EFFECT OF TYPE AND COMPOSITION OF CHEMICAL ADMIXTURE ON PROPERTIES OF PRODUCED CONCRETE

This work aims to study the effect of different types of superplastizicer. The experiment work included test on slump flow, compressive strength, splitting and modulus of rupture. Water cement ratio and cement content were maintained constant (0.45 and 350 Kg/m3) respectively. Three different admixture (polycarboxylic ether melamine formaldehyde, and of sulphonated naphthalene) have been used. Four dosage of superplastizicer were adopted (0.5, 1, 1.5, 2 and 2.5) liters for 100 Kg of cement. Based on the experimental results, superplasticizers based on Modified polycarboxylic ether are more efficient than other superplasticizers, concerning the degree of workability, compressive strength, and flexible strength Over dosage of SP found to deteriorate the properties of concrete, signs of bleeding and segregation were noticed. However, if the dosage levels of SP are lower than the optimum dosage, increase in admixture dosage may help to enhance the concrete characteristics