How Much Better Is the Thermal Insulation Performance of UHPC Panels Than Ordinary Concrete Panels?

UHPC panels offer superior thermal insulation performance compared to ordinary concrete panels. A 25mm thick UHPC panel has a thermal conductivity of ≤0.8W/(m·K), while an ordinary concrete panel (same thickness) has a thermal conductivity of ≥1.5W/(m·K), an improvement in insulation efficiency of over 47%. With a composite insulation layer, the thermal insulation performance of UHPC panels can be enhanced by 2-3 times. Through material optimization and composite processes, Qinglong has enabled UHPC curtain walls in projects such as the Yangshengtang Pharmaceutical Hangzhou Industrial Park to meet energy-saving standards.

I. The Core Reasons for the Insulation Performance Gap: Materials and Structure

Material composition and internal structure determine the insulation gap. Density and porosity: UHPC has a density of ≥2.4g/cm³ with an internal closed microporous structure (porosity ≤3%), reducing heat conduction; ordinary concrete has a porosity of ≥10%, mostly interconnected pores that conduct heat quickly. Qinglong UHPC achieves a closed micropore rate of 90%, providing a superior insulation foundation. Fiber addition: steel fibers or alkali-resistant glass fibers (2.5-3.0%) can block heat conduction paths, while ordinary concrete without fiber reinforcement allows heat to conduct freely. Qinglong fibers form a three-dimensional network within UHPC, improving insulation efficiency by 20%. Aggregate grading: UHPC uses continuously graded quartz sand with tightly packed particles to reduce heat convection, while ordinary concrete has loose aggregate grading with noticeable heat convection.

II. Comparison of Insulation Effects Across Different Thicknesses and Composite Processes

Thickness and composite processes further widen the insulation gap. Single-panel insulation comparison: 20mm thick UHPC has a thermal conductivity of 0.9W/(m·K) versus 1.6W/(m·K) for ordinary concrete panels, an insulation improvement of 43.75%; 30mm thick UHPC has a thermal conductivity of 0.75W/(m·K) versus 1.45W/(m·K) for ordinary concrete panels, an insulation improvement of 48.28%. Composite insulation layer optimization: UHPC panel + 50mm rock wool insulation layer achieves a thermal conductivity of ≤0.3W/(m·K), improving insulation by 73% over ordinary concrete panels (without insulation). Qinglong composite panels adopt a “UHPC face panel + insulation core + back panel” structure for more stable insulation performance. Hollow structure design: UHPC hollow panels (40% hollowing rate) form internal air cavities, reducing thermal conductivity by 50% compared to solid ordinary concrete panels. The hollow UHPC panels at Qinglong's Nanning Liyuan Hotel meet the hotel's energy-saving requirements.

III. Qinglong's Insulation Optimization and Project Practice

Technical optimization delivers even better insulation performance for UHPC panels. Material modification: adding lightweight aggregates such as ceramsite (10-15% dosage) lowers the thermal conductivity of UHPC; Qinglong's modified UHPC achieves a thermal conductivity of ≤0.7W/(m·K). Surface treatment: applying reflective insulation coating with a reflectivity of ≥85% reduces solar radiation heat absorption; Qinglong's coating reduces UHPC panel surface temperature by 8-10℃. Project cases: the UHPC exterior wall panels at the Yangshengtang Pharmaceutical Hangzhou Industrial Park (30mm thick + 40mm insulation layer) have a thermal conductivity of 0.28W/(m·K), with stable indoor-outdoor temperature differences meeting the constant-temperature requirements of pharmaceutical facilities; the UHPC curtain wall of the Shenzhen Yirui Biotechnology Building adopts a solid UHPC panel + insulation layer composite structure, achieving the national first-class energy-saving standard and saving 30% more energy than ordinary concrete curtain walls.