Fibro-gypsum-cement-vermiculite-concrete thermal-fire-protective composites with volcanic ash
Abstract
Fibro-gypsum-cement-vermiculite-concrete thermal-fire-protective composites with volcanic ash
Incoming article date: 11.02.2025The article presents the results of studies of the strength properties of heat-protective fiber-gypsum-cement-vermiculite-concrete (FGCPVC) composites with volcanic ash with a maximum grain size of 0.16 mm, polydisperse reinforced with polypropylene RS produced by Russeal and basalt fibers of the RNB-9-1200-4s grade produced by PAO Ivosteklo. Expanded vermiculite of the 0.16–5 mm fraction from the St. Petersburg Mica Factory was used. It was found that the efficiency of the SDO additive at a dosage of up to 0.2% is from 2.3 to 3.1% of entrained air per 0.1% SDO, further increase in the dosage is impractical. Polypropylene fibers do not have a significant effect on the strength properties of FGCPVC composites. Reinforcement of FGCPBB composites with basalt fibers increases the compressive strength by up to 16%, bending strength by up to 73%, the Rf/R ratio with equal compressive strength increases to 51%. Polydisperse reinforcement of FGCPBB composites with basalt and polypropylene fibers increases the compressive strength by up to 40%, bending strength by more than two (2.26) times, the Rf/R ratio with equal compressive strength increases to 65%.
Keywords: gypsum, portland cement, ash, expanded vermiculite, polypropylene and basalt fibers, composites, compressive and flexural strength