Is the Shrinkage Rate of UHPC High? The Secret to Low Shrinkage Stability of Ultra-High Performance Concrete

"High Performance Can Also Mean Low Shrinkage? UHPC's Shrinkage Control Rewrites Concrete Application Perceptions"

Shrinkage cracking is a common quality problem in construction projects, and shrinkage rate is a key indicator for measuring material stability. Ultra-high performance concrete (UHPC), as a new building material with outstanding performance, achieves low shrinkage characteristics while ensuring high strength and high durability, solving the pain point of shrinkage cracking in traditional concrete. Qinglong Group, with 28 years of full-chain experience, has given full play to the low-shrinkage advantages of UHPC through technological R&D and project practice.

I. Core Performance of UHPC Shrinkage Rate: Stability Far Outperforming Traditional Concrete

The shrinkage rate of UHPC is significantly lower than that of ordinary concrete and conventional high-performance concrete, demonstrating exceptional volume stability.

In terms of drying shrinkage rate, ordinary concrete typically has a drying shrinkage rate between 400-600×10⁻⁶, while the drying shrinkage rate of UHPC can be controlled below 200×10⁻⁶, with some optimized-formula products even lower. This means that UHPC undergoes minimal volume change during hydration hardening and service, greatly reducing the risk of shrinkage cracking.

Autogenous shrinkage control is another major advantage of UHPC. Traditional concrete develops autogenous shrinkage during hydration due to water consumption, which easily leads to internal cracks, whereas UHPC effectively suppresses autogenous shrinkage by optimizing the water-binder ratio and incorporating active admixtures. Experimental data from Qinglong Group shows that the autogenous shrinkage rate of its UHPC products is far below the industry average, maintaining volume stability during hardening and avoiding internal micro-cracks.

In addition, UHPC shrinkage is characterized by early stability. The shrinkage process of ordinary concrete lasts a long time, while the shrinkage rate of UHPC slows down significantly in the later curing stage, quickly reaching a volume-stable state and reducing structural risks caused by long-term shrinkage. This characteristic allows UHPC to be used in engineering applications without complex shrinkage compensation measures, simplifying the construction process.

II. How UHPC Achieves Low Shrinkage: Synergistic Optimization of Materials, Formulation, and Process

The low-shrinkage characteristics of UHPC are the result of synergistic optimization of material selection, formulation design, and production processes, reflecting an advanced building material R&D philosophy.

In terms of material selection, UHPC uses high-purity, low-impurity quality raw materials, reducing shrinkage instability caused by fluctuations in raw material quality. The precise selection of aggregates such as quartz sand and ultra-fine active powders not only improves material density but also reduces porosity through optimized particle grading, thereby reducing the space for drying shrinkage. Qinglong Group has established a strict raw material screening mechanism to ensure that every batch of raw materials meets the requirements of low-shrinkage formulations.

Formulation design is the core of shrinkage rate control. UHPC adopts a low water-binder ratio formula, reducing free water content and lowering the possibility of drying shrinkage at the source. At the same time, appropriate amounts of expansive agents and active admixtures are incorporated to produce a micro-expansion effect through hydration reactions, offsetting part of the shrinkage stress. After years of testing, Qinglong Group's R&D team has developed a low-shrinkage formulation system for different engineering scenarios, which can be precisely adjusted according to project requirements to achieve optimal shrinkage rate control.

Refined production processes also provide a guarantee for low shrinkage. Qinglong Group's automated production lines can precisely control mixing time, molding pressure, and curing temperature, ensuring a uniform and dense internal structure of UHPC and avoiding uneven local shrinkage caused by process defects. In particular, the application of high-temperature steam curing accelerates the full progress of hydration reactions, allowing the material to form a stable internal structure at an early stage and reducing later-stage shrinkage.

III. Engineering Application Value: Practical Demonstration of Qinglong UHPC's Low-Shrinkage Advantages

The low-shrinkage characteristics of UHPC have significant value in actual engineering, and multiple benchmark projects of Qinglong Group fully demonstrate this advantage.

In the Shenzhen Yirui Biotechnology Building project, the UHPC curtain wall decorative panels provided by Qinglong Group include flat panels, L-shaped panels, U-shaped panels, inclined panels, and other types, with an applied area of several thousand square meters. As a major industrial investment project in Shenzhen, this project placed extremely high demands on the flatness and stability of the building facade. Thanks to UHPC's low shrinkage rate, no shrinkage cracking, deformation, or other problems occurred after installation, ensuring the sealing performance and aesthetics of the curtain wall and achieving long-term stable performance.

In the Shanghai Qingpu R&D and Production project, Qinglong Group's UHPC components are applied to the architectural decoration of a high-tech R&D base. The project placed stringent requirements on material stability and durability; UHPC's low-shrinkage characteristics effectively prevented cracks caused by shrinkage during the components' use, safeguarding the building's structural safety and decorative effect. At the same time, the low-shrinkage characteristic also reduced later maintenance costs and improved the project's overall benefits.

In multiple large-span, large-area UHPC application projects, Qinglong Group's products have exhibited no quality problems such as shrinkage cracking, and their low-shrinkage advantage has been unanimously recognized by owners, designers, and contractors. This fully proves UHPC's outstanding performance in controlling shrinkage rate and provides an effective solution to the problem of shrinkage cracking in traditional concrete.

With its low-shrinkage characteristics, UHPC has broken the inherent perception that "high performance necessarily means high shrinkage," providing a stable and reliable material choice for construction projects. With 28 years of industry experience, strong R&D capabilities, refined production control, and practical validation from numerous benchmark projects, Qinglong Group has become a quality supplier of low-shrinkage UHPC products. Whether for intricately shaped decorative components or large-area building curtain walls, choosing Qinglong UHPC delivers high-performance materials with stable volume and strong crack resistance, providing solid assurance for the long-term safety and aesthetics of buildings.