Addition of by product from industrial seaweed waste as sand mixed material on manufacture of cellular lightweight concrete

The purpose of this study was to determine the effect of addition of by products from seaweed industry as a sand complement material on the manufacture of lightweight concrete(CLC). This research was experimental studied by making lightweight concrete CLC depends on different concentration of complement by products seaweed industry and sand (0%: 100%; 10%: 90%; 20%: 80%; 30%: 70%; 40%: 60%; 50%: 50. The lightweight concrete quality assay that used on this study was compressive strength, splitting tensile strength, density, and water absorption. The highest compressive strength of lightweight concrete by concentration 50% of addition industrial seaweed byproducts with a large 1,21 MPa. The highest splitting tensile strength was found on the addition of 50% seaweed industrial byproducts with a large 0.122 MPa. The biggest of water absorption of lightweight concrete was found on addittion 50% of industrial seaweed byproducts by 55.25%, While, the highest density was found on the addition of byproducts with a concentration 50 % by 0.87 kg/L.