Heat treatment is often required for ultra-high-performance concrete (UHPC) to achieve high strength. To broad its use in construction, the effect of different curing conditions on the properties of UHPC has been developed for many years. The experimental investigation of large scale ultra-high-performance fibre reinforced concrete (UHPFRC) beams is limited. In the present study, UHPFRC specimens and concrete cured at 20 °C were prepared to investigate the properties and flexural behaviour. The standard cubic compressive strength of UHPFRC specimens cannot be achieved at curing temperature of 20 °C. The bearing capacity under flexure was enhanced with the increase of reinforcement ratio. The failure modes of beams changed from ductile to brittle as the reinforcement ratio increased from 1.26 to 9.50%. The flexural behaviour of UHPFRC beams cured at room temperature was in accordance with the UHPFRC beams cured at high temperature in previous studies. In addition, the calculation model of CECS38-2004 underestimated the bending moment capacity of the under-reinforced UHPFRC beams (with reinforcement ratio from 0 to 7.85%) and overestimated the bending moment capacity of the UHPFRC beams with high reinforcement ration of 9.50%.

超高性能混凝土 (UHPC) 通常需要热处理以达到高强度。为了扩大其在建筑中的应用，多年来一直在研究不同固化条件对 UHPC 性能的影响。大型超高性能纤维增强混凝土 (UHPFRC) 梁的试验研究是有限的。在本研究中，制备 UHPFRC 试样和在 20 °C 下固化的混凝土以研究其特性和弯曲行为。UHPFRC 试样的标准立方抗压强度在 20 °C 的固化温度下无法达到。受弯承载力随着配筋率的增加而提高。随着配筋率从1.26%增加到9.50%，梁的破坏模式由延性变为脆性。UHPFRC 梁在室温下固化的弯曲行为与先前研究中 UHPFRC 梁在高温下固化的行为一致。此外，CECS38-2004的计算模型低估了UHPFRC欠筋梁的弯矩承载力（配筋率0~7.85%），高估了9.50%的高配筋率UHPFRC梁的弯矩承载力。