Prediction of Nonlinear Stress-Strain Relationship of Lightly Stabilized Granular Materials from Unconfined Compression Testing

• Published in: Journal of materials in civil engineering Vol. 24; no. 8; pp. 1118 - 1124
• Main Authors: Paul, D. K, Gnanendran, C. T
• Format: Journal Article
• Language: English
• Published: Reston, VA American Society of Civil Engineers 01.08.2012
• Subjects: Aggregates and other concrete constituents; Applied sciences; Buildings. Public works; Cement concrete constituents; Compression tests; Computation methods. Tables. Charts; Exact sciences and technology; Granular materials; Materials; Mathematical models; Nonlinearity; Parameters; Proof stress; Regression; Stress-strain relationships; Structural analysis. Stresses; Technical Note; Technical Notes; Modified and extended Ramberg-Osgood expression; Compression; Proof stress; Stress strain relation; Stabilization; Binder content; Granular media; Construction materials; Compressive strength; Forecast model; Lightly stabilized granular materials; Stress strain relations; Nonlinear stress-strain behavior; Granular material
• ISSN: 0899-1561; 1943-5533
• DOI: 10.1061/(ASCE)MT.1943-5533.0000478

AbstractThis paper examines the nonlinear stress-strain behavior of lightly stabilized granular base materials and presents a method to predict them based on modified and extended Ramberg-Osgood expression from unconfined compression (UC) testing. A typical granular material was lightly stabilized with 0.5–3.0% cement-flyash (CF) as well as with 1.5–3.0% slag-lime (SL) and tested in UC with internal deformation measurement setup. This study indicates that the proposed mathematical model can accurately predict the nonlinear stress-strain relationships of the lightly stabilized materials obtained from the experiments. The parameters involved with the proposed model were initial elastic modulus E0, 0.2% proof stress σ0.2, ultimate strain εu, and the exponents for quantifying the nonlinearity of the curves n and m. Values of all the parameters were determined from the experimental stress-strain responses and reliable regression relationships were developed between these parameters and unconfined compressive strength (UCS).