Production of Building Blocks Using Lightweight Crushed Waste Siporex

Abstract

The positive impact of lightweight blocks makes it important on houses and buildings, especially in Iraq because of the severe climate while it is very hot in summer and cold in winter. Lightweight units have a good capability in acoustic insulation, thermal presence, and reduce dead loads, as well as the speed at construction work, and more economically. This research includes several concrete mixtures comprising of breaking siporex as rough aggregate and at different percentages (replacement 25% (CS-25%), replacement 50% (CS-50%), and replacement 100 % (CS-100%)) and compare those with a reference mixture which is including natural aggregate. The results shows that the compressive strength ratio of the non-loaded building units blocks are decreased than the reference mixture, i.e. the reduction are (57% ,58% ,69%) and (59% ,54% ,66%) and (59% ,51% ,66%) of the mixtures (CS-100%, CS-50%,and CS-25%), at ages of 7, 14, and 28 days, respectively. As well as, above compressive strength of loaded units decrease with (73% ,72% ,79%) and (59% ,54 % ,66%) and (59% ,51% ,71%) for the mixtures (CS-100%, CS-50%,and CS-25%) at ages of 7, 14 ,and 28 days, respectively. The dry density results are recorded at lowest value at 28 days for the mix CS-100%, i.e. 1287 kgm3, while the lowest result of the absorption was found in the mixture CS-25% is 4.38%. At age 28 days the lowest results of the thermal conductivity were lowest results was recorded for the mixture CS-100% i.e. (0.359 W/m.K).