Open AccessObtaining of heat-insulating materials based on silica-containing waste with the addition of dolomite
Author(s) -
Н. К. Манакова,
О. В. Суворова
Publication year - 2020
Publication title -
vestnik graždanskih inženerov
Language(s) - English
Resource type - Journals
ISSN - 1999-5571
DOI - 10.23968/1999-5571-2020-17-6-149-155
Subject(s) - dolomite , silica fume , materials science , sodium silicate , suspension (topology) , porosity , thermal conductivity , thermal insulation , foaming agent , composite material , chemical engineering , calcium silicate , compressive strength , metallurgy , mathematics , layer (electronics) , homotopy , pure mathematics , engineering
The paper presents the results of the study of feasibility of obtaining high-quality foamed thermal insulation materials based on a silicate matrix with addition of dolomite. It has been found out that the preliminary activation of a suspension based on a silica-containing component at a temperature of 90°C for 5-7 minutes allows accelerating the coagulation of silica fume and the synthesis of sodium silicates. Optimal foaming conditions for the charge frothing are 650-700°C for 25 minutes. There have been obtained foam silicates with a relatively uniform finely porous structure and stable physical and technical properties with density 0.38-0.48 g/cm³, strength up to 3 MPa, thermal conductivity 0.048-0.054 W/(m·K).