How Do You Cast Concrete From Sand Molds?
Sand casting concrete is an easy way to create outdoor ovens, fountains, planters or other projects. When casting concrete from sand molds, work on a dry, temperate day: rain or humidity will slow your drying and curing time. The basic principle of sand casting is that the sand acts as a mold for your concrete; the sand can be shaped into a pattern or the sand can be built into a dome, with a decorative mold, such as a leaf, placed on top of the sand dome. Allow the cast concrete to cure for at least one week before using. Moisten the sand with water so that it becomes sticky. Pile the sand into a large dome or other shape, depending on your project. The sand should stick together and hold its shape. If it slumps down, your sand is too wet and you should add more dry sand. If the sand cannot hold a shape, it’s too dry. Continue piling the sand until you have the form you want. Smooth down the outside of your sand dome by running a flat spade over its contours. Remove any air bubbles or
