About the authors
| First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address. | Naumov A.A. – researcher E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Yundin A.N. – candidate of technical sciences, professor E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Rostov State Building University The organization address: 344022, Russia, Rostov-on-Don, Sozialisticheskaya st., 162 |
| Title of the article | Dilatometric characteristics at freezing of water-saturated modified ceramic crock |
| Abstract. | In article the results of the low-temperature dilatometric researches confirming positive effect of the modifying additive on frost resistance of ceramic samples are presented. As such additive used the carbonate calcium waste which is forming by production of mineral ferlizers. Dilatometric researches carried out on the samples of semidry pressing made of fusible raw materials of the Sultan-Salynsky field as in pure form, and with 5 % of a mineral additive. Studied behavior of water saturated samples at numerous cycles of freezing and thawing, and also influence on dilatometric characteristics of extent of water saturation and roasting temperature. It is established that with each cycle of freezing relative lengthening of not modified samples increased: on the first cycle it made 36•10-5; on the second – 40•10-5 and on the third – 48•10-5. It is also accumulated residual deformations of the samples after thawing. Samples with a modifying additive are characterized by an invariance of extent of lengthening of samples at repeated cycles of freezing. Full relative lengthening of samples is 15•10-5 in the absence of residual deformation. This may testify to the absence of cracks in the structure of the samples with the additive. It is defined that various extent of water saturation makes essential impact on residual lengthening of samples when freezing. At increase in extent of water saturation increases both relative, and residual lengthening. At the modified samples full relative lengthening decreases in 1,5-2,4 times in comparison with samples without an additive, and residual lengthening is noted only at samples at water saturation by way of boiling. At roasting temperature increase with 950 to 10500С relative lengthening at samples of not modified crock decreases with 56•10-5 to 28•10-5. At samples with an additive relative lengthening roasting temperature increase also decreases with 22•10-5 to 10•10-5. Raising the temperature of roasting also allows you to reduce the amount of the residual deformation after thawing of the samples. By the executed researches it is established that the modifying additive promotes reduction or full elimination of residual lengthening of samples after thawing. It can indirectly testify to reduction of tensile stresses in the solid of product at formation of ice therefore frost resistance of the modified crock increases at 11-12 times. |
| Keywords. | Dilatometric effect, residual lengthening, ceramic crock, mineral additive, frost resistance. |
| For citations: | Naumov A.A., Yundin A.N. Dilatometric characteristics at freezing of water-saturated modified ceramic crock // Izvestiya KGASU. 2012. №4(22) P.319-325. |
