In products consisting of several components, physical and engineering properties are a function of the components proportions. A pozzolanic product can be understood as a ternary mixture where two components are ceramic solid particulates (e. g. fly ash and lime) and the third component is liquid (water). In this work experimental data of pozzolanic compositions and respective measured properties were adapted to the methodology of response surfaces using a mixture design of a constrained triangular surface. The results obtained were satisfactory for determination of equations that represent the desired properties as a function of the components variations of the ternary mixture. The use of this mathematical procedure can be an important tool to predict and understand the behavior of such type of ceramic mixtures.