Valorization of seashell by-products in pervious concrete pavers

摘要

Seashell By-Products (SBP) are produced in an important quantity in France and are considered as waste. This paper studies their use as a partial replacement of aggregates in pervious concrete pavers considered as an environmentally friendly building material. After designing the control pervious concrete pavers by investigating the energy and the pressure compaction, the coarse aggregate fraction were partially (20% or 40% by mass) replaced by SBP obtained from the Crepidula shell. The crushed Crepidula seashell of 2/ 4 mm and 4/6.3 mm were used to make new seashell by-products based pavers. In this paper, the mechanical and hydrologic properties of both pervious concrete pavers were determined. Results show that the seashell by-products have the potential to be used as aggregate. The mix design allows achieving both a compressive strength of 16 and 15 MPa for respectively the control pervious concrete pavers and the seashell by-products based pavers and a permeability coefficient in the range of 3-8 mm s~(-1).