INFLUENCE OF THE MICRO-WOLLASTONITE ADDITIVES ON THE CRYSTALLIZATION AND PROPERTIES OF POROUS GLASS-CRYSTALLINE MATERIALS CONTAINING DIFFERENT TYPES OF GAS-FORMING AGENTS
DOI:
https://doi.org/10.15421/jchemtech.v30i3.254049Keywords:
porous glass-crystalline materials; temperature-time burning mode; glass cullet; loam; ash; slag; coefficient of constructive qualityAbstract
In the work, studies aimed at increasing the strength of porous glass–crystalline materials due to the formation of needle–like wollastonite crystals in the interpore partitions, which have a reinforcing effect, were carried out. Porous materials were obtained on the basis of glass cullet with the use of raw materials of natural (loam) and man–made (open–hearth furnace slag and blast furnace slag, fly ash) as gas–forming agents. Additives of microwollastonite in the amount of 1.5–7.5 mass. h. were added to the composition of glass mixtures with gas–forming agents. Samples were burned at temperatures of 750–850 °C, depending on the type of gas–forming agent. With the help of differential thermal analysis, the processes taking place in experimental batches with the content of microwollastonite additive under heating conditions were investigated, and with the help of X–ray phase analysis, the change in the phase composition of materials after burning was investigated. For the experimental samples the volumetric weight (kg/m3), compressive strength (MPa) were determined, and the coefficient of constructive quality was calculated. As a result of the work, it was established that the addition of microwollastonite contributes to the formation of wollastonite as the main crystalline phase in the materials, regardless of the type of gas–forming agent, and increases their strength to 6.3 MPa. The coefficient of constructive quality of the samples into which microwollastonite was introduced in the amount from 1.5 to 4.5 mass. h., increases by an average of 10 %, its further introduction contributes to the reduction of the specified coefficient due to the increase in the volumetric weight of the materials and is not advisable.
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