This research work has one main objective; which is to investigate the possibilityof producing early strength self-compacting concrete using different types of superplasticizers(type F).In order to achieve this objective, a test program was designed and divided into two stages.The first stage includes the investigation of the addition of three different types ofsuperplasticizers (type F) individually from the Egyptian local market on the properties of freshearly strength self-compacting concrete. Characteristics of the various produced concretesare measured such as air content , time from immediately lifting the cone and the supportedconcrete is allowed to slump to reach a diameter of 50cm ( t 50 )., and slump flow test . Thesecond stage involves testing of compressive strength at ages 1 day, 3 days , 7 days , and 28days for mixes selected from the first stage as well as testing the modulus of elasticity at age28 days .Two main variables were investigated through the two stage program. They were:the effects of different types of superplasticizers (type F) and different superplasticizeradmixture which complies with ASTM C494 Types G and F was used in all mixes (VI) ( 2 %by weight of cement ) contents on the production of early strength self-compacting concrete.Results proved feasibility of producing early strength self-compacting concrete (200 kg/cm2)in the presence of high dosages of superplasticizers .
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