Rammed Earth with 0.25% Straw

This rammed earth sample contains 0.25% straw and was tested for water repellence. 15 ml of water is sprayed on the sample's surface four times. The first spray happened two weeks after ramming, and was sprayed three more times at four day intervals. It was observed that the water affects the surface condition but the sample is much more water resistant than the raw rammed earth.