Material proportioning or material selection that causes a finer pore structure in the concrete will lead to greater autogenous shrinkage. For instance. a lower w/c ratio or the use of silica fume will create finer pores, as typically found in high strength concrete. The finer porosity causes the water meniscus to have a greater radius of curvature. These menisci cause a large compressive stress on the pore walls, thus having a greater autogenons shrinkage as tire paste is pulled inwards in both early age and long-term shrinkage.