Study of the physical and mechanical properties of green flowable sand concrete based on waste foundry sand as fine aggregate
Mohamed Guendouz, Djamila Boukhelkhal, Moussa Hadjadj, Loubna Benatallah
Abstract
The amount of industrial waste in household waste is significant and increasing over time. Due to their lifespan, these wastes currently constitute a major concern, requiring management from an economic, social or environmental point of view. With a focus on environmental preservation as a key goal, the sector of civil engineering has shifted towards sustainable development. Among the various landfilled industrial wastes, we distinguish the waste foundry sand (WFS) that is generated in large quantities. This work aims to study the recycling of foundry sand waste (WFS) as fine aggregate in the manufacturing of flowable sand concrete (FSC). For this, the sand is substituted with the WFS at dosages of 0%, 3%, 5%, 8%, and 10%. The influence of this waste on the fresh properties, such as slump flow, bulk density, and hardened properties such as compressive strength and water absorption by capillary of FSC, was studied, analysed, and compared with control flowable sand concretes. The results obtained show that the FSC made with WFS has some better mechanical characteristics and less absorption than conventional concrete. Additionally, this study ensures that recycling these wastes in FSC provides a beneficial way to save material costs and address some environmental issues, as well as obtain a new material that allows for use in the various types of structural components.