Abstract
The residual compressive strength of eight lightweight concrete mixtures containing three commercial grading (Liapor HD 5 N, Liapor HD 7 N, and Liapor 8F) of coarse lightweight aggregate (LWA) were determined after to expose at high temperatures. Eight mixes were produced, two by normal weight aggregate and the rest by different types of LWA. The produced concrete was analyzed after high temperature exposure and the effect of using LWA, the type of LWA, and compaction method was studied. To do so, visual inspection, residual compressive strength, crack pattern, spalling, and thermoanalytical analysis were conducted. Generally, it could be concluded that concrete formulations with LWA behave more advantageous up to 500 °C, compared to those with quartz gravel aggregates. Moreover, this study found that an ideal type of LWA to produce structural concrete was Liapor HD 5 N, which was used for producing the mixes L1 and L3.
Highlights
The risk of concrete surfaces spalling is significantly higher in case of lightweight aggregate concrete (LWAC) structures compared to the conventional normal weight aggregate concrete (NWAC) structures
Specimens made with Liapor HD 5 N aggregate discolored after exposed to 800 °C heat load (Fig. 7), no discoloration was observed at lower temperatures
This study aims to assess the residual compressive strength of the load-bearing lightweight concrete (LC16/18-LC40/44) after heat load in case of using different expanded clay aggregates
Summary
Introduction and literature reviewThe risk of concrete surfaces spalling is significantly higher in case of lightweight aggregate concrete (LWAC) structures compared to the conventional normal weight aggregate concrete (NWAC) structures. High temperature load design is required in the case of LWAC, where the knowledge and selection of the appropriate aggregate and its behavior are crucial. Changes to the strength characteristics of concrete under the impact of high temperature are largely determined by the type of aggregate used [6, 7]. Where the internal structure of the aggregate and the aggregate surface (different contact zones between aggregate and cement matrix) influence the behavior of concrete after exposure to high temperature. In the case of LWAC, it has been suggested to use polypropylene fibers to avoid spalling of concrete cover [6]
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