This study used pottery sand from heavy metal sludge to mitigate high shrinkage in the high-strength cementitious matrix (HSCM). which simultaneously serves as a solution to environmental concerns. The results show that both coarse and fine pottery sand can effectively reduce the autogenous shrinkage of HSCM. When the replacement rate of coarse pottery sand is 47. https://poolsproductscanadas.shop/product-category/landscape-lighting/