Short-Term and Rheological Properties of Lightweight Concrete with Sintered Aggregate

The aim of this paper is to determine the short-term and long-term mechanical properties of lightweight concrete with sintered aggregate. The ecological aggregate comes from recycling ashes from power plants, which yield granules after processing. The research was planned based on two concrete mixes. A series of strength and rheological tests was carried out in the Building Structures, Geotechnics and Concrete Laboratory of the Building Research Institute (ITB). As a result of these tests, the following parameters were determined: secant modulus of elasticity and cylindrical strength of concrete, cubic strength of concrete, axial tensile strength, tensile strength at splitting, flexural strength and concrete strains due to creep and shrinkage. An unusual process of development of the modulus of elasticity was observed. Despite this, floor slabs designed from the discussed concrete show slight deflections compared to slabs made of plain concrete. It turns out that the current standard models correctly approximate the results of rheological tests in the case under consideration. Knowledge of the tested parameters is necessary when designing prestressed structures and adopting proven values for static calculations when designing complex structures, including prestressed elements made of discussed lightweight concrete with sintered aggregate.