Creep; Pull-out; Sustainability; Grey Energy; Strain hardening; Shrinkage; Transport properties; Maintenance; Synthetic fibres; High stress level; Limestone Filler; UHPFRC
Hajiesmaeili Amir, Denarié Emmanuel (2018), Next generation UHPFRC for sustainable structural applications, in 2nd International Workshop on Durability and Sustainability of Concrete Structures
, MoscouACI, Farmington HIlls, MI, USA.
HajiesmaeiliAmir, DenariéEmmanuel (2018), Next Generation UHPFRC for Sustainable Structural Applications, ACI, USA, 58.
Hajiesmaeili Amir, Denarié Emmanuel (2017), Effect of fiber orientation and specimen thickness on the tensile response of strain hardening UHPFRC mixes with reduced Embodied Energy, in Strain-Hardening Cement-Based Composites SHCC4
, DresdenSpringer, Netherlands.
Zingg S., Habert G., Lämmlein T., Lura P., Denarié E., Hajiesmaeili A. (2016), Environnemental Assessment of Radical Innovation in Concrete Structures, in Sustainable Built Environment Conference, SBE16
, Zürichvdf Hochschulverlag AG an der ETH Zürich, Zürich.
The premature deterioration of the built environment is a heavy burden for society, especially in terms of economy, energy consumption and CO2 emissions induced by construction and rehabilitation sites. Transportation networks at all levels (national, regional and local) are critical to the Swiss economy and their maintenance costs (Economy, Energy, and Environment) need to be contained within sustainable limits. The same applies to all the built environment. The range of possible applications of UHPFRC, alone or associated to reinforcement bars, in the fields of transport infrastructures and buildings, both for the rehabilitation, protection, or reinforcement of existing structures or for the construction of new light weight structural members is very wide. The intelligent use of these and highly durable and efficient materials in the field of construction has a very high potential to be one of the solutions to contain the explosion of maintenance costs (Economy, Energy and Environment) in the near future and make a better use of environmental resources with smart concretes, structures and maintenance strategies. The objectives of the project are to further improve the already established concept of UHPFRC application in the built environment in two main directions, to develop a new generation of Low- Grey Energy UHPFRC, in view of the energy strategy 2050:(1) develop new strain hardening UHPFRC mixes with massive substitution of energy costly components (matrix and fibrous mix). (2) determine the mechanical and protective properties of these materials, with a special emphasis on their quasi static (tension), delayed response (creep and shrinkage), and transport properties under high stress levels.These domains have been barely studied until now. Mechanical testing of the resistance, deformability and viscous response, as well as modelling of the time dependent mechanical response will be performed at various scale levels. An optimized Electromechanical testing machine will help perform tensile tests. Existing testing set-ups (TSTM and tensile creep rigs) will be used for tests at very early age and longer term. Pull-out tests on individual fibres will be performed at quasi static loading rates and under creep loading.The research will be performed by one doctoral student (3 years).