ISSN: 1813-0410

Keywords : Density


Production of Building Blocks Using Lightweight Crushed Waste Siporex

journal of kerbala university, Volume 13, Issue 1, Pages 139-147

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).

Thermo Physical Behavior of Binary and Ternary System's For Cyclohexanol With Some Ketones at Three Temperatures

Dhafir T. Ajeel AL-heetimi; Amar H. AL-Dujaili; Ahmed M. A. AL-Joboori; Ahmed Najem Abd; Eman Talib Kareem

journal of kerbala university, Volume 8, Issue 1, Pages 240-251

The density and viscosity of binary mixtures cyclohexanol + 2-hexanone, cyclohexanol + 2-heptanone and ternary mixture cyclohexanol + 2-hexanone + 2-heptanone have been measured over the range of temperatures (293.15K, 303.15K and 313.15K).
The excess molar volume and excess viscosity of binary systems were also calculated, and the results were fitted to a well-known Redlich-kister-type polynomial equation. As for the ternary system studied, the excess molar volume shows a positive from ideal at the three different temperatures studied. The excess viscosity shows positive deviation from the ideality at (293.15K and 303.15K) at decrease mole fraction X1, and at the temperature (313.15K) shows a positive deviation and becomes too negative deviation at increase of the mole fraction X1.