Effect of a temperature change from 20 to 50°C on the basic creep of HPC and HPFRC

• Published in: Materials and structures Vol. 44; no. 9; pp. 1629 - 1639
• Main Authors: Ladaoui, Wahid, Vidal, Thierry, Sellier, Alain, Bourbon, Xavier
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.11.2011; Springer; Springer Nature B.V
• Subjects: Applied sciences; Building construction; Building Materials; Buildings. Public works; Civil Engineering; Concretes. Mortars. Grouts; Engineering; Exact sciences and technology; Machines; Manufacturing; Materials; Materials Science; Original Article; Other special applications (sand concrete, roller compacted concrete, heavy concrete, architectural concrete, etc.); Processes; Solid Mechanics; Strength of materials (elasticity, plasticity, buckling, etc.); Structural analysis. Stresses; Theoretical and Applied Mechanics; Basic creep; Temperature; Modelling; Activation energy; Performance evaluation; Rheological model; Material composition; Creep; Construction materials; Is Basic creep; Temperature effect; Experimental device; Experimental study; Modeling; Fiber reinforced concrete; High strength concrete
• ISSN: 1359-5997; 1871-6873
• DOI: 10.1617/s11527-011-9723-z

This research was performed in order to study the basic creep of High Performance Concretes (HPC) under uniaxial compression at 20 and 50°C. The aim of this work is to contribute to a better understanding of the basic creep phenomena of HPC at moderate temperature and to provide experimental data which will be used in Thermo-Hydro-Mechanical models such as those necessary for the National project CEOS.FR (Sellier, Thermo hydro mechanical numerical modelling, invited paper at the CEOS International workshop on Control of cracking in R.C. structures: a major step towards serviceability, 2009 ). The article also presents the fitting of a model considering the effect of temperature via an Arrhenius law affecting its viscous modules (Sellier and Buffo-Lacarriere, Eur J Environ Civ Eng 10:1161–1182, 2009 ). The concretes are those envisioned for future storage structures of Intermediate Level Long-Life Nuclear Wastes. The research programme has been established with four HPC, two non fibrous and two fibrous; the kinetics and amplitude of basic creep under uniaxial compression are measured during several months at 50°C and compared to those obtained at 20°C for the same materials (Camps, PhD thesis, 2008 ). Experimental results show that the average creep at 50°C is about twice the creep at 20°C. Besides, results show that this amplification depends on the binder type; the sensitivity to the temperature rise is greater for blended cement based concretes than for OPC based ones. The creep increase due the temperature rise is higher for the HPC under study than for ordinary concretes inventoried in a literature survey. The creep amplitude of HPC seems correlated to their amount of secondary C–S–H. At last, the fitting of the model parameters on the experimental results shows that the values of activation energy are quite close to those obtained by other authors on ordinary concretes (Bazant et al., J Eng Mech ASCE 130(6): 691–699, 2004 ).