Gypsumcementpozzolana Composites with Application Volcanic Ash

It is established, that the development of new effective gypsumconcrete composites on the basis of technogenic raw material and local materials is urgent task. For eliminating the deficiencies in the gypsum materials and articles is proposed the application of pumice as the filler and the active mineral additive. The influence of the additives of portland cement on the properties of hemihydrate gypsum is at shown on table. Further are given the results of studies of the properties of composite in the dependence on the relationship of the components of gypsum, ashes and portland cement, and also grain composition of pumice. It is revealed, that the application of pumice together with the portland cement in the gypsumconcrete composites makes it possible to reduce the expenditure of gypsum to 50% without considerable reduction in the strength characteristics. In this case the developed gypsum concrete composites have the increased water resistance. It is established that the influence of the granulometric composition of ashes on the strength properties of composite is ambiguous, in the compositions with the high content of ashes the use of larger fractions is expedient, and with the content it is less than 50% ashes in the composite - small fractions.Consideration of gypsumcementpozzolana composites using gypsum, Portland cement and volcanic ash. The results of studies of the composition and physico-mechanical properties of the composites gypsumcementpozzolana, the influence of the grain size of volcanic ash on their properties.