Abstract: “This paper aims to characterize the compressive behavior and structural efficiency of structural lightweight aggregate concrete (SLWAC) produced with different types of lightweight aggregates (LWA). To this end, a comprehensive experimental study was carried out on different concrete compositions with strength classes from LC12/13 to LC55/60 and density classes from D1.6 to D2.0, involving all possible failure modes. The mechanical behavior is characterized by means of the concepts of limit strength, ceiling strength and strength of the aggregate in concrete. High correlations are found between experimental and design values based on a biphasic model to estimate the strength of SLWAC. Covering the most common types of LWA, expressions are suggested to estimate the strength of the aggregate in the concrete.”

Keywords: Structural Lightweigh aggregate concrete, compressive strength, structural efficiency, limit strength