Three-level experimental approach for creep and shrinkage of high-strength high-performance concrete

Abstract Most of the existing prediction models for creep and shrinkage are established based on the statistical regression analysis of test data drawn mostly from experiments performed on normal-strength concrete, and they might not be as applicable to high-strength high-performance concrete. The prediction precision can be improved by carrying out on the given concrete short-term creep and shrinkage measurements. A three-level experimental approach for creep and shrinkage is proposed in this study. Take the high-strength high-performance concrete used in the auxiliary shipping channel bridge of Sutong Bridge for example, the detailed three-level experimental process and results were presented. The specimens were grouped on three levels: “Material level”, “Component level” and “Structural level”. On the first level, plain concrete specimens were experimented in a constant temperature and constant humidity room. On the second level, creep and shrinkage of reinforced concrete specimens with different reinforcement ratio were experimented. On the third level, the long-term behavior of a segmental concrete cantilever beam, 12.8 m long, under natural environment which was close to that of the actual bridge was studied. This experimental approach can provide a new train of thought to improve the predicted precision of the creep and shrinkage effects of the long-span concrete structures.

[1]  Maher K. Tadros,et al.  Creep, Shrinkage, and Modulus of Elasticity of High-Performance Concrete , 2001 .

[2]  In Hwan Yang,et al.  Uncertainty and sensitivity analysis of time-dependent effects in concrete structures , 2007 .

[3]  Jin Keun Kim,et al.  Material Properties of Self-Flowing Concrete , 1998 .

[4]  Alan H. Mattock,et al.  Influence of Size and Shape of Member on the Shrinkage and Creep of Concrete , 1966 .

[5]  Z. Bažant,et al.  Practical Prediction of Time-Dependent Deformation of Concrete, Part 1 : Shrinkage , 1978 .

[6]  N. J. Gardner,et al.  Design Provisions for Drying Shrinkage and Creep of Normal-Strength Concrete , 2001 .

[7]  Francis T. K. Au,et al.  Accurate time-dependent analysis of concrete bridges considering concrete creep, concrete shrinkage and cable relaxation , 2011 .

[8]  Amin Ghali,et al.  Relaxation of Steel in Prestressed Concrete , 1985 .

[9]  Z. P. Bažant,et al.  Practical prediction of time-dependent deformations of concrete , 1978 .

[10]  Z. Bažant,et al.  Creep and shrinkage prediction model for analysis and design of concrete structures-model B3 , 1995 .

[11]  Sandeep Baweja,et al.  Justification and refinements of model B3 for concrete creep and shrinkage 1. statistics and sensitivity , 1995 .

[12]  H. Mertol.  Behavior of High-Strength Concrete Members Subjected to Combined Flexure and Axial Compression Loadings , 2006 .

[13]  Zhitao Lu,et al.  Re-evaluation of CEB-FIP 90 prediction models for creep and shrinkage with experimental database , 2013 .

[14]  Luc Taerwe,et al.  fib model code for concrete structures 2010 , 2013 .

[15]  Roman Wendner,et al.  The B4 Model for Multi-decade Creep and Shrinkage Prediction , 2013 .

[16]  Zdeněk P. Bazant,et al.  Justification and refinements of model B3 for concrete creep and shrinkage 2. Updating and theoretical basis , 1995 .

[17]  Maher K. Tadros,et al.  PRESTRESS LOSSES IN PRETENSIONED HIGH-STRENGTH CONCRETE BRIDGE GIRDERS , 2003 .

[18]  C. Fu,et al.  Experimental Study on Creep and Shrinkage of High-Strength Plain Concrete and Reinforced Concrete , 2011 .

[19]  Holger Keitel,et al.  Uncertainty and sensitivity analysis of creep models for uncorrelated and correlated input parameters , 2010 .

[20]  In Hwan Yang,et al.  Prediction of time-dependent effects in concrete structures using early measurement data , 2007 .

[21]  Antonio R. Marí,et al.  Long-term deflections in cracked reinforced concrete flexural members , 2010 .