Tensile strength of concrete were examined on its partial replacement of cement and sand using ground granulated blast furnace and quarry dust, the study examines its behaviour at different dimensions, this is to monitor the variation effect of these parameters on the growth rates of tensile to the optimum curing age, these includes non linear conditions of tensile state, non-elastic and its brittle behaviour at all times as it express zero conditions in tension, this means that it has the ability to with stand pull force, it also reflect its weak ability to handle shear stress thus tends to cause deformation in material as it has poor elasticity. The reflection of its brittle influence the rate of tensile behaviour from concrete ductility, these are known to be a material on modern mechanics of concrete. These also considered as quasi brittle material, this behaviour were reflected as the system considered evaluating the growth rate of tensile strength that replaced cement and sand with these locally sourced addictives. the developed model monitor other reflected influential parameters such as variation of concrete porosity due it compaction in placements, tensile behaviour reflects these effect that subject it to mechanical properties of concrete, the study expressed the reaction of these parameters in the simulation, the evaluation of these affected the details variation of tensile growth rate at different water cement ratios and curing age, the tensile behaviour that were monitored are based on these factors in the study, these derived model were validated with Jaharatul et al 2018, and both parameters developed best fits correlation, the study is imperative because the system expressed the behaviour of tensile strength from concrete at different dimensions, experts can applied these concept to monitor tensile behaviour considering these parameters in its growth rates.