Cracking & Deflection Of R.C Beam Models Including Additives

Abstract

The aim of this research is to study the effect of liquid additives on strength and behavior of R.C beam models . Cracking and deflection of these beam models has been studied . The liquid additives (High-range water reducing/superplasticizer ) in different ratios of cement weight in the range of 0% , 0.4% , 0.8% , 1.2% , 1.6% , 2% have been used . The compressive strength of concrete was measured at 7and 28 days 0f age and modulus of elasticity of concrete , shear modulus , modulus of volume change , Poisonُ s ratio , deflection and cracking at 28 days . have been calculated . It became evident from the test results of the compressive strength , modulus of elasticity of concrete , shear modulus , modulus of volume change , Poisons ratio and deflection for the different beams when the additives were used in reinforced concrete model beams in the ratio of 1.6 % of the cement weight achieved the best results . It can also be concluded that the cracking behavior (both at first cracking stage and at ultimate load ) is not affected by additives.