This paper monitors the behaviour of stress-strain on model concrete that partially replace cementwith alccofine and fly ash, the stress-strain in concrete normally distort some level of determinant onthe extent of load, the values of strain in concrete is of immense imperative, because it stands for theinflexibility in terms of structural design, the study try to show some rate of stress development onconcrete that monitor lasting deformation if limits that are exceeded. The structure of concrete arealways subjected to stress through cyclic loading, therefore the study subject the concrete tomonitored the system on the elastic portion for design purpose, the modulus of concrete is determinedon different aggregates types, but the application of alccofine and fly ash has better finer materialthan cement while fly ash has a pozzolan qualities, the study monitor the material to determine it ratesof exhibition on the qualities from the derived strain values, the developed model values areinfluenced by these characteristic of concrete properties thus generated significant stress strain, thisimplies that it has the requirement for high performance concrete partially replacing cement withalccofine and fly ash, the simulation monitor the growth rates of stress-strain on influence ofvariation of water cement ratios at different curing age, similar concept were carried out on otherconcrete properties to determined there variation influences on the model developed concrete, therate of effect were examined and correlated, including their influence on growth rate of stress-strain,predictive values generated were subjected to simulation, and both parameters developed best fitcorrelation, the study has high rate of its significant because the simulation has express the extend ofit rate of model prediction, it has from partial replacement of cement with alccofine and fly ash. Theseare based on the derived model simulation parameters monitored to determine the rate of stressstrainin concrete model development.Keywords: Modeling stress, strain, fly ash, alccofine, and concrete strength
