Inputs of Portland Cement Concrete Parameters Needed for the Design of New and Rehabilitated Pavements in Mississippi; Final rept., Oct 04-Sep 07

摘要

The use of a hierarchical approach in the 2002 Mechanistic-Empirical Pavement Design Guide to determine inputs for structural analysis and design allows the user considerable flexibility for obtaining input data. This approach consists of three levels. The first level of inputs requires laboratory or field testing which provides the highest level of accuracy. Laboratory assessment was made to generate the PCC required parameters for implementations of the design of rigid pavement. More specifically, the following parameters were obtained for typical concrete mixes used throughout the state which include five types of aggregates and four different blends of cements: (1) Modulus of Rupture (ASTM C 78); (2) Compressive Strength (ASTM C 39); (3) Modulus of Elasticity (ASTM C 469); (4) Tensile Strength (ASTM C 469); (5) Coefficient of Thermal Expansion (AASHTO T P60); (6) Concrete Shrinkage (ASTM C 157); (7) Unit Weight (ASTM C 138); and (8) Poissons Ratio (ASTM C 469). As an outcome of this research, the requisite values were obtained for the input parameters for the common concrete mixes used in Mississippi. These values would then be entered into a materials library for use by a pavement designer off the new design code.