Construction and technical properties of vermiculite concrete and fibro vermiculite concrete with volcanic pumice under the influence of elevated temperatures

Objective. Development of compositions vermiculite concrete and fibro with volcanic pumice. Investigation the construction technical properties developed fibrovermiculite pumice under influence elevated temperatures. Method. Methods increasing fire resistance reinforced structures are considered. The research is aimed at development for protection building manufacture heat-resistant products structures. To reduce cost concrete, its partial replacement proposed. For study basalt fiber, a rotatable plan second order regular hexagon type was used. Result . Replacing part an expensive aggregate (expanded vermiculite) leads to slight increase in average density composite, while bending compressive strength increases. In addition, increased. This due fact that pumice, being hydraulically active additive, able react hydration cement components, eliminating harmful effect secondary free calcium oxide. heating temperature on change fibrovermiculic including addition has been studied. It found dispersed reinforcement fibers reduces shrinkage deformations, when heated t = 800, decreases from 0.7 0.5% compared original matrix. Conclusion dependence "compressive f (average density)" significantly depends presence ratio composition holding 600 oC or 800 decrease 15 25%, main occurs oC, further negligible effect. generally maintained regardless temperature, does not relative strength, i.e. / reduced. Dispersed fiber increases by about 70% temperature.