How much cement was used to build the Washington monument?
The Monument is built of free-standing masonry which means there is no cement holding the blocks together. According to the Washington Post, "the obelisk is basically dry set: The marble blocks are held together by gravity and friction, not mortar. There is mortar, but it just serves as weatherstripping, not glue, said the National Park Service’s Carol Johnson. It’s like a huge Jenga tower.”