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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.
A. Hajiesmaeili; M. A. Hafiz; E. Denarié. Tensile response of Ultra High Performance PE Fiber Reinforced Concretes (PE-UHPFRC) under imposed shrinkage deformations. Materials and Structures 2021, 54, 1 -12.
AMA StyleA. Hajiesmaeili, M. A. Hafiz, E. Denarié. Tensile response of Ultra High Performance PE Fiber Reinforced Concretes (PE-UHPFRC) under imposed shrinkage deformations. Materials and Structures. 2021; 54 (3):1-12.
Chicago/Turabian StyleA. Hajiesmaeili; M. A. Hafiz; E. Denarié. 2021. "Tensile response of Ultra High Performance PE Fiber Reinforced Concretes (PE-UHPFRC) under imposed shrinkage deformations." Materials and Structures 54, no. 3: 1-12.
A novel Ultra High-Performance Fiber Reinforced Concrete (UHPFRC) mix with synthetic fibers and a low clinker matrix, henceforth referred to as PE-UHPFRC, has been developed for structural applications. It exhibits a high tensile elastic limit above 7 MPa, a tensile strength of more than 10 MPa, and a very high tensile hardening domain of above 3.5%. In order to effectively use this material, its protective properties have been investigated on the basis of the effect of tensile deformation and subsequent cracking on water transport properties, for a wide range of tensile strain. A special setup was developed to measure the capillary absorption of liquids while the specimen is under tension. The results show a considerable reduction in capillary absorption in case of PE-UHPFRC compared with Strain Hardening Cement-based Composites (SHCC). Moreover, the results highlight the considerable effect of the onset of cracking on capillary absorption.
Amir Hajiesmaeili; Emmanuel Denarié. Capillary flow in UHPFRC with synthetic fibers, under high tensile stresses. Cement and Concrete Research 2021, 143, 106368 .
AMA StyleAmir Hajiesmaeili, Emmanuel Denarié. Capillary flow in UHPFRC with synthetic fibers, under high tensile stresses. Cement and Concrete Research. 2021; 143 ():106368.
Chicago/Turabian StyleAmir Hajiesmaeili; Emmanuel Denarié. 2021. "Capillary flow in UHPFRC with synthetic fibers, under high tensile stresses." Cement and Concrete Research 143, no. : 106368.
(PE)-UHPFRC, a novel strain hardening ultra high-performance fiber reinforced concrete (UHPFRC) with low clinker content, using Ultra-High Molecular Weight Polyethylene (UHMW-PE) fibers, was developed for structural applications of rehabilitation. A comprehensive life cycle assessment (LCA) was carried out to study the environmental impact of interventions on an existing bridge using PE-UHPFRC compared with conventional UHPFRC and post-tensioned reinforced concrete methods in three categories of global warming potential (GWP), cumulative energy demand (CED), and ecological scarcity (UBP). The results showed 55% and 29% decreases in the environmental impact of the PE-UHPFRC compared with reinforced concrete and conventional UHPFRC methods, respectively, which highlighted the effectiveness of this material for the rehabilitation/strengthening of structures from the viewpoint of environmental impact.
Amir Hajiesmaeili; Francesco Pittau; Emmanuel Denarié; Guillaume Habert. Life Cycle Analysis of Strengthening Existing RC Structures with R-PE-UHPFRC. Sustainability 2019, 11, 6923 .
AMA StyleAmir Hajiesmaeili, Francesco Pittau, Emmanuel Denarié, Guillaume Habert. Life Cycle Analysis of Strengthening Existing RC Structures with R-PE-UHPFRC. Sustainability. 2019; 11 (24):6923.
Chicago/Turabian StyleAmir Hajiesmaeili; Francesco Pittau; Emmanuel Denarié; Guillaume Habert. 2019. "Life Cycle Analysis of Strengthening Existing RC Structures with R-PE-UHPFRC." Sustainability 11, no. 24: 6923.
Mohamed Abdul Hafiz; Amir Hajiesmaeili; Emmanuel Denarié. Tensile response of low clinker UHPFRC subjected to fully restrained shrinkage. Cement and Concrete Research 2019, 124, 1 .
AMA StyleMohamed Abdul Hafiz, Amir Hajiesmaeili, Emmanuel Denarié. Tensile response of low clinker UHPFRC subjected to fully restrained shrinkage. Cement and Concrete Research. 2019; 124 ():1.
Chicago/Turabian StyleMohamed Abdul Hafiz; Amir Hajiesmaeili; Emmanuel Denarié. 2019. "Tensile response of low clinker UHPFRC subjected to fully restrained shrinkage." Cement and Concrete Research 124, no. : 1.
Ultra-high performance fiber reinforced concretes (UHPFRC) have demonstrated their potential to contain the explosion of maintenance costs (Economy and Environment) for civil engineering structures, due to their extremely low permeability associated with the outstanding mechanical properties. Substitution of embodied-energy (EE)-costly components of UHPFRC such as clinker and steel fibers, is the next step towards sustainability, to make it even more efficient and more environment-friendly. In this study, a strain hardening UHPFRC mix with two main modifications has been developed in which (1) 75% of steel fibers have been replaced by ultra-high molecular weight polyethylene (UHMWPE, henceforth referred to as PE) fibers and (2) 50% volume of cement type CEM I have been replaced with limestone filler. The effect of the fiber orientation and the specimen thickness on the mechanical properties of such mixes have been investigated. The mechanical properties have been investigated using direct tensile test, and 4-point bending test. Finally, the dramatic effect of fiber orientation on the ultimate strength and deformability has been demonstrated. Moreover, the results confirm that the specimen thickness affects the deformation capacity of the specimens. Finally, improvements in terms of reduction of EE of the proposed mixes, are highlighted.
Amir Hajiesmaeili; Emmanuel Denarié. Effect of Fiber Orientation and Specimen Thickness on the Tensile Response of Strain Hardening UHPFRC Mixes with Reduced Embodied Energy. High Performance Fiber Reinforced Cement Composites 6 2017, 15, 324 -332.
AMA StyleAmir Hajiesmaeili, Emmanuel Denarié. Effect of Fiber Orientation and Specimen Thickness on the Tensile Response of Strain Hardening UHPFRC Mixes with Reduced Embodied Energy. High Performance Fiber Reinforced Cement Composites 6. 2017; 15 ():324-332.
Chicago/Turabian StyleAmir Hajiesmaeili; Emmanuel Denarié. 2017. "Effect of Fiber Orientation and Specimen Thickness on the Tensile Response of Strain Hardening UHPFRC Mixes with Reduced Embodied Energy." High Performance Fiber Reinforced Cement Composites 6 15, no. : 324-332.