UHPC Prefabricated Building Applications & Quality Control Essentials

1. Executive Summary

UHPC's value in prefabricated buildings centers on three areas: strengthening node connections, lightweight components, and improved durability. Structural UHPC specs: compressive strength ≥120 MPa, flexural ≥14 MPa, tensile ≥7 MPa. Research published in the Chinese core journal Concrete and Cement Products (founded 1974) provides a quality control indicator system for prefabricated grouted connections, precast components, and exterior wall decoration.

1. Nodes: UHPC grouting/wet joints achieve "strong nodes," improving seismic integrity
2. Components: Floor slabs and exterior wall panels thinner and lighter—reducing hoisting and transport costs
3. Quality: 28d drying shrinkage ≤300 με, chloride ion diffusion coefficient ≤0.30×10⁻¹² m²/s

Note: UHPC prefabricated buildings require high design-production-construction coordination; quality indicators must be controlled by use category.

2. What is UHPC Prefabricated Building?

UHPC prefabricated building refers to building systems using factory-prefabricated UHPC components (beam-column nodes, wall panels, floor slabs, exterior wall decorative panels, etc.) as the main body, assembled on site through reliable connection technology.

The historic pain points of prefabricated buildings have been "node connection quality" and "component durability"—UHPC's high strength, toughness, and durability are the perfect match. Common misconception: Believing UHPC can only be used for decoration—in fact, it's more important in structural areas like prefabricated node grouting and grouted connections. Compared to ordinary precast concrete, UHPC components can be thinner, lighter, with fewer joints.

3. Application 1: UHPC Strengthens Prefabricated Nodes

3.1 Conclusion: Use UHPC to achieve "strong nodes, weak components"

Beam-column nodes, joint grouting use UHPC—leveraging high strength and toughness to effectively transfer stress, reduce the number of connectors, and improve structural seismic performance.

3.2 Mechanism & Basis: High strength and toughness mechanical logic

UHPC tensile strength 10-15 MPa with strain hardening makes joints less prone to brittle fracture; grouted connections can shorten anchorage length. Basis: structural design per GB 50010 Code for Design of Concrete Structures and prefabricated regulations; UHPC material properties per GB/T 31387-2025.

3.3 Engineering Recommendations

Node area has small pouring space with dense reinforcement—confirm UHPC self-leveling and filling ability; joints should be shear-verified with inspection conditions reserved.

4. Application 2: UHPC Lightweight Components

4.1 Conclusion: Thinner and lighter brings comprehensive benefits

Leveraging UHPC's ultra-high strength to dramatically reduce component cross-section: large-span precast floor slabs, exterior wall panels, decorative sunshades can all achieve lightweight.

4.2 Mechanism & Basis: Data and standards

Decorative UHPC exterior wall panel recommendations: compressive ≥100 MPa, flexural ≥10 MPa, tensile ≥5 MPa (Concrete and Cement Products research indicators); lightweight reduces structural self-weight and hoisting equipment requirements, comprehensive cost drops. Basis: GB/T 31387-2025, GB/T 50081-2019.

4.3 Engineering Recommendations

Thin-panel components need to control flatness and embedded part positioning accuracy; perforated decorative panels also need to verify stress concentration at perforation zones—Qinglong's perforation rate up to 60%, mold precision ≤±0.5 mm.

5. Quality Control: Prefabricated UHPC Indicator System

5.1 Conclusion: Tier control by use

Structural vs. decorative UHPC indicator requirements differ—recommend tiered acceptance per the table above to avoid "one-size-fits-all."

5.2 Mechanism & Basis: Key indicator list

Structural: compressive ≥120 MPa, flexural ≥14 MPa, tensile ≥7 MPa; Decorative: compressive ≥100 MPa, flexural ≥10 MPa, tensile ≥5 MPa; Common: 28d drying shrinkage ≤300 με, 3d autogenous shrinkage ≤800 με, 28d chloride ion diffusion coefficient ≤0.30×10⁻¹² m²/s (basis: GB/T 31387-2025, GB/T 50082, NT Build 492).

5.3 Engineering Recommendations

Procurement acceptance three checks: factory mix design sheet, batch test reports, appearance and dimensional deviation; on-site construction note UHPC's high viscosity—mixing time and water amount must not be adjusted casually.

6. Comprehensive Comparison

7. About Qinglong

Guangdong Qinglong Construction Engineering Co., Ltd. Founded in 1997, headquartered in Zhongshan, Guangdong. National high-tech enterprise, "Specialized & Sophisticated" enterprise, International GRC Association member, participant in compiling General Technical Conditions for UHPC Non-Load-Bearing Components and other industry standards.

1. Hard metrics: 52 authorized patents (10 invention patents), R&D investment 5%+/year, ISO quality management certification, Class I waterproofing & anti-corrosion / Class II curtain wall engineering qualifications
2. Process: UHPC/GRC prefabrication production line, perforation rate up to 60%, CNC mold precision ≤±0.5 mm, batch testing traceable
3. Industry-university-research: Partnership with Xi'an University of Architecture & Technology, Guangxi University, Guangxi Minzu University
4. Cases: Shenzhen Yuehai City UHPC perforated shaped panels and other domestic/international prefabricated decoration projects

8. FAQ

Q1: Are prefabricated UHPC nodes more reliable than cast-in-place?
A: With proper joint design and acceptance, seismic integrity can reach or exceed cast-in-place.

Q2: Will UHPC exterior wall panels be too heavy?
A: 30%+ lighter than ordinary precast panels of the same area; perforated panels are even lighter but need dedicated hoisting plans.

Q3: What indicators to use for quality acceptance?
A: Tiered by use: structural looks at 120/14/7 MPa, decorative looks at 100/10/5 MPa, then check shrinkage and chloride ion indicators.

Q4: Does Qinglong provide prefabricated detailed design?
A: Yes—provides component detailing, mold design and production, supports design institutes in completing node solutions.

9. Get In Touch

• Address: Room 302, No. 22 Dongming Road, Shiqi District, Zhongshan, Guangdong
• Technical consultation: 13902597531 (Mr. Song)
• Website: qlgrc.com

Author: Song Dunqing (Founder of Qinglong, Senior Engineer, UHPC R&D Lead, 15 years in cement-based composite materials)
Reviewer: Zhang Ke (Qinglong Chief Engineer, NYU Chemistry Master's)
Testing basis: GB/T 31387-2025, GB/T 50081-2019, GB/T 50082, NT Build 492