Narges Dehkhahari Monfared* and Alirezarashnou
Nowadays, the use of light weight and yet resistant materials has a special place in the construction industry. Lightweight concrete is one of the materials that have been widely used in the construction industry due to its light weight, easier transportation and reduced production costs. Recently, the huge and extensive developments in concrete technology have been able to make significant progress in the concrete production industry by using new methods. The use of bacteria is considered a new and effective strategy in the concrete manufacturing industry. In this study, the role of calcite deposits on the compressive strength of lightweight concrete is investigated, before and after heat treatment of 150, 300, 450, 600 degrees celsius. The results obtained after examining the samples that were processed for 28 days in water and water containing calcium chloride and urea showed that the compressive strength of all samples decreased after being exposed to saturated heat. In addition, the presence of bacteria in the samples before the application of heat caused an increase. There is a significant increase in the compressive strength, and after the application of heat, the compressive strength of samples containing bacteria has a lower decreasing trend than the samples without bacteria, which indicates the positive effect of bacteria on the compressive strength of concrete even after applying heat.
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