Electronic Methods For Determining Young S Modulus And Poisson S Ratio Of Portland Cement Concrete

Electronic Methods for Determining Young's Modulus and Poisson's Ratio of Portland Cement Concrete

Electronic methods were developed for measuring strain in portland cement concrete for the purposes of determining Young's modulus and Poisson's ratio, and comparative tests were made of electronic and mechanical methods. (Author).

Technical Report

Young's Modulus of Elasticity and Poisson's Ratio of Plain Concrete

Dynamic and static determinations of Young's modulus and Poisson's ratio were made on concrete cylinders to establish a relationship between the two methods when applied to concrete test specimens. Three curing conditions, three sizes of cyliners, and two strengths of concrete were used; the cylinders were tested at 2, 4, 7, 12, and 24 weeks from the casting date. Dynamic values were calculated from the fundamental transverse, longitudinal, and torsional frequencies of the specimens. The static test results were not influenced by the cylinder size, and no difference could be found between the dynamic results for the cylinders. Dynamic values are affected slightly by prior static loading, the concrete cylinders exhibiting a small reduction in Young's modulus. The magnitude and recovery of this loss is dependent upon the age and/or the moisture content of the concrete at time of test. There is no constant relationship between the values for Young's modulus of elasticity and Poisson's ratio for concrete as determined by static and dynamic methods. (Author).