Experimental analysis of the effect of lime addition on the properties of clay bricks (a thermomechanical study)

The purpose of adding lime to clay bricks is to develop and improve their mechanical, physical, and chemical properties. Lime reduces shrinkage upon drying, thus reducing cracking. Furthermore, it improves the brick's resistance to compression and shape retention, increasing its long-term durability. In this context, tests were conducted on clay bricks with lime contents ranging from 5% to 30% at the University of Djelfa's research facility. A consistent increase in density was observed up to 15% lime. Lime also reduced water retention from 17% to 10%, thereby reducing the brick's vulnerability to moisture. Mechanically, compressive strength increased by 26%. Regarding the thermal aspect, thermal conductivity decreased between 5.71% and 30.28%. The results showed that a 15% lime rate is ideal for achieving a balance between durability and thermal insulation. In the field, lime may be a promising natural and economical option, contributing to reducing carbon emissions and construction costs while improving the maintainability of local assets.