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THE EFFECT OF ADDING THERMAL INSULATING GRAINS TO CONCRETE ON THERMAL CONDUCTIVITY AND COMPRESSIVE STRENGTH | ||
| AL-TAQANI | ||
| Article 1, Volume 24, Issue 2, 2011, Pages 0-0 | ||
| Abstract | ||
| The present study comprises experimental tests to determine the mechanical and thermal properties of concrete and thermal insulating material mixture. The work was carried out in two stages , at first stage five concrete blocks with dimensions of (300mm x 300 mm x 50mm) were molded containing grains of corks with volumetric percentage of insulation of (15%,20%,25%,30%,35%). Then the thermal conductivity of the specimens has been tested at different temperatures. At the same time five standard cubes with dimensions (150mm x 150mm x 150mm) have been molded from the same previous mixtures, and the compressive strength test was done for each sample. The previous work-steps have been repeated for the second stage associated with the addition of asbestos grains to concrete as insulating material instead of cork. The results of thermal conductivity were shown in curves at different temperatures and volumetric percentages, and were statistically processed using (SPSS, version 15) program, then the following relationships has been established: k = 0.555 + 0.007 Tav - 1.532 Ø (for concrete blocks which contains cork) k = 0.565 + 0.011 Tav - 1.021 Ø (for concrete blocks which contains asbestos) The values of the thermal conductivity of the blocks that contains cork were ranged between (0.22-0.65)W/m.oC, those values were less than the others which contains same percentage volume of asbestos under the same tests conditions, which ranged between (0.44-0.9)W/m.oC. The results of compressive strength of the concrete cubes have been shown as curves, it shows that the values for the specimens which contain cork were ranged between (12-32) N/mm2, which are less in values than those of the equivalent specimens which contain asbestos in which the values ranged between (25-40) N/mm2. | ||
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