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Type of publication: Straipsnis kitose duomenų bazėse / Article in other databases (S4)
Field of Science: Aplinkos inžinerija / Environmental engineering (T004)
Author(s): Kasperiūnaitė, Dalia;Mikuckis, Feliksas;Navickas, Juozas
Title: Nedegto molio bandinių termofizikinės savybės
Is part of: Vagos. , Nr. 82 (35) (2009)
Extent: p. 94-101
Date: 2009
Keywords: Molio tankis;Šilumos laidis;Absorbcija;Density of clay;Heat conductivity;Absorption capacity
Abstract: Nedegtas molis gali buti naudojamas kaip statybin medžiaga ukiniu pastatu ir netgi gyvenamuju namu statybai. Tai ypac aktualu kaimo vietov se, nes tokiu budu taupoma energija, did ja vietiniu gyventoju užimtumas ir sumaž ja statybos kainos. Ištirta nedegto molio bandiniu tankio priklausomyb nuo ju gamybos technologijos: presavimo sl gio ir formavimo mas s absoliutinio dr gnio, nedegto molio bandiniu šilumos laidžio ir vandens garu absorbcijos gebos priklausomybe nuo formavimo mas s absoliutinio dr gnio juos slegiant 40 MPa sl giu; taip pat šilumos laidžio priklausomyb nuo bandiniu absoliutinio dr gnio šilumos laidžio matavimo metu. Taikant tiesine regresija, atliktas šilumos laidžio prognozavimas pagal nedegto molio bandiniu formavimo mas s ir šiu bandiniu absoliutini dr gni. Nustatytas bandiniu formavimo mas s ir bandiniu absoliutiniu dr gniu reikšmingumas šilumos laidžiui
The dependence of the density of unbent clay samples on the technology of their production – extruding pressure and absolute humidity of forming mass – has been investigated in the article. The article also deals with the problems of the dependence of samples pressed using 40 MPa, extruding pressure and water vapour absorption capability on the absolute humidity of samples forming mass, as well as the dependence of heat conductivity of the samples on the absolute humidity of these samples during the period of the investigation. It has been established that when the humidity of forming mass increases, the density of samples also grows, reaches maximum and then declines. When extruding pressure increases, density reaches maximum the humidity of forming mass being smaller. When samples are dried the maximum of density is observed at lessened humidity of forming mass. Heat conductivity also depends on the humidity of forming mass because the density of samples, and, in our opinion, the form of pores depends on this parameter. When absolute humidity of samples increases heat conductivity also increases. When extruding pressure is 40 MPa, heat conductivity depends on the humidity of forming mass, absolute humidity of samples being the same. This dependence is not linear. Heat conductivity of dry samples increases, reaches maximum and lessens. When extruding pressure is constant and absolute humidity of forming mass changes, the coefficient of friction immovability changes too. Therefore clay particles transfer from the state of larger potential energy to less one saltatorily. The following model of heat transfer is being proposed: the main principle in heat transfer is heat transmission from one particle to another, vapour heat transmission and water vapour diffusion
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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