Abstract
In the last years, an increase of coffee beverages consumption has been observed all over the world; and its consumption increases the waste coffee grounds which will become an environmental problems. Recycling of this waste to produce new materials like sand concrete appears as one of the best solutions for reduces the problem of pollution. This work aims to study the possibility of recycling waste coffee grounds (Spent Coffee Grounds (SCG)) as a fine aggregate by replacing the sand in the manufacturing of dune sand concrete. For this; sand concrete mixes were prepared with substitution of sand with the spent coffee grounds waste at different percentage (0%, 5%, 10%, 15% and 20% by volume of the sand) in order to study the influence of this wastes on physical (Workability, bulk density and porosity), mechanical (compressive and flexural strength) and Thermal (Thermal conductivity and thermal diffusivity) properties of dune sand concrete. The results showed that the use of spent coffee grounds waste as partial replacement of natural sand contributes to reduce workability, bulk density and mechanical strength of sand concrete mixes with an increase on its porosity. However, the thermal characteristics are improved and especially for a level of 15% and 20% of substitution. So, it is possible to obtain an insulating material which can be used in the various types of structural components. This study ensures that reusing of waste coffee grounds in dune sand concrete gives a positive approach to reduce the cost of materials and solve some environmental problems.
Highlights
The fraction of organic waste in household wastes is large and increases with time
In order to limit the number of compositions and to be able to compare them in hardened state on a common basis, it has been decided to carry out the research project at a constant workability and adjusting the workability measure by adding the a quantity of plasticizer for each mixture contains coffee waste
The results showed that the use of spent coffee grounds as partial replacement of naturel sand contributes to reduce the bulk density of dune sand concrete for about of 13%
Summary
In each country the waste composition is different, since it is affected by socioeconomic characteristics, consumption patterns and waste management programs, but generally the level of organic in waste components is high. Among these wastes is a coffee waste. Several works has already been done on the use of coffee waste as an aggregate in the preparation of cement mortar [4], concrete [5, 6] and Eco-fired clay bricks [7] The authors in this works explored the use of light aggregate based on coffee waste, as a composite material reducing the workability, density, the cost, the brittleness, the thermal insulation properties and fire of building materials such as concrete, mortars or bricks. The lack of adhesion between the grain of spent coffee grounds and cement paste and the inhibition of cement hydration due to the cellular nature of SCG are the reasons indicated in several studies for the poor mechanical properties of concrete containing SCG [4]
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