The influence of the binder and volcanic rocks in natural-organic building materials

The building industry needs to implement a new construction system, based on maintaining the balance between the existing natural ecosystems due to its negative impact in the last years on the natural resources. The study started from rethinking the way in which traditional building materials influence the environment and how these can help reduce the pollution of the building sector. Therefore, the research was based on the study of waste raw materials from agricultural sector with different natural binders. The experimental program contains six recipes, in which the main element is hemp hurd, produced in our country. Besides this technical plant, the formulas contain volcanic rocks that help the materials to have a lower density and to improve the fire properties. The natural binders used in the formulas had also an important role for developing the natural-organic materials. On the recipes obtained, three parameters are studied: sound absorption coefficient, thermal conductivity and mechanical resistances. The results were influenced by the composition of the materials. The use of raw waste materials and the multicriterial analysis will concern the products on the list of sustainable building materials, because the purpose of the research is to help the construction industry to reduce its negative impact on the environment.