Experimental study and modeling the rupture model of a new hydraulic binder based on the combination of inorganic additions by the response surface methodology

The aim of this work is to determine by the experimental design of response surface methodology a model which predicts the compressive strength as a function of the proportion of the constituents of a new hydraulic binder based on a combination of different percentages of natural pozzolana (pn) and pure limestone ( p,lime). a second-degree polynomial model was therefore used to model the influence of three key parameters which are the water content,the proportion of natural pozzolan and the proportion of pure limestone,related to the compressive strength at 28 days,which represents the model of rupture,while the other components and the operating condition were kept fixed. our study has three essential phases:in the first phase,the objective is to determine the main physical,chemical,and mechanical characteristics of the materials used,the choice of the method of formulation and the realization of the different mixes. the second phase,which aims to analyze the effects and interactions between the various factors expected,to predict the most influential factor in response on one hand and to highlight it on the correlations and their interactions on the other hand. as for the last phase,it consists of the search for the optimum which is done by the response surface methodology of experimental design of each factor studied and the validation of the model retained. © 2017,university of mohammed premier oujda morocco.