Hajiesmaeili A, Hafiz M A, Denarié E
Maintenance and Safety of Structures, Ecole Polytechnique Fédérale de Lausanne, Station 18, GC A3 398, 1015 Lausanne, Switzerland.
Mater Struct. 2021;54(3):114. doi: 10.1617/s11527-021-01621-0. Epub 2021 May 6.
PE-UHPFRC is a new Ultra High-Performance Fiber Reinforced Concrete (UHPFRC), which is developed to reduce the environmental impact of conventional UHPFRC by replacing the steel fibers with synthetic ones and reducing the clinker content in the mix. The development of the dynamic elastic modulus, the evolution of free autogenous deformations and the eigenstresses development with age, under full and partial restraint conditions, were investigated for PE-UHPFRC and the results were put into perspective with that for conventional UHPFRC with steel fibers. Furthermore, the tensile responses of different mixes under imposed shrinkage were compared and discussed. The results showed a shorter setting time and consequently an earlier initiation of elastic modulus development for PE-UHPFRC compared with that of conventional UHPFRC. Furthermore, the developed eigenstresses under full restraint conditions in a PE-UHPFRC layer compared with that for conventional UHPFRC were reduced by more than 70%, which is highly beneficial especially for cast-in-place rehabilitation applications.
聚乙烯超高性能纤维增强混凝土（PE-UHPFRC）是一种新型超高性能纤维增强混凝土（UHPFRC），它通过用合成纤维替代钢纤维并减少混合料中的熟料含量来降低传统UHPFRC对环境的影响。研究了PE-UHPFRC在完全和部分约束条件下动态弹性模量的发展、自由自生变形的演变以及特征应力随龄期的发展，并将结果与含钢纤维的传统UHPFRC的结果进行了对比。此外，还对不同混合料在强制收缩下的拉伸响应进行了比较和讨论。结果表明，与传统UHPFRC相比，PE-UHPFRC的凝结时间更短，因此弹性模量发展的起始时间更早。此外，与传统UHPFRC相比，PE-UHPFRC层在完全约束条件下产生的特征应力降低了70%以上，这对于现浇修复应用尤其有利。
