Mechanical properties of lime-cement concrete incorporating waste and recycled materials

Lime and lime-cement concretes are non-structural concretes in which lime is utilized as the main binder. These types of concretes have been widely used by geotechnical engineers under shallow foundations in many warm regions around the world. The increasing attention to environmental challenges has encouraged researchers to reuse wastes and recycled materials in such traditional concretes to improve their engineering properties and alleviate the environmental concerns. In the present study, the effect of some waste and recycled materials such as glass powder, tire powder, fly ash, and wood ash on the compressive strength, elastic modulus, and stress-strain behaviors of lime-cement concrete was studied. According to the test results and previous studies, the optimum values of raw materials were used to prepare lime-cement concrete specimens. After curing the specimens, uniaxial compressive strength test was carried out on specimens. According to the test results, the maximum compressive strength and the highest ductility were observed in lime-cement-fly ash and lime-cement-tire powder concretes, respectively. Lime-cement concrete containing tire powder had the highest failure strain and the lowest secant modulus. The lowest failure strain and the highest secant modulus were observed in lime-cement concrete containing fly ash, and this concrete showed a more brittle behavior.

Keywords:

Industrial wastes , recycled materials , fly ash , wood ash , glass powder , cement , tire powder , lime-cement concrete