Thermal and constructional behavior of light concrete block using many crushed materials as aggregate with economic analysis

Abstract

The riverine aggregate have high mass density (2700Kg/m3) and thermal conductivity (2.8W/m.c0) this reflects the properties of the block concrete in order to decrease these properties , the riverine aggregate must be replaced by any materials have low density and thermal conductivity such as : scrap brick , lime stone , or black stone (pumice). In this paper, block concrete samples (solid and hollow), with dimensions of (200x200x200mm) , were constructed mixing ratio of (4:2:1)by mass and water percentage of 0.5 were used . The thermal and constructional behavior of these blacks was investigated at Baghdad climate zone during one year at 21th day of each month for 15 hr/day. The test results showed that, using pumice racks as aggregate reduced the density by about 44% and increased the energy saving by about 34%. However, this enhancing in the properties was accompanied with reduction in the tensile and compression stresses of unloaded walls. Using limestone as aggregate gave 20% reduction in density with 5% increase in the energy saving 60% reduction in density and 40% increase in the energy saving were achieved when using gypsum block with fiber glass layers.