Authors

Abstract

The article presents results obtained for the thermal characterization of composite materials with clay matrix and inserts from agricultural waste (MCMLIDA). The experiments carried out led to the estimation of the coefficient of thermal conductivity of the bricks made from the MCMLIDA composite material. MCMLIDA composite materials have physical properties dependent on the parameters of the manufacturing process, one of the most important being the concentration of the insert. MCMLIDA materials were tested for eleven insert concentrations and four types of inserts (maize cobs, walnut husks, wheat straw, wool). Only the materials with the first two types of inserts had the necessary cohesion for the experiments over the entire range of concentrations (0-50%). It was found that the values of the conductivity coefficient of those materials were between 0.4 and 0.8 W/(mK), values that placed them in the area of good insulating materials from a thermal point of view. It was also observed that thermal conductivity increased (along with a decrease in insulating capacity) as the amount of insertion in the matrix was increased.

Abstract in Romanian

Articolul prezinta rezultate obtinute pentru caracterizarea termica a materialelor compozite cu matrice de lut si insertii din deseuri agricole (MCMLIDA). Experimentele efectuate au condus la estimarea coeficientului de conductivitate termică a caramizilor fabricate din materialul compozit MCMLIDA. Materialele compozite MCMLIDA au proprietati fizice dependente de parametri procesului de fabricare, unul dintre cei mai importanti fiind concentratia insertiei. Au fost testate materialele MCMLIDA pentru unsprezece concentratii ale insertii si patru tipuri de insertie (tocatura de coceni de porumb, tocatura de coji de nuca, tocatura de paie de grau, lana). Numai materialele cu primele doua tipuri de insertii au avut coeziunea necesara experimentelor pe tot intervalul de concentratii (0-50%). A fost constatat ca valorile coeficientului de conductivitate al acestor materiale sunt cuprinse intre 0.4 si 0.8 W/(mK), valori care le situeaza in zona materialelor bune izolatoare din punct de vedere termic. De asemenea, se constata cresterea conductivitatii termice (odată cu scaderea capacitatii izolatoare) pe măsură ce este sporită cantitatea de insertie in matrice.