(Physical-mechanical properties evaluation of mortar using foundry scrap)

Abstract

The daily large volume of solid waste generated by industries has caused great harm to the environment, due to the incorrect destination, human negligence and the large areas occupied for disposal. The present work aimed to develop a study for the production of mortar mixture to be used in construction, by using foundry scrap such as slag from induction furnaces and calcined core sand, with the addition of poly (vinyl chloride) resin powder (PVC) NORVIC P72HA and a liquid plasticizer additive (Sulfonol NSDC) in the concrete mass composition which intention is to reduce water absorption of the material and improve their physical and mechanical properties. Fiftys amples have been made of concrete mass, in which ten of those samples were made of traditional concrete mass and forty of defined compositions. Samples were submitted to physical essays of water absorption (AA), apparent porosity (AP) and apparent gravity (AG) and to mechanical essays of ultimate compression strength (UCS). According to the results obtained, it can be seen that results in mortar proposed composition presented 30% less water absorption and 31% less apparent porosity. Results of mechanical essays were in accordance with the specifications of Brazilian standard NBR 8953¹, because even without the addition of gravel in its composition the alternative compositions showed similar properties to concrete strength of C20 group I, to be used in construction. However, due to the high cost of resin poly (vinyl chloride) (PVC) P72HA NORVIC, their production has not yet become attractive. It is recommended, in order to enable the use of resin, to do a research to see what the lowest proportion of addition of the same that is capable of reproducing the results of physical-mechanical properties recommended in the literature.

Keywords:
industrial solid waste; concrete; recycling