanism of UHPC Autogenous Shrinkage: The Dual Role of Material Properties and Microstructure

UHPC autogenous shrinkage originates from its unique material composition and hydration process. Compared with ordinary concrete, UHPC achieves a highly densified matrix by incorporating active components such as ultra-fine silica fume and quartz sand, but this also makes the cement hydration reaction more intense and causes the internal relative humidity to drop rapidly, thereby triggering the superimposed effects of capillary tension and chemical shrinkage. Data from Qinglong Group's laboratory shows that the autogenous shrinkage of conventional UHPC can exceed 800με within 7 days of curing, easily leading to the risk of component cracking, and posing particular challenges to the structural stability of refined products such as large-span decorative panels and special-shaped curved components.

II. Material Design Optimization Strategies: From Component Regulation to Process Innovation

To tackle the challenge of autogenous shrinkage, Qinglong Group has built a trinity control system of "material-structure-process" based on the technical resources of its national-level R&D center and provincial-level engineering technology center. At the material level, by incorporating nano calcium carbonate and metakaolin in combination, the hydration rate of the cementitious system is optimized, reducing the early hydration heat peak by 15%-20%; the introduction of hybrid reinforcement technology using steel fibers and polyvinyl alcohol fibers not only improves the crack resistance of the material, but also relieves shrinkage stress through the fiber bridging effect. In terms of production technology, a segmented control method combining steam curing and constant temperature and humidity curing is adopted, keeping the autogenous shrinkage of UHPC components within 450με, reaching an industry-leading level.

III. Full-Chain Collaboration: Risk Prevention and Control from Detailed Design to After-Sales Maintenance

As a UHPC manufacturer integrating design, production and construction, Qinglong Group emphasizes a systematic approach to autogenous shrinkage control. In the detailed design stage, BIM technology is used to simulate shrinkage deformation under different environmental temperature and humidity conditions, allowing component joints and anchoring nodes to be optimized in advance; in the manufacturing stage, intelligent production lines with an annual capacity of 600,000 square meters enable precise mix proportion metering and standardized mixing processes; during construction and installation, 3D laser scanning positioning and modular assembly technology ensure on-site installation errors of ≤2mm, reducing structural stress concentration caused by later shrinkage. In addition, a well-established after-sales maintenance system provides long-term monitoring and maintenance support for projects, fully safeguarding the service life of UHPC components.

Autogenous shrinkage control is a key issue for UHPC materials moving from the laboratory to engineering applications. Built on 28 years of industry experience, Qinglong Group transforms technical challenges into product competitiveness through material innovation and full-chain collaboration. Looking ahead, with the advancement of industry standards such as the "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)", Qinglong will continue to deepen its expertise in the field of UHPC/GRC/GRG/GRP materials. Guided by the mission of "Creating Beautiful Architecture", the company is committed to providing designers and owners with more reliable and cost-effective high-end decorative material solutions, promoting the high-quality development of the new architectural decoration materials industry.