Abstract
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.
Highlights
The aging of transportation infrastructures together with the increasing demand of the society have intensified the need for effective and sustainable structural rehabilitation and strengthening techniques
The internal autogenous deformations are mainly due to chemical shrinkage, self-desiccation after setting, drying shrinkage and thermal effects caused by the heat of hydration in the new layer
PE-Ultra High-Performance Fiber Reinforced Concrete (UHPFRC) is a UHPFRC mix in which 50 vol% of the clinker is replaced with limestone fillers [14] and the steel fibers are replaced with Ultra High Molecular Weight Polyethylene (UHMW-PE) ones
Summary
The aging of transportation infrastructures together with the increasing demand of the society have intensified the need for effective and sustainable structural rehabilitation and strengthening techniques. Hafiz et al [13] studied the development of eigenstresses in UHPFRC under full restraint conditions and showed that these stresses could reach values higher than the elastic limit and even reach the tensile strain hardening domain of the material after one month at 20 °C curing. PE-UHPFRC is a UHPFRC mix in which 50 vol% of the clinker is replaced with limestone fillers [14] and the steel fibers are replaced with Ultra High Molecular Weight Polyethylene (UHMW-PE) ones This newly developed mix has equivalent or better properties (tensile strain hardening) than mixes realized with steel fibers, adapted for cast-in-place applications of reinforcement of existing structures (sort UA after [15]). The tensile responses of different UHPFRC mixes under imposed shrinkage deformations are put into perspective and the effect of the viscoelastic response on reducing the apparent elastic modulus of different mixes at very low loading rates is discussed
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