Thermal insulation is one of the main problems facing the engineers working in
building and housing sector spatially for the high summer temperature in the most
Arab Gulf and spatially in Iraq, so the study of lightweight aggregate thermal
insulation (No fine concrete) is important. The experimental work consist of concrete
mixes (cement: porcelinite aggregate) ratios (1:4), (1:5) and (1:6) and for each mixes
cement content changes (200, 300 and 400) Kg/m3. Dependence on mixing (1:5) and
cement content (300Kg/m3) change the water to cement ratio (0.4, 0.45 and 0.5) by
weight. The research presents the tests of density, absorption, porosity, ultrasonic
pulse velocity, accelerated compressive strength according to British standard (BS
1881: Part 112: 1983), normal compressive strength at 7, 28 and 90-day. Light weight
concrete was obtained of density ranging from (721-770) kg/m3 and thermal
conductivity ranging from (0.17- 0.24) W/ (m.K). The good correlation between
accelerated compressive strength at one day with normal compressive strength at 28-
day is approximately (0.245 ±0.005) for water bath at 55°C and (0.335±0.05) for
water bath at 82°C.