Fire Performance of Sustainable 3D-Printed Ultra-High-Performance Concrete with Recycled and Natural Materials

3D打印混凝土引起了越来越多的关注，因为它们可以大大提高施工效率，而它往往存在延性和钢筋供应问题。超高性能混凝土（UHPC）的使用可以解决这些问题。但是，这种3D打印的UHPC的嵌入碳非常高，因此迫切需要降低它。此外，从未研究过3D打印的UHPC与绿色组件的火灾剥落性能。该项目将研究绿色3D打印的UHPC与水泥替代材料，再生骨料和替代纤维的火灾剥落行为。研究了热致剥落的机理和减轻剥落的措施。这项工作还将通过开发热诱导剥落的预测模型来补充，并为拟议的混凝土提供设计指导。

3D printing concrete has drawn increasing attention as they can substantially enhance the efficiency of construction, whereas it tends to have issues with ductility and re-bar provision. The use of UltraHigh-Performance Concrete (UHPC) can resolve these problems. But still, the embeddedcarbon of such 3D printed UHPC is very high and so there is an urgent need to lower it. In addition, the fire spalling performance of 3D printed UHPC with greener components has never been studied.This project will investigate the fire spalling behaviour of greener 3D printed UHPC with cement replacement materials, recycled aggregates and alternative fibres. The mechanisms of heat-induced spalling and mitigation measures will be studied. The work will also be complemented bythe development of a predictive model for heat-induced spalling and to produce design guidance for the proposed concrete.