Role of Lightweight Synthetic Particles on the Restrained Shrinkage Cracking Behavior of Mortar

This paper describes the role of lightweight synthetic particles (LSP) on the restrained shrinkage cracking behavior of mortar in sealed conditions. The free shrinkage, elastic modulus, split-tensile strength, and restrained shrinkage behavior of mortar were investigated with respect to the inclusion of low volumes of LSP. Although the use of the LSP increases free shrinkage, decreases tensile strength, decreases elastic modulus, and increases stress relaxation, these particles can be beneficial in reducing the stress that develops when shrinkage is restrained. This can result in a delay or possible prevention of restrained shrinkage cracking.

[1]  A. R. Mohamed,et al.  MICROMECHANICAL MODELING OF CRACK-AGGREGATE INTERACTION IN CONCRETE MATERIALS , 1999 .

[2]  Zvi Hashin,et al.  The Elastic Moduli of Heterogeneous Materials , 1962 .

[3]  Dale P. Bentz,et al.  Mitigation strategies for autogenous shrinkage cracking , 2004 .

[4]  W. Jason Weiss,et al.  Influence of specimen size/geometry on shrinkage cracking of rings , 2000 .

[5]  Tommy Nantung,et al.  Volume change and cracking in internally cured mixtures made with saturated lightweight aggregate under sealed and unsealed conditions , 2009 .

[6]  K. Ganesh Babu,et al.  Properties of lightweight expanded polystyrene aggregate concretes containing fly ash , 2005 .

[7]  Pietro Lura,et al.  Autogenous Deformation and Internal Curing of Concrete , 2003 .

[8]  Akhter B. Hossain,et al.  Assessing residual stress development and stress relaxation in restrained concrete ring specimens , 2004 .

[9]  Bing Chen,et al.  Properties of lightweight expanded polystyrene concrete reinforced with steel fiber , 2004 .

[10]  Konstantin Kovler,et al.  Testing system for determining the mechanical behaviour of early age concrete under restrained and free uniaxial shrinkage , 1994 .

[11]  Dale P. Bentz,et al.  Internal Curing of High-Performance Blended Cement Mortars , 2007 .

[12]  K. Ganesh Babu,et al.  Effect of polystyrene aggregate size on strength and moisture migration characteristics of lightweight concrete , 2006 .

[13]  Surendra P. Shah,et al.  Shrinkage cracking of fiber reinforced concrete , 1990 .

[14]  M Duskov.  Dutch Design Manual for Lightweight Pavements with Expanded Polystyrene Geofoam , 2000 .

[15]  K. Ganesh Babu,et al.  BEHAVIOUR OF LIGHTWEIGHT EXPANDED POLYSTYRENE CONCRETE CONTAINING SILICA FUME , 2003 .

[16]  Daniel Cusson,et al.  Internal curing of high-performance concrete with pre-soaked fine lightweight aggregate for prevention of autogenous shrinkage cracking , 2008 .

[17]  W. Jason Weiss,et al.  Shrinkage Cracking of Restrained Concrete Slabs , 1998 .

[18]  D. W. Hobbs,et al.  The dependence of the bulk modulus, Young's modulus, creep, shrinkage and thermal expansion of concrete upon aggregate volume concentration , 1971 .

[19]  James J. Beaudoin,et al.  Pore structure of hardened portland cement pastes and its influence on properties , 1994 .

[20]  Torben Knudsen,et al.  The dispersion model for hydration of portland cement I. General concepts , 1984 .