TY - GEN
T1 - Backcalculation of subgrade stiffness under rubblized PCC slabs using multi-level FWD loads
AU - Mun, Sungho
AU - Kim, Y. Richard
PY - 2007
Y1 - 2007
N2 - Rubblization is an effective rehabilitation method for deteriorated Portland cement concrete (PCC) pavements due to its low initial cost, minimum traffic disruption, and ability to minimize reflective cracking in asphalt overlays. However, the loss of strength in PCC slab due to rubblization creates the demand for a subgrade that is strong enough to handle traffic after rubblization. This paper presents a research effort to develop an analysis method that allows the realistic estimation of subgrade stiffness after rubblization from deflection measurements on intact PCC slabs before rubblization. As a forward model, stress/strain dependent nonlinear subgrade models were incorporated into a finite element analysis (FEA). Based on the synthetic database generated from the FEA, a number of relationships were developed to predict the coefficients in the nonlinear subgrade model from falling weight deflectometer (FWD) deflections.
AB - Rubblization is an effective rehabilitation method for deteriorated Portland cement concrete (PCC) pavements due to its low initial cost, minimum traffic disruption, and ability to minimize reflective cracking in asphalt overlays. However, the loss of strength in PCC slab due to rubblization creates the demand for a subgrade that is strong enough to handle traffic after rubblization. This paper presents a research effort to develop an analysis method that allows the realistic estimation of subgrade stiffness after rubblization from deflection measurements on intact PCC slabs before rubblization. As a forward model, stress/strain dependent nonlinear subgrade models were incorporated into a finite element analysis (FEA). Based on the synthetic database generated from the FEA, a number of relationships were developed to predict the coefficients in the nonlinear subgrade model from falling weight deflectometer (FWD) deflections.
UR - https://www.scopus.com/pages/publications/84863275108
M3 - Conference contribution
AN - SCOPUS:84863275108
SN - 9780415448802
T3 - Advanced Characterisation of Pavement and Soil Engineering Materials - Proceedings of the International Conference on Advanced Characterisation of Pavement and Soil Engineering Materials
SP - 925
EP - 937
BT - Advanced Characterisation of Pavement and Soil Engineering Materials - Proceedings of the International Conference on Advanced Characterisation of Pavement and Soil Engineering Materials
T2 - International Conference on Advanced Characterisation of Pavement and Soil Engineering Materials
Y2 - 20 June 2007 through 22 June 2007
ER -