THE MODULUS OF ELASTICITY OF HIGH-PERFORMANCE CONCRETE

To determine the modulus of elasticity of concrete precisely is very i mportant for structures that require strict control of the deformabili ty. International codes propose a wide variety of formulae which estab lish a relationship between modulus of elasticity and compressive stre ngth. Most of these codes are valid up to 50 MPa, the usual limit for normal concretes. A research programme has been carried out to establi sh the modulus of elasticity-compressive strength curve for low and hi gh strength concretes. The effect of the aggregate also has been studi ed. This is an important factor to take into account, sometimes more i mportant than the concrete strength itself or even age. A model code f ormula provides good correlation with experiment up to a compressive s trength of 120 MPa. Other aggregates not considered for this code have been studied and results given. Also, the influence of age of the mod ulus of elasticity is discussed.