A Proposed Equation for Elastic Modulus of High-Strength Concrete Using Local Aggregates in Iraq

摘要

There several of equations to determine the modulus of elasticity by codes of practice and researchers. They differ in the form of the equations and their parameter functions. Many codes and researches advise engineers of the dependence of the modulus of elasticity on the aggregate type, size and shape; and, hence, it is wise to determine the concrete properties for the specified mix from the trial batches. This paper considers the Iraqi aggregates used in producing the HSC to develop and equation for prediction the modulus of elasticity for HSC. Modulus of elasticity of high strength concrete using Iraqi aggregate with a wide range of 41 to 83.3 MPa has been studied and by analyzing 69 tests from the available literature. An empirical equation has been proposed for prediction of modulus elasticity presents the local aggregate in Iraq. The predicted values are compared with the predictions by codes of practice like ACI 318-02, EC2-02 and a practical equation by Noguchi et al. It has been found that there are differences in the predictions between them and the proposed equation. The ACI overestimates the modulus of elasticity for these tests and 80 of the tests are below it, while EC2 values are over conservative as they are below 78 of test values. The proposed equation is lie between the two codes. The prediction by Noguchi et al. showed better results as they are very close to the proposed equation.