Statistical Model for Predicting the Optimum Gypsum Content in Concrete

The problem of internal sulfate attack in concrete is widespread Iraq and neighboring countries.This because the high content usually present sand gravel used it. In study total effective was to calculate optimum SO3 content. Regression models were developed based on linear regression analysis predict referred as (O.G.C) concrete. data separated 155 for development 37 checking models. Eight built 28-days age. Then a late age (greater than 28-days) model predicted all ages. important results obtained from are positive effect C3S, C3Aand C4AF C3A about twice that C4AF. also showed trend fineness cement exceptin some this due statistical overlap