Вестник СибАДИ (Nov 2018)
GAS CONCRETE FOR CONSTRUCTION OBJECTS OF TRANSPORT INFRASTRUCTURE
Abstract
Introduction. Construction objects of transport infrastructure have different influence and service conditions. An actual technical task is the design of optimal microclimate for human operation in workshops and office buildings. Therefore, such conditions can be achieved by using of construction material with high parameters of heat- and sound-insulation such as a gas concrete. The main task of the research is the improvement of heat- and sound-insulation in the gas concrete.Materials and methods. The evaluation of the gas concrete efficiency is based on the research of such parameters as heat- and sound-insulation. The analysis of the material at macro- and micro-level is performed with SEM-analysis and BET-analysis. In addition, the complex of experimental and calculated data of physical and chemical characteristics for gas concrete is carried out.Results. As a result, the usage of amorphous alum inosilicate raw materials in gas concrete allows variation of parameters to effect on pore structure such as homogeneous pore distribution in bulk, thickness and density of interpore partition, pore shape and pore size. The reduction of aerated concrete density by 22.5 % leads to reducing of heat conductivity by 19.26 %. The formation of cellular structure with mainly closed pores allows reducing of sorption humidity and vapor permeability of material under different environmental humidity.Differently-sized pores in the gas concrete and predominantly small pores with size of 0.3-0.9 mm as well as with size up to 94,6 nm leads to increasing isolation index of airborne sound due to increasing of absorption of acoustic wave in frequency range of 125-4000 Hz. Complexly, it provides high sound-insolating parameters of wall envelopes.Discussion and conclusions. Monitoring of heat- and sound-insolation of the gas concrete due to optimization of pore structure allows formation of energy effective composites able to protect humans from unfavorable environment in the transport enterprises.
Keywords
