Abstract: This paper investigates the thermal properties of structural lightweight aggregate concrete. Different types of concretes with four types of lightweight aggregates and several water/cement ratios were prepared. The strength classes of the produced lightweight aggregate concretes ranged from LC 16/18 a LC60/66, whereas the density classes ranged from D1.6 to D2.0. A normal weight aggregate was also used as reference. The impact of the concrete constituents on thermal conductivity, thermal diffusivity and specific heat was assessed by a modified transient test method and relations between those thermal properties and both density and water content of concrete were established. A significant exponential correlation between thermal conductivity and density of concrete was achieved. On average, thermal conductivity decreased about 0.6% per each 1% increment in aggregate porosity, 8.3% per each 50 L/m3 increment in coarse aggregate volume and 3-9% per each reduction of 1% by weight in water

• Publication Date: 11-Dec-2015
• DOI: 10.15224/978-1-63248-079-8-56
• Views: 0
• Downloads: 0

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.

• Publication Date: 11-Dec-2015
• DOI: 10.15224/978-1-63248-079-8-57
• Views: 0
• Downloads: 0