POZZOLANIC ACTIVITY AND MECHANISM OF REACTION OF RED TROPICAL SOIL-LIME SYSTEMS

This paper presents a study on the pozzolanic properties and mechanism of reaction of nineteen red tropical soils from north east Brazil. The results of the study show that the mechanism of reaction between soil and lime is mainly a diffusion controlled process which can be expressed by the equation of Jander. Based on the constant rates of reaction obtained from this equation and on the quantity of reactive components of the soils and activity index A sub i is proposed and its validity tested against the unconfined compressive strength of the lime-soil system. A valid statistical correlation is presented linking the A sub i value with the empirical reactivity parameter of Thompson. /Authors/