Prediction of the Creep Behavior of Ultra-High Performance Concrete Beams

Ultra-high performance concrete (UHPC) is a new cement-based composite material that offers ultra-high compressive strength (120 MPa), excellent toughness, and excellent durability. It is a new cement-based material with excellent performance, which usually uses different particle size gradations of cementing materials (cement, silica ash, fly ash, mineral powder, etc.), fine aggregates and steel fibers to achieve the closest packing at an ultra-low water-binder ratio (about 0.2). These components and characteristics significantly reduce the size and dead weight of UHPC components, and significantly improve the seismic resistance and seawater corrosion resistance. The creep of concrete is a kind of non-elastic deformation which depends on load and is related to time, and will increase with the extension of load time. The characteristics of concrete creep models widely used in the world such as ACI 209R-92, CEB-FIP 2010, B3, GL2000, AASHTO and NFP18-710-2016 are analyzed in this paper. On this basis, the finite element analysis is carried out with the above model, and the comparison and analysis are made with the test values. Furthermore, the reasonable selection of creep model of UHPC is proposed.