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Red tropical soils are produced by natural chemical weathering. n e y contain appreciable quantities of amorphous silica and alumina and also large propom'ons of very poorly ordered clay minerals. For this reason they are considered to be a good source ofpouolanic material and may be used as raw feed for the manufacture of cement or as cement replacement for the production of concrete. This Paper presents the results of an investigation into the engineering properties and pegormance of concrete made with a mixture of cement/pouolan, where the pozzolan consisted of two types of red tropical soil. 7he Paper highlights the strength properties and chloride ion permeability characteristics of these mixtures and discusses the beneficial effects of using red tropical soils in concrete.

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