EFFECT OF S A RATIO ON THE ELASTIC-MODULUS OF CEMENT-BASED MATERIALS/

In order to investigate the elastic modulus of aggregate and the effec t of fine aggregate content on the elastic modulus of concrete, cylind rical specimens (phi 100x200 mm) with different volume ratios (S/A, fi ne aggregate volume/total aggregate volume) and various water/cement r atios were cast and tested. Both single-inclusion and double-inclusion models were applied to predict the elastic moduli of two-phase and th ree-phase cement-based composite materials, respectively. The elastic moduli of sand and coarse aggregate were derived from the experimental results using the theoretical models. In addition, the elastic modulu s of concrete is not significantly influenced by the SIA ratio for a c onstant aggregate volume.