we present the results of studies of vermiculite concrete composites with various silica components such as cinder, tuff sand and volcanic ash for fire protection of building structures. The study shows that introduction of saponified wood resin into the vermiculite concrete mixture improves its rheological properties and reduces the average density of the composite. Portland cement can replace up to 20-25% of the mass of ash, tuff sand and cinder without significant deterioration of the properties of vermiculite concrete. Dispersed basalt fiber reinforcement of cement vermiculite concrete increases the strength and fire-resistant properties of the initial matrix.
The results of research on the development of heat-resistant cement composites using volcanic pumice and expanded vermiculite are presented. Compositions of heat-resistant cement composites are proposed that significantly reduce Portland cement consumption and simultaneously improve their heat-resistant properties. The use of basalt fibers in composites makes it possible to increase their strength, crack resistance and heat-resistant properties due to the perception of tensile temperature stresses. Part of the expensive vermiculite can be replaced by pumice without significantly increasing the average density of the composite, while their strength characteristics increase.
There is the study outcome of the stress-strain state of single-layer and double-layer reinforced concrete elements with simple bending in the article. The data obtained in numerical experiments on finite element schemes perfectly matches the field tests results.
The results of studies of fibropenot phobet with the use of sawing volcanic tuff are shown. The compositions of fibropenot phobetons with the use of nylon and basalt fibers have been developed, which allow to significantly reduce shrinkage deformations and increase the strength characteristics of foam phobeton. The maximum increase in compressive strength by 38% and during bending by 110% is observed in samples of fibro-phenotope concrete with reinforcement of 0.6% by volume of basalt fiber. The combination of fibers, with the same volumetric concentration, is more effective for reducing the shrinkage of the foam-photon concrete as compared to mono-reinforced samples.
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